FAQ
Getting some emi from a high compression/twin turbo/blown 454 I am currently having blueprinted, which for some reason seems to be affecting some of my equipment?
I am doing an emc shielding experiment with a pocked radio for some fun over the weekend to try and fix. Wondering if anyone can suggest any other options to try to shield the emf?
I am going to try;
- sheet copper
- A $10, 1 foot square of craft copper (which has been moulded with a wooden milliners head), may need to allow my radio to breath occasionally on a hot day and place next to a chilly glass of water..*-
- mumetal
- 30m roll of aluminium foil (discount brand) (both electicity and magnetic)*-
- black steel (for both magnetic and electricity)
- rubber - silicone/neoprene/latex etc. (for sub 100khz)*-
- hollow ear from a big pair of padded headphones
- a tiny offcut of superconducting material (apparently does magnetism somehow as well as electricity)
- a variety of specs of some industry quality light/flexible layered dialectric sheeting like silicone/kapton etc (which are licenced by law for public release).*-
- an industrial polymer resin designed for shielding
- a fine layer of water in the base of a broad flat tray.
- A piece of cheap light sports fiber material.
- an antistatic polymer like sail mylar, or PET plastic.
- a high dialectric constant - thin film sheet (like emi tinting)
- CR-39 polymer from a construction eyeglass lens, hopefully to cease the static.
- A preprepaired impregnated cardboard box... (plus possibly a couple of tiny metal and resin samples etc)... Only for those who are serious :]
Careful to sand every metal edges with course sandpaper and cork block to avoid dangerous edges and corners (shielding metal is very dangerous and sharp and could potentially do very serious, major dammage). Also applying plastic adhesive sheet to the face of the metal where needed to avoid dangerous metalic dust (can buy this quite cheeply if you look around) NEVER SAND ANYTHING WITH guide ADDED!!! - like an alloy or metal smeltered with guide - instead snip corners with tin scissors and heavily tape edges with cheep broad tape.
9 Aug 2009, 11:59 am | click here to read more
I am looking to put roller hockey flooring (also know as high impact polypropylene co-polymer plastic) in my room but every where I look only sells it in to big of an amount for my room and I am wondering if anyone knew where I could receive it to fit my room and for a reasonable price?
8 Jan 2010, 11:47 pm | click here to read more
Would a Polymer dish about an inch thick cease a .308 Winchester (7.62x51mm) or anything bigger. If so, could you make vehicle armor from styrofoam, Polymer, Plastics, and Aluminium.
Idea is that the Aluminium is a base and backing while the styrofoam is a spacer along with the plastic and the poymer is the outer layer to take most of the hit and glance it off.
6 Mar 2010, 9:45 am | click here to read more
Would Aluminium, Polymer, Plastic, Fiber Glass, and Styrofoam together in various ways make good armor against HEAT Rounds, DP NATO Rounds, and RPGs?
Squeelgologist, Thanks, but the idea is that I'm developing a spare-time paper-project that is a tank design/concept to complement the M1 Abrams and before you call those nice young men in there clean white suits to take me away t the laughing home, stranger thing have happened; heck an aerodynamics engineer with no military background, from California no less, designed the M16. So I figure, why can't a straight A teenager like me at least design the tank. I probably will never build it but hey I gave it a shot. The concpet calls for very little cost and weight along with fair protection and armorment.
6 Mar 2010, 11:03 am | click here to read more
i'm going to make christmas ornaments from my tree out of polymer clay.....like the glass balls you receive at the store. but i have a few problems.
i can't make them solid, that's WAY to heavy to stay on the tree, and it's too much clay as well.
i could coat already made cristmas balls in clay, but i'm worried the glass ones will explode from the heat in the oven, and the plastic ones will melt.
so how can i make perfect hollow spheres? maybe something similar to paper machete where you mold it around the balloon, but i'd probably pop the balloon while i'm molding it.
if i can manage to make a perfect circle paper machete ball, and coat it with clay, will it crack, explode, or catch on flame from the heat? keep in mind there would be a hole at the top for the metal thing to go......
4 Dec 2009, 8:40 pm | click here to read more
The source of starting materials for synthetic polymers is primarily
a. recycled plastics.
b. plants.
c. coal and petroleum.
d. animals.
31 Jul 2009, 4:38 pm | click here to read more
The polymer (ABS plastic) consists of three monomer units: acrylonitrile (C3H3N), butadiene (C4H6), and styrene (C8H8).
(a) A sample of ABS plastic contains 8.80% N by mass. It took 0.605 g of Br2 to react completely with a 1.20 g sample of ABS plastic. Bromine reacts 1:1 (by moles) with the butadiene molecules in the polymer and nothing else. What is the percent by mass of acrylonitrile and butadiene in this polymer?
(b) What are the relative numbers of each of the monomer units in this polymer?
30 Jun 2009, 3:00 am | click here to read more
Chemistry A Silver-Cleaning Battery
Chemistry A Soluble Separation Solution
Chemistry Analyze This! Make a Colorimeter to Measure the Concentration of Blue Dye in Various Liquids.
Chemistry Are Enzymes in Laundry Detergents Effective Stain Removers?
Chemistry Balloon Morphing: How Gases Contract and Expand
Chemistry Big Pieces or tiny Pieces: Which React Faster?
Chemistry Bouncy Polymer Chemistry
Chemistry Boyle's Law: Pressure vs. Volume of a Gas at Constant Temperature
Chemistry Bring on the Heat! Investigating Exothermic Reaction Rates
Chemistry Bubble-ology
Chemistry Build a 'Breath Spray Bomb' to Study Chemistry and Physics of a tiny Explosion
Chemistry Cabbage Chemistry
Chemistry Can You Change the Rate of a Chemical Reaction by Changing the Particle Size of the Reactants?
Chemistry Charles's Law: Volume vs. Temperature of a Gas at Constant Pressure
Chemistry icy Pack Chemistry: Where Does the Heat Go?
Chemistry Colorful Chemistry Creations: Make Your possess Sun Print with Color and Sunlight!
Chemistry Crazy Crystal Creations: How to Grow the Best and the Largest Crystals
Chemistry Crime Scene Chemistry—The chilly Blue Light of Luminol
Chemistry Do Oranges Lose or Gain Vitamin C After Being Picked?
Chemistry Electrolyte Challenge: Orange Juice vs. Sports Drink
Chemistry receive the guide Out: Explore the Effects of pH on guide Testing.
Chemistry How Do You receive Heat from a Supercooled Solution? Explore the Chemistry Within Hand Warmers
Chemistry How quick Does an Alka-Seltzer® Tablet Make Gas?
Chemistry How to Make the Boldest, Brightest Tie-Dye!
Chemistry Just Keep chilly—How Evaporation Affects Heating and Cooling
Chemistry Keep Your Candy chilly With the Power of Evaporation!
Chemistry Make Your possess Markers
Chemistry Make Your possess pH Paper
Chemistry Measure Luminescence in Glow-in-the-Dark Objects
Chemistry Measuring Enzyme Activity: Yeast Catalase
Chemistry Measuring Surface Tension of Water with a Penny
Chemistry Measuring the Amount of Acid in Vinegar by Titration with an Indicator Solution
Chemistry More Solubility Ideas
Chemistry Ooze: A Cornstarch Colloid
Chemistry Paper Chromatography: Advanced Version 1
Chemistry Paper Chromatography: Advanced Version 2
Chemistry Paper Chromatography: Basic Version
Chemistry Plastic Deformation: Glass Transition of Some Plastics
Chemistry Plop, Plop, Fizz quick: The Effect of Temperature on Reaction Time
Chemistry Polymer Absorbance: A Swell Project
Chemistry Polymer Permeability: Which Plastic Wrap Prevents Evaporation Best?
Chemistry Polymer Permeability: Which Plastic Wrap Prevents Oxidation Best?
Chemistry Potions and Lotions: Lessons in Cosmetic Chemistry
Chemistry Race Your Marbles to Discover a Liquid's Viscosity
Chemistry Rocketology: Baking Soda + Vinegar = Lift Off!
Chemistry Rusting Out: How Acids Affect the Rate of Corrosion
Chemistry Salt Oscillator
Chemistry Saturated Solutions: Measuring Solubility
Chemistry Saturated Solutions: Measuring Solubility
Chemistry Spaces Between Water Molecules: When 1 + 1 < 2
Chemistry Study Chirality with a Homemade Polarimeter
Chemistry The Chemistry of Hair Highlights
Chemistry What Makes Ice Melt Fastest?
Chemistry What's the Point of Boiling?
Chemistry Which Orange Juice Has the Most Vitamin C?
30 Dec 2009, 10:47 am | click here to read more
I need someone to provide me with the exact brand and model of snow shovel that would be proper for shoveling a driveway. I do not want a piece of crap plastic blade excuse for a shovel. Now, if the blade is "polymer" or something and you know it is tough then that's ok.
How much can I charge to shovel and salt the whole driveway, apron, sidewalk, and porch with an average size driveway and snowfall (about 6"). How much would you pay? Would you be a repeat customer if I did the job properly? Thanks.
3 Nov 2009, 11:14 pm | click here to read more
current life relies on a assortment of plastic polymers....
-What do we normally call Poly(ethene) and Poly(chloroethene)
-What is the difference between plasticised & unplacticised poly(chloroethene)
in their chemical structure and the ways they are used?
Thanks so much if you can help me ><
3 Feb 2010, 5:32 pm | click here to read more
i need help with these science questions. i've looked them up in my textbook (we're allowed to) and i STILL cant find them. please help!
1. what property of radioactive isotopes allows them to be used to determine the age of rocks and fossils?
2. No other element can form the amount and variety of molecules that carbon can form. What characterstics does carbon hace that explain this characteristic?
3. Plastics are synthetic, organic polymers. How are plastics similar to polysaccharides? HOw are they different?
4.How are these words related?
catalyst, enzyme, activation energy, substrate
5. How are these words related?
reactant, product, chemical reaction, catalyst
6. Most enzymes in the human body work best at 37 degrees C. Imagine scientists have discovered an enzyme in the body that works best at 39 degrees C. What processes or functions might this enzyme be involved in.
PLEASE HELP! even if you can't tell me every the answers!
29 Sep 2009, 3:41 pm | click here to read more
True or untrue:
1.Seamless plastic or rubber parts on food service equipment is important to prevent cracking or splitting over extended use.
2.Most equipment manufacturers voluntarily submit their designs to NSF for certification to show that they are suitable for use in professional food service operations.
3. Induction burners are portable and favorable because they maintain a safer and cooler cooking environment, however, will not likely become a regular part of the commercial kitchen.
4. While pans lined with a polymer such as Silverstone or Teflon provide a slippery, nonreactive finish that keeps food from sticking, and thus enables the cook to use less fat in the cooking process, the great deal of care required to keep this coating from chipping, scratching or peeling may not make it an appropriate pan to have in a commercial kitchen.
5. A steam kettle cooks more slowly than a pot sitting on a stove.
The questions are every True and untrue and need help finding out if these are the right answers.
My answers:
1.T
2.T
3.F
4.F
5.T
29 Jan 2010, 3:38 pm | click here to read more
I'm looking for an ak-47/ak-74 that is cheap. It needs to be high quality barrel/gearbox made from ABS plastic, metal, or polymer. I would like it to weigh 3-6 pounds and be in the price range of $80-$120.
29 Aug 2009, 7:29 pm | click here to read more
Should I be concerned because the frame is made of a polymer material. I use to be a machinist and still have a bias against plastic.
28 Sep 2009, 7:05 pm | click here to read more
i m polymer engg student so i've some doubt that i wanna clear....pls explain my question's ans with easiest way......
28 Oct 2009, 10:36 am | click here to read more
A compound has an empirical formula of CH2. Its molecular formula could be
a. CH2
b. C2H4
c. C4H8
d. any of the over
The chemical formula for calcium chloride is
a. CaCl
b. CaCl2
c. Ca2Cl
d. Ca2Cl2
The empirical formula of a molecule
a. can be used to identify the molecule.
b. is sometimes the same as the molecular formula for the molecule.
c. is used to name the molecule.
d. shows how atoms bond in the molecule.
every organic compounds
a. arrive only from living organisms.
b. contain only carbon and hydrogen.
c. are biochemical compounds.
d. have atoms connected by covalent bonds.
Which group is not a polymer?
a. amino acids
b. carbohydrates
c. proteins
d. plastics
28 Nov 2009, 4:32 am | click here to read more
1) In the production of printed circuit boards for the electronics industry, a 0.600 mm layer of copper is laminated onto an insulating plastic board. Next, a circuit pattern made of a chemically resistant polymer is printed on the board. The unwanted copper is removed by chemical etching and the protective polymer is finally removed by solvents. One etching reaction is the following.
Cu(NH3)4Cl2(aq) + 4 NH3(aq) + Cu(s) 2 Cu(NH3)4Cl(aq)
A plant needs to manufacture 10,000 printed circuits boards, each 8.8 multiplied by 16.0 cm in area. An average of 75% of the copper is removed from each board (density of copper = 8.96 g/cm3). What masses of Cu(NH3)4Cl2 and NH3 are needed to do this? Assume 100% yield.
2) Consider the following reaction.
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g)
If a container were to have 15 molecules of O2 and 15 molecules of NH3 initially, how many total molecules (reactants plus products) would be gift in the container after this reaction goes to completion?
27 Jan 2010, 12:39 pm | click here to read more
1. During the preparation of nylon, the beaker contained two layers, one aqueous solution and one cyclohexane solution. Why are there two layers ? Explain and rationalise the composition of the two layers.
2. Why was a diacid chloride used rather than a dicarboxylic acid for the preparation of nylon ? What are the problems with trying to use the dicarboxylic acid ?
3. Esters (including polyesters) can be made using the acid catalysed reaction of carboxylic acids and alcohols. Draw the curly arrow mechanism for this reaction by showing how ethanoic acid and ethanol react to give ethyl ethanoate.
27 Jan 2010, 10:25 pm | click here to read more
what a cheap and easy to geta hold of polymer/ plastic thats light and impact resistant. and possibly easy to shape?
ok i sorta understood what you were saying but a clear answer would be nice and a place where i could by this at
27 Aug 2009, 3:40 am | click here to read more
I'm making my first Yorkshire terrier fur suit for school . but i've thought of polymer clay for the teeth..but i don't know what material..i don't want it to be too expensive or anything, i have no idea how to receive the gum..for the mouth and so.. like the frame.. some plastic? frame? i know how to do the moving jaw trick, i've already made the tail. from using the back of a furry hood, and i put a metal hanger inside of it. to put it in the pose. Thanks (:
UK only please?
26 Feb 2010, 3:18 pm | click here to read more
I got some Mighty Putty recently and it was just...well....bad. Let me explain, I have used Mighty Putty brand epoxy before and loved it. I use it for my sculptures I do with polymer clay. I ordered some more putty because my supplies began to run low and there is something wrong with it. Instead of a normally white middle with the same consistency as the green around it, its grey and sticky. The green outside is difficult as if it has cured already and it gives off a strong chemical odor, almost identical to the odor of someone receiving a perm. It doesn't mix evenly and is blue/green in color as opposed to off white. The sticks I used previously where taller than these, and came in simple plastic tubes. The containers are more intricate now and the sticks of epoxy are much shorter. Has this happened to anyone else? What do you think happened to it? Has it gone bad or went through some sort of chemical reaction? every help is appreciated! ^^
24 Sep 2009, 2:46 am | click here to read more
Wikipedia's entry on "plastic" says "Synthetic rubbers are not plastics", however looking at the circumstances (Synthetic rubber has its possess section in the plastic article; the claim is just a one-liner that contradicts the relax of the section; fact that synthetic rubber is hydrocarbon-based polymer; etc), it appears that that statement is fishy. We know Wikipedia can be a bit unreliable at times.
So... is rubber a type of plastic?
Additionally, what makes a rubber, a rubber?
or if that sounds too philosophical, what properties (chemical, physical, or otherwise) that allows us to classify a material as rubber. Likewise for other types of plastics too, if you know.
An article I found: http://www.plasticsindustry.com/synthetic-rubber.asp seems to say that rubber is plastic (and very confident about it); however, I want to double check before correcting the wikipedia article.
24 Jun 2009, 2:08 am | click here to read more
I'm really confused about what they are.... could you please list the products below into monomers and polymers for me?
- Plastic bottle
- Plastic pail
- Plastic bowl
- Plastic box
- Plastic bag
- Record (CD)
- Carpet
- Rope
- TV case (plastic)
- Hamburger package
- Insulation on wires
- PVC
Thanks in advance!
24 Jan 2010, 7:21 am | click here to read more
There are three different kinds of polymers used for kitchen plastic wrap: polyethylene (e.g., Handiwrap or Glad Wrap), polyvinyl chloride (e.g., Reynold's Plastic Wrap) and polyvinylidene chloride (e.g., Saran Wrap, which is almost 90% polyvinylidene chloride).and i have to compare them to look which one would best prevent evaporation.. help me plz!!!! its due 2mro
24 Feb 2010, 8:55 pm | click here to read more
1) What number of bonds can nitrogen form with carbon is the species was uncharged?
A) 2
B)3
C)4
D)5
2) Plant based compounds containing a carbon ring and an amine type nitrogen are called
a)neurotransmitters
b)alkaloids
c)enzymes
d)none of the over
3)Tylenol contains the atoms: carbon, hydrogen, oxygen and ___.
a) Nitrogen
b)Sulfur
c)Phosphorous
d)Fluorine
4)An amide is found by the reaction of an amine and a(n) _______.
a)ether
b)carboxylic acid
c) alcohol
d) ester
5)Nylon is an example of a _____________ polymer.
a) addition
b)subtractive
c)condensate
d)none of these
6) The diol bis-phenol A can be reacted with carbonic acid H2CO3 to form a plastic called polycarbonate.
a)True
b) untrue
7)Nylon is a polyamide polymer used for textiles and many other applications.
a) True
b) False
24 Feb 2010, 2:53 pm | click here to read more
actually am pursuing a diploma in plastic technology from Delhi and i want to take an admission in DELHI COLLEGE OF ENGINEERING after diploma in polymer tech. & chemical engineering m 20 year of age & i had taken an admission in diploma after 12th which i did from Delhi so please tell me what is the procedure of admission in DCE after diploma?
24 Feb 2010, 12:51 pm | click here to read more
is it possible to enclose a 100% vacuum using plastic?
don't the tiny air molecules slowly make their way through the tangled mess of polymer molecules and make their way into the vacuum?
doesn't it depend on thickness? how so?
how much air would leak in after say 10 years?
(assuming that air pressure is 1 bar and every seals and construction are perfect)
23 Sep 2009, 6:50 pm | click here to read more
1 Answer:
The process of separating petroleum into its fractions is called
a. boiling.
b. condensation.
c. sublimation
d. refining.
2 Answer:
An example of a synthetic polymer is
a. an amino acid.
b. cotton.
c. nylon.
d. wool
3 Answer:
Petrochemical products produced through polymer chemistry are
a. flexible.
b. heat resistant.
c. light weight.
d. every of these.
4 Answer:
The name given to the molecular units that make up a polymer is
a. condensation.
b. fractional distillation.
c. monomer.
d. vaporization.
5 Answer:
The purpose of a fractionating tower is to allow the crude oil to
a. chilly, condense, and vaporize.
b. condense, chilly, and vaporize.
c. vaporize, chilly and condense.
d. vaporize, condense, and chilly
6 Answer:
An example of a product made from polymer materials is
a. glass.
b. paper.
c. petroleum.
d. plastic.
7 Answer:
Scientists predict that polymer products will increase the use of
a. nuclear energy.
b. tidal energy.
c. solar energy.
d. wind energy.
8 Answer:
Vaporization in a fractionating tower causes the crude oil to be
a. collected and separated.
b. collected and combined.
c. separated and collected.
d. combined and collected.
9 Answer:
An example of a natural polymer is
a. silk.
b. phenol.
c. glycerol.
d. vinyl chloride.
10 Answer:
Which of the following crude oil products in not used as a fuel?
a. gasoline.
b. asphalt.
c. kerosene.
d. diesel fuel.
22 Jul 2009, 3:19 pm | click here to read more
1) I came to know that the plastic property can be varied with the addition of plasticizers and binders. How exactly does this happen? What is the science behind this? Do the plasticizers and binders change the structure of the polymer?
2) Plasticizer + Binder = ? What if we add both together?
3) Are there things such as natural plasticizers and binders? If so, what examples are there?
If I am not wrong... Sugar and Milk are binders? Are they?
Thanks in advance!!! :D
19 Dec 2009, 4:48 am | click here to read more
i want to buy a Swiss Arms SA1 airsoft rifle but dont know if it is good quality. it is
Swiss Arms Licensed
Metal Barrel Assembly and Bolt
Light Weight Polymer Stock
Real Working Bolt
Durable Metal Trigger
Specifications:
Body Components: Metal and Polymer Plastics
Overall Length: 42.5"
Hop Up: Adjustable
flame Mode: Bolt Action Single Shot
Gun Weight: 4.8lbs
Muzzle Velocity: 400-425.00 FPS with .20 gram BBs
Front Sight: None
Rear Sight: None
Optic: Not Included
Effective Range: 100-125 Feet
about how many yards can it flame within a 3in group?
18 Jun 2009, 1:44 pm | click here to read more
In an experiment to prepare a polymer , equal volumes of styrne and kerosene are miixed and then heated reflux for about an hour . After cooling , the resulting mixture is poured into a big volume of methanol . A white waxy solid is formed .
What is happening in this experiment? What are the uses of kerosene and methanol?
18 Feb 2010, 10:22 pm | click here to read more
i need the mold of the outside shape, but the inside is hollow and has fixing points, how would i make an exact copy of this object and in tough plastic..I have the part to copy and have been advised to use super sculpey polymer clay and then a resin plaster ?, is this right and how would i make this to an exact replica, i have never done this before, and not sure how to copy both sides to make one piece to be exact to the original,? help me please....
17 Jul 2009, 3:59 pm | click here to read more
Aren't CREATED plastics and Gods human Scientists wonderful tho?
http://www.the-scientist.com/blog/displa…
Scientists were able to synthesize the CREATED sRBC particles by coating a polymer doughnut-shaped template they created with up to nine hemoglobin layers along with other proteins; they then removed the template. The particles that resulted came out with the same size as natural red blood cells. They are as flexible and can carry as much oxygen as the natural ones too.
Several questions, including how long the particles will remain in circulation, how the immune system will react to the synthetic blood cells, and how efficiently they transport oxygen, remain to be answered.
theo the cape Cod ....
in a previous post explained...differentiated cells appeared that distributed food and oxygen, thus erythrocytes evolved in certain marine or polychaete annelids.
Th cells appeared....from where? Its source has no explanation from evolution...nor the theory of how it did arrive about.
_Jack_....
your link doesn't exist..
Blood:
Evolution of blood cells
http://www.ncbi.nlm.nih.gov/pubmed/10085…
17 Jan 2010, 11:08 am | click here to read more
God is omni- gift within every humans..... It is the life blood that flows within each human.
It is this active life source that go's back to whom it came.Our consciousness ceases to exist.
Ecclesiastes 3:19 states.......
For the fate of humans and the fate of animals are the same:As one dies, so dies the other; both have the same breath.There is no advantage for humans over animals,for both are fleeting.
We make a free will choice as to to follow the spirit that is in our life blood,
or we pick not to follow for whatever reasons.
It is still his blood, his active holy spirit. God can pick to use his spirit to guide us in his ways,but if we tug away,...........God will not take your life blood away, but he is no longer your source for guidance. And we know that leads to being unfavorable to God every Mighty.And narrow is the road to salvation. He does not want any to die.But he knows they will.
Aren't CREATED plastics and Gods human Scientists wonderful tho?
http://www.the-scientist.com/blog/display/56218/
Scientists were able to synthesize the CREATED sRBC particles by coating a polymer doughnut-shaped template they created with up to nine hemoglobin layers along with other proteins; they then removed the template. The particles that resulted came out with the same size as natural red blood cells. They are as flexible and can carry as much oxygen as the natural ones too.
Several questions, including how long the particles will remain in circulation, how the immune system will react to the synthetic blood cells, and how efficiently they transport oxygen, remain to be answered.
hmmmm....most don't seem to know....
so non answers somehow satisfy that they answered where blood comes from....
interesting.
*Maybe * and could be ....is seen in one explanation....but science isn't giving answers to its origin. it is a big maybe for the realization of the end result of evolution.
Actually Primary.
17 Jan 2010, 10:36 am | click here to read more
Ok the first nice i ever used was this ( 3 yr ago im 16 )
http://www.joann.com/joann/catalog/productdetail.jsp?CATID=cat2741&PRODID=prd2059
but it broke every to pieces and felt... ( fairy) dollar tree plastic like i hated it D:<
I want something that will look good i plan on making little dolls and figureans ( never really sculpted before ) if the clay is on that website i can buy it
look, i was thinking super sculpey but with shipping its like 24dollars D:
( no art Supply store here )
17 Feb 2010, 3:36 pm | click here to read more
I've used brake cleaner as a cheapie cleaning spray on my steel and wood firearms with no sick effects other than sometimes needing to re-oil the wood.
I have a Marlin Papoose and a Glock that I'd like to use this on, but so far I've stuck with Hoppes No. 9, bore snakes and patches because I don't know about the plastic.
Could it be discolored or damaged by the powerful solvent?
.
16 Oct 2009, 9:24 am | click here to read more
I have a plastic (recycling #7) container which came in contact with my FIMO brand polymer clay. Now I can't receive the smudges off!! In addition, the places where the clay came in contact with the plastic are now much smoother and softer than the original plastic.
16 Nov 2009, 1:20 am | click here to read more
plz pick and why. THANKS!
a.aligned, cross linked case
b.network case
c.semi-crystalline case
d.crystalline ceramics
16 Jun 2009, 3:07 pm | click here to read more
I got some Easter eggs and covered them with 1/8" layer of polymer clay. What polishing medium should I use in the tumbler for the best results? I don't want to accidentally rub the clay off.
16 Aug 2009, 5:15 pm | click here to read more
In the production of printed circuit boards for the electronics industry, a .60-mm layer of copper is laminated onto an insulating plastic board. Next, a circuit pattern made of a chemically resistant polymer is printed on the board. The unwanted copper is removed by chemical etching, and the protective polymer is finally removed by solvents. One etching reaction is
Cu(NH3)4Cl2(aq)+4NH3(aq)+Cu(s)--->2Cu(NH3)4Cl(aq)
A plant needs to manufacture 10,000 printed circuit boards, each 8.0x16.0 cm in area. An average of 80.% of the copper is removed from each board(density of copper=8.96g/cm^3). What masses of Cu(NH3)4Cl2 and NH3 are needed to do this? Assume 100% yield.
16 Aug 2009, 12:10 am | click here to read more
I am thinking of using it to make plastic armor for LARP combat and if strong enough SCA combat. Does it have basically the same properties as PVC?
14 Dec 2009, 12:56 pm | click here to read more
I have looked everywhere i can think of to find an answer to this question, so please could you help me:
Ethene can undergo many addition reactions to form long chain polymers. What reaction conditions are necessary for this to happen and why are these needed?
Thankyou very much.
13 Dec 2009, 10:06 am | click here to read more
A:Reprocessing by remelting plastics involves breaking the polymer back into its component monomers.
B:Burn polymers to obtain energy, energy recycling.
Take used polymer such as polystyrene and produce a lower quality
polymer product such as insulation, toys, or packaging peanuts.
C:tiny inorganic and organic contaminants in polymers complicate the plastic recycling process.
D:Transforming the plastics to create synthetic crude oils or synthesis gas.
12 Jun 2009, 8:11 pm | click here to read more
Its a black polymer knife, or difficult plastic whatever you wanna call it. Its made from the same material Glock pistols are made from and not detected by metal detectors.
Also I live in England, not USA
12 Feb 2010, 2:12 pm | click here to read more
I watched a video on wonderhowto.com and I dont know what and where do "blind wand" aluminum wand used for. Here is the link of the video:
http://www.wonderhowto.com/how-to/video/how-to-create-custom-led-eagle-eye-rings-for-your-car-190310/
And also, the reflective tape used there, is it reflective in the GLUE SIDE? Im guessing yes...
Where do I find that wand!?!?! it looks like its made of some soft of polymer, plastic.
thanks!
11 Jan 2010, 10:06 am | click here to read more
I watched a video on wonderhowto.com and I dont know what and where do "blind wand" aluminum wand used for. Here is the link of the video:
http://www.wonderhowto.com/how-to/video/how-to-create-custom-led-eagle-eye-rings-for-your-car-190310/
And also, the reflective tape used there, is it reflective in the GLUE SIDE? Im guessing yes...
Where do I find that wand!?!?! it looks like its made of some soft of polymer, plastic.
thanks!
11 Jan 2010, 10:05 am | click here to read more
1. What is the formula for a compound formed from potassium and phosphorus?
a)KP3
b)KP
c)KP5
d)K3P
2. Which of the following is a naturally occurring polymer?
a)nylon
b)protein
c)plastic
3. Which of the following is the best description of how electrons are transferred in an ionic bond?
a)A metal atom loses electrons and a nonmetal atom gains electrons.
b)A metal atom gains electrons and a nonmetal atom loses electrons.
c)A metal and a nonmetal atom lose electrons.
d)A metal and a nonmetal atom gain electrons
10 Sep 2009, 11:42 pm | click here to read more
I have a science project on polymers and i need help coming up with an idea. The project is to find a product made out of plastic and then to arrive up with a product that could be made by recycling the plastic.If you have any ideas at every that would be great.
10 Oct 2009, 4:35 pm | click here to read more
In the production of printed circuit boards for the electronics industry, a 0.60-mm layer of copper is laminated onto an insulating plastic board. Next, a circuit pattern made of chemically resistant polymer is printed on the board. The unwanted copper is removed by chemical etching, and the protective polymer is finally removed by solvents. One etching reaction is the following.
[Cu(NH3)4]Cl2(aq) + 4 NH3(aq) + Cu(s) --> 2 [Cu(NH3)4]Cl(aq)
(b) A plant needs to manufacture 10,000 printed circuit boards, each 7.6 x 15.0 cm in area. An average of 72% of the copper is removed from each board (density of copper = 8.96 g/cm3). What masses of [Cu(NH3)4]Cl2 and NH3 are needed to do this? Assume 100% yield.
[Cu(NH3)4]Cl _____g
NH3 _____g
1 Jan 2010, 7:22 pm | click here to read more
1. which of the following is not true of compounds made of molecules?
a. they may exist as liquids
b. they may exist as solids
c. they may exist as gases
d. they have high melting points
2. ionic solids ______
a. are formed by networks of ions that have the same charge
b. melt at very low temperatures
c. have very regular structures
d. are sometimes found as gases at room temperature
3. a chemical bond can be defined as ____
a. a force that joins atoms together
b. a force blending nuclei together
c. a force caused by electric repulsion
d. every of the over
4. which substance has ionic bonds?
a. CO
b. CO2
c. KCl
d. O2
5. covalent bonds _____
a. join atoms in some solids, liquids, & gases.
b. usually join one metal atom to another
c. are always broken when a substance is dissolved in water
d. join molecules in substances that have molecular structures
6. a compound has an empirical formula CH2. its molecular formula could be ____
a. CH2
b. C2H4
c. C4H8
d. either C2H4 or C4H8
7. the chemical formula for calcium chloride is _____.
a. CaCl
b. CaCl2
c. Ca2Cl
d. Ca2Cl2
8.the emperical formula of a molecule
a. can be used to idenitfy the molecule
b. is sometimes the same as the molecular formula for the molecule
c. is used to name the molecule
d. shows how atoms bond in the molecule
9. every organic compounds
a. arrive only from living organism
b. contain only carbon and hydrogen
c. are biochemical compounds
d. have atoms connected by covalent bonds
10. Which group is not a polymer
a. amino acids
b. carbohydrates
c. porteins
d. plastics
11. compare the chemical structure of oxygen diflouride with that of carbon dioxide. which compound has the larger bond angle? what nice of bonds do both compounds have?
12. determine whether the chemical formula C5H5N5 is the emprical formula of molecular formula for adenine.
13. name the following covalent compounds
a. SF4
b. N2O
c. PCl3
d. P2O5
14. Compare the metallic bonds of copper with the ionic bonds of copper sulfide. why are the metals rather than ionic solids used in electrical wiring?
15. explain why proteins and carbohydrates are polymers. what is each polymer made of?
18. Determine the chemical formula for each of the following ionic compounds.
a. strontium nitrate, an ingredient in some fireworks, signal flares, & matches
b. sodium cyanide, a compond used in electroplating and treating metals
c. chromium(iii) hydroxide, a compound used to tan and dye substances
d. aluminum nitride, a compound used in the computer-chip-making process
e. tim(ii) flouride, the source of flouride for many toothpastes
f. postassium sulfate, a compound used in the glass-making process
19. a substance is a solid at room temperature. it is unable to conduct electricity as a solid but can conduct electricity as a liquid. this compound melts at 755 c. Would you expect this compound to have ionic, metallic, or covalent bonds?
20. dodecane is a combustible organic compound used in jet fuel research. it is an n-alkane made of 12 carbon atoms. how many hydrogen atoms does dodecane have? draw the structural formula for dodecane.
1 Feb 2010, 11:29 pm | click here to read more