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Chemistry

~288900 answered questions
Parent Category: Science
This category encompasses all questions about the composition, structure, properties, and reactions of matter.
melt calendering Plexiglas is the trade name of the polymer polymethylmethacrylate. Objects from PMMA are manufactured by extrusion, injection or compression. The method of cells casting was abandoned now.
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There is a little spring that is attached to the indicator pointer that keeps tension on it. That spring may have fallen off. I'm having the same problem on my 1996 Ford Club Wagon. Good Luck.
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There should be a cable that hooks on the back of the cold/hot dial, it runs from the dial to a control flap, make sure it is still connected. To see where it connects under the dash you have to take the glove box out. To look at the dial you have to remove the strip on the dash and there should be …
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%REPLIES% Answer Several. Dirty air filter. defective CO2 sensor, needing new spark plugs, wires, and possibly cap & rotor. Worn out catalytic converter(s), or other engine control devices that aren't working properly. Answer Due to the age of the car, check all the vacuum hoses. Replace as…
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All of the answers below are correct. I'll just add one point. After you put the paint on the part that was previously rusted, put an anti-rust treatment to avoid recurrence of rust or migrating to other parts. You're kidding right? Even pros have a tough time doing this-killing the rust- and a…
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Until it is flexible enough for reshaping, it is also a bad idea to do this yourself, you should go to a professional. I have never put a stick in boiling water to curve it before. The way I used to do it was to either hold the blade of the stick over the burner on the stove or heat it up with a blo…
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ADD is a chemical reaction in the brain. Believe it or not, an ADD brain shows LESS activity than a normal brain. The neurons in the brain are not active enough to properly connect, causing inattentiveness, impulsiveness, hyperactivity in some, etc. Stimulant drugs raise the level of activity in the…
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1. It is best to use distilled water. Minerals in your tap water may react with the metal. 2. Use SOAP, not DETERGENT. Again, chemicals may affect the coin surface. 3. Let the coins soak to loosen the surface dirt then gently sweep it off with an artist's camel hair brush. 4. Allow to air-dry laying…
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With most companies, you can cancel your policy at any time, with no penalty. However this will not stop the rate increase. If your insurance rate is said to increase upon renewal due to a insurance claim, or points on your license, the increase will still be in effect if you re-apply. The company w…
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%DETAILS% There are so many variables that might be involved in your calculations regarding 1/2 a tank and 1/8 of a tank, i.e.: Was the air pressure in your tires the same both ways of travel? Did the relative ambient temperature remain constant? Did you purchase the gas at the same vendors durin…
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I have never seen one after placing hundreds of them over the past 30 years, nor have I read anything in the research or performance evaluation literature regarding that type of response. It is possible, however, to experience a slight, temporary chemical burn from the etching gel used to prep the …
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It might be possible, you need to check with a professional Insurance Agent to help you. It depends on the number of employees and which ones are out of state.Try going to then scroll down to the link for NAHU Agent finder
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You have two things that contribute to your high use of acid. The walls of your plaster pool actually absorb some of the acid over time as the walls continue to cure. This is very common in new pools. You may see a reduction in the amount of acid after a few years. Also, the salt system you use …
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Answer Sounds like white water mold to me. Hum, take a sample of the "flakes" and water if possible to local pool store for analyzing. k If you have a Salt Water Chlorinating system and hard water to start with, then what you are seeing is calcium precipitation. Water can only hold a certai…
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The corrosive properties of water are not affected by its hardness. This is a common misconception that can be explained by the types of source water that yield naturally soft or naturally hard water. If your water is naturally soft, there is a good chance it is also corrosive due to other factors. …
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Causes of hair color changes Although there are a few chemicals which can contribute to causing hair to change color it is usually unbalance water which is the primary source. The color can help us indicate what type of metal it is from. Example: Green hair is usually caused by copper being dissolv…
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%DETAILS% It's sediment from you water heater. The chlorine and other chemicals put into the water to purify it, settle in the water heater when your water isn't being used. When you use your hot water your water heater starts filling with cold water which shakes up the sediment in the bottom. wh…
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Answer Hot water may have more air in it, if you look closely you will see that there are all individual tiny, tiny little bubbles in there, looking at it as a whole, it looks white. If you notice it will clear from the bottom, up. Indicating that the bubbles are rising. I can say definitely it's…
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If you have an old complex built pre 80's, you may not have pressure balance shower valves. Replace existing valve with a new pressure balance valve. The problem is most notable in second and above floors, but can occur at the ground level as well.Setting at the water heater has been chaged. This …
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%REPLIES% Answer Because someone has connected the hot water line to the cold service. They are reversed. Answer I'm not a plumber, so I don't know if the first answer is correct or not. However, our landlord replaced our shower fixture with one that could be adjusted so that it prevented…
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What is a PVC vent pipe doing in your attic? It shold not terminate in an attic if it is a vent pipe. Check to see if it is an air supply for your funace. Something doesn't seem right.I have seen PVC pipe used (incorrectly) for venting a bathroom fan or similar. Regardless of wrong or right material…
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If you have the old style seats and washers type shower valve, the water is trying to squeeze between the seat and the washer. If it was air, it would whistle. Water hammers. Usually high pressure contributes to this effect. The only way to solve this problem is to replace your shower valve with a …
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Cohesion, Moderation of Temperature, Solvent of Life, and Insulation of Bodies of Water by Floating Ice.
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Quite a lot: differentiation, integration, eigenfunctions and eigenvalues, error analysis, use of simple mathematical equations, such as moles=mass/molar mass, and more complex equations such as the Guggenheim equation, algebra, vectors, matrices... the list goes on. Essentially if you have done A l…
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I picked up this drooper.small.5.J Trojan from so,e net site...I think it attacked my browser cookies. I have AVG and when I ran it it detected the Trojan and put it in my virus vault it was located in the system file: windows/96WU19RD.EXE....moving to the virus vault seemed to satisfy the AVG alert…
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You are burning the inside tissues and membranes of your nose. This is not a healthy thing, be sure to ventilate your work area to alleviate this condition somewhat. Dilute the bleach with water if possible. Wear a thin mask as well.
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the other guy is right just because you have a GED doesnt make you older but there is a state that you can get married at and its las vegas!
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If the child is still fine then he is in no danger from the alcohol. However, he is in danger if he is still in a place where he can get at things like rubbing alcohol. Child locks are a must. Also children that small need to be in sight of an adult all the time. Not just where they could be seen, t…
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Most home systems use R-22 refrigerant. R-410a, known as PURON, is also an increasingly used refrigerant. If you see a pink sticker on the outdoor unit, it will say on the tag with the model and serial numbers r22 or 410a. "Freon" is a trademark of DuPont, and is NOT the real name of refrigerant. …
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I'm a material researcher and I've reviewed this extensive answer. There are many inaccuracies and bad advice here, along with extremely effective and absolutely clear recommendations that should work very well. Nail polish is, for practical intents and purposes, a form of nitrocellulose lacquer. N…
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Wiki s contributors suggest these methods: Lift the carpet, put a roasting pan under the spill. Then slowly pour boiling water on the wax spill. The wax will melt down though the carpet into the roasting pan. Then do the same for the carpet pad, if it needs it . By the way only the boiling water an…
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When baking, folding is a method used to incorporate more air into the mixtures. In order to fold, you need a spatula or a spoon. Carefully pour mixture A into mixture B a little at a time. Take the spatula, scrape the bottom of the bowl, and take mixture B and "fold" it over the other mixture. Do n…
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Tire pressure is supposed to be measured while the tire is cold. Tire pressure is higher when the tire is hot; therefore, the pressure of a hot tire will drop below its limit when it cools down.
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OK you've got it the wrong way round.Alkalinity isn't quite that. It is "Total Alkalinity". To lower Total Alkalinity you must add pH Buffer.Your pH is way way too low. To raise it, you must add Soda Ash. Confusing terms but that is how it is. Most pool shops offer free water testing so they will ac…
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%DETAILS% Well, whether it is illegal or not to clean a pool with people in it is unimportant, it is inadvisable considering that most of the chemicals that are added to a pool are hazardous until dissolved in the proper concentrations in the pool. Most of the chemicals used to balance or clean a…
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You can, if the water presently in the pool is 'hard' - but be very careful to keep an eye on the Calcium Hardness of the pool water. If you filled a pool with water from the softener, the water would be hungry for calcium and drag it out of the pool walls, making them feel and look like sandpaper. …
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No, you do not need to change or alter your existing filter - or any other item of equipment. The saline system is compatible with any type of filter and any type of pool or equipment. Feel free to contact me if you have any other questions about the salt (saline) system.
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Baquacil reacts with iron the same way a Chlorine pool would. Most times the water will turn either brown or green and the product to clear it up is the Baquacil Metal Control which will filter them through. It is best to check your filter during this time and hose it off if needed because the filte…
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No. Other than blue dye or food coloring (including the coloring that is in some pool chemicals), nothing adds a blue color to the water.So, why does the water in a white pool look blue? The water absorbs the shorter wavelengths of light (the red range) first. The longest wavelengths - the blue rang…
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Hi, I'm having the exact same problem. In fact, mine got so bad that we had to drain the pool. Anyhow, still waiting for an answer to your question for my own use, but i can tell you what will NOT work!! (beware! they were recommended from people on the net) A clarifying treatment (usually a blue b…
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Hum, what kind of debris? You don't get debris from pool additives normally. You may get other things but not debris. What did you add to the pool? k
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softer water, easier on your eyes and swimsuits due to the fact that pure chlorine is being made without any acid or inert ingredients. it produces a perfect pH right from the unit. never have to buy chlorine or shock again! i recomment the autopilot system.
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You could add it back to the pool, if you need to lower the pH - but why put all the gunk the cell has taken from the water, back into the water? Better to discard the cell cleaning acid and use fresh acid to lower pH.
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A co-signer is most usually one of your parents, or close relative. They are not "bought" If somebody is telling you that one can be bought, there is a scam in the works. The reason for a co-signer is because the one who is actually making the purchase is not credit worthy enough in the lender's eye…
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muriatic acid- - - - - phosphoric acid is very commonly used. It can be had as a paste called "Naval Jelly."
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Ammonium nitrate crystals and water. When you pop the water pack, the two undergo an endothermic reaction, forming ammonium and nitrate ions (NH4+ & NO3-). Water breaks the two parts of NH4NO3 into the positive and negative parts, and it takes heat energy from the surrounding area to make the se…
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Active Ingredients Ethyl Alcohol by Volume 70% Ingredients Denatonium Benzoate , Methyl Isobutyl Ketone , Water The ingredients will be listed on the bottle. There are two standard kinds of rubbing alcohol: (1) one made with isopropryl alcohol, which has a certain toxicity but is more pleasant o…
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The key ingredient in many hand sanitizers is ethanol, as my slightly informed friend below has indicated. There are other ingredients that are also antibacterial, but ethanol is generally the most popular. However, the key ingredient in rubbing alcohol is isopropyl alcohol. This is not the same thi…
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The percentage is irrelevant. Any substance that is inhaled has a direct effect upon the nasal passages, airway, lungs brain cells. Regardless of how innocuous a substance may seem, it should never be used in this manner. Except obviously those products that are specifically for inhalation, deconges…
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The freight charges can be listed as HANDLING and that would be better. To call it Freight Charges is NOT illegal UNLESS applying for INSURANCE and listing the freight charges as part of the value of the item(s) being shipped.
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Weight of a Gallon of Salt Water See the web links below this answer for an automatic calculator that will give you the density of water at whatever temperature and salinity you want. Once you know the density, it is easy to figure out how much a gallon weighs ( 1 m3 = 264.17 gallons, and 1 kg = 2.2…
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Weight of Water Compared to Weight of GasolineAt a temperature of 20 oC or 68 oF, a (U.S.) gallon of pure water weighs about 8.34 pounds, whereas a gallon of vehicular gasoline weighs about 6.15 pounds at that temperature.   Diesel weighs about 7.1 pounds per gallon.Though the question is app…
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Evaporative cooling Any object will absorb heat from its surroundings if the surroundings are warmer than it. Since room temperature is usually lower than body temperature, alcohol is usually colder than your skin. When you put alcohol on your skin, first, your body will warm the alcohol until it i…
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Density is a unit of measurement defined by how much matter takes up a certain amount of volume or space, therefore, when salt is added to water the following occurs: A) The volume or space that the water takes up has very slightly increased but B) The mass of the water has very greatly increased …
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An atom is a building block of matter.An atom is the smallest amount of a substance that we can have that will still retain all the features of that substance. Should it be subdivided any more, the qualities of the substance will be lost. The atom comes from an ancient Greek idea that stated exactly…
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Ordinarily stain molecules are removed in one (or a combination) of these 3 ways: 1. Dissolved and carried away in a water/detergent mixture. 2. Cut into smaller fragments by the stain remover and then carried away. 3. Strongly bonded stain molecules may require a non-aqueous (non water based) stron…
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In addition to water, for which the solid form (ice) is less dense than the liquid form, the element Gallium is also less dense in the liquid state. Gallium can be solid at room temperature but will melt in the hand. Less Dense in Solid Form confirmed as solid less dense than liquid:gallium - 5.91 (…
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Rust- Mechanics Rust is the common name for a very common compound, iron oxide. Iron oxide, the chemical Fe2O3, is common because iron combines very readily with oxygen. This open-air oxidization of iron is called rust; it is because of this pure iron is rarely seen in nature. Iron or steel rusti…
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Elements and Compounds The elements are Hydrogen, Oxygen, Sodium, and Chlorine. The compounds are Water and Sodium Chloride (salt).
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CARBON CYCLE:- Carbon is found in various form on the earth. It occurs in the elemental form as diamond and graphite. In the combined state, it is found as carbon di oxide in the atmosphere; as carbonate and hydrogen-carbonate salts in various mineral, while all life forms are based on carbon conta…
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Easy, it's not...."Test Tube" babies are a product of a process in which an egg and a bunch of sperm are isolated in one tube (dish) and once the egg is fertilized, it's inserted back into the female to grow. This is sometimes done with multiple eggs to increase the chances of one surviving with the…
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Answer Ideally it should be neutral ot sightly basic: The proper pH for a pool is in the range of 7.2 to 7.6. Perfectly neutral water would be 7.0.
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  First, the term "test tube" is popular, but it is not the terminology used by scientists. They instead use the latin term 'in vitro' (literal definition: in glass; but modern definition more like 'outside the organism'; the opposite is 'in vivo'), In vitro fertilization is simply putting…
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The reason water freezes is that as heat energy leaves the water, the water molecules move more slowly. Ice crystals begin to form a solid lattice with higher cohesion between molecules. If the ice is reheated, it will lose its lattice structure and resume liquid form.
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No. No chemicals can melt metal. Only heat can do that. (You could pour molten iron on aluminum and melt it, but it's the heat doing the melting.) Lots of chemicals can dissolve metals but not melt it.
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It is the valence shell that chemically reacts. This is the farthest out layer. Atoms try to fill it, no matter what charge it will give them. For hydrogen and helium only this shell holds two electrons, the rest eight. For an example take sodium(1 electron in valence) and chlorine(7 electrons in va…
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It would be very easy to get a job but it probably won't be doing anything with chemistry. Most chemistry jobs require at least a masters or doctorate. You might be able to find work as a lab assistant doing menial tasks but without an advanced degree it is next to impossible to find work in the fie…
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When water freezes, the molecules are locked into place in a crystal structure, and it turns into a hard solid, or ice. The ice is hard because unlike in water, where the individual H2O molecules are free to move about and are not fixed in position, in ice each of the molecules is connected to the m…
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Offset irons are easier to hit because of the position of the club at impact. At impact, the hands should be leading the ball, therefore having the club face lag behind. The offset of clubs allow non-pros to have a similar club location at impact, and this will give you a better ball flight.
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Answer I detail/restore headlights for used car dealers and I use The CrystaLenz Headlight Restoration Kit. Their product works great and is VERY easy to use. Check out their website CrystaLenz.com. An Acrylic lens deoxidizer is the safest fastest DIY way to get your headlights clear. It is the so…
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Answer Open and read your owner's manual to find this information. Use only the octane rating stated there. If it requires premium, do not use regular. Pinging and engine damage can occur. Answer #2 It says "Premium Fuel Recommended", so while you can use regular, you can expect less power an…
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Ammonium Nitrate and water. Urea + plus a Non-Toxic Cooling Additive and Water providing a safer alternative to the dangerous Ammonium Nitrate *Ammonium Nitrate is highly dangerous and used as an oxidizing agent in explosives.
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You can melt ice by using salted water, using salted water it helps to dissolve ice very slowly. Salt is broken down it originally comes from grit and grit is a big form of salt. You also can melt ice by tipping bleach over it, with bleach been a disinfectant it helps melt the ice by the strong for…
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I would think so. Why would you even be sniffing it??   I guess people do it because it smells so good and do get sort of a high from it. I know it's not good for your health but it is addictive and very hard to quit.   Yes, sniffing rubbing alcohol is very dangerous, it can cause bad h…
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Combustion is an exothermic reaction, generally categorized by the release of energy through heat or light.A combustion reaction must occur between oxygen and a fuel. The products vary from incomplete to complete combustion. Incomplete combustion occurs under the lack of oxygen, which complete combu…
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A chemical substance is some form of liquid or solid (or gas!) made out of chemicals or elements.
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The units for density are incorrect. If the density of a block of wood is 0.5 g/cm3 then the volume of a 27 g block would be 27/0.5 cm3 = 54 cm3
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Your question is somewhat difficult to interpret, but presumably you are referring to visible light and the word "clearly" is key. Many media are transparent to the electromagnetic radiation we call light. Light passes through a vacuum freely, without obstruction or change. A wide range of gasse…
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Sand and Ice Unless it's at a higher temperature that the ice, it does not. Sand lays on top of ice and allows shoes and tires more traction than bare ice, but it won't melt it unless it has some energy advantage over the ice. Ice doesn't absorb light very well - an evident fact as you can see throu…
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Answer 1 molecule of pure water is composed of 2 hydrogen atoms and 1 oxygen atom. http://en.wikipedia.org/wiki/Water_%28molecule%29 Answer Other than pure water(commonly referred to as 'distilled water'), the *source* of a water sample will greatly affect what is likely to be present to…
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Well your obviously not using chlorine because the purpose of putting chlorine in your pool is to kill algae. well maybe you are using chlorine but not enough, or just a dodgy product. follow the directions on the bottle - it will tell you how much to put in. My pool does the same thing and I have b…
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Answer The minimum voltage necessary to generate hydrogen and oxygen from water by electrolysis is 1.23 V. It depends on how you do it if it will take that much or more (if you don't use the correct electrode, it will take much more, but never ever less). How much power it takes depends on h…
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Plastic soft drink containers can be used to freeze water, but you might not want to. Because reused soft drink containers can lead to germs. But if you want to just follow these steps. Fill them with drink & use them as freezer packs in chilly bins Since water expands when frozen, be sure not…
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A good sign is a sign that attracts the customers attention AND MAKES THEM want to BUY RIGHT NOW. If a neon sign will do that for your business, then buy the one that does this the most. If a retail store, then the brightest, sharpest contrasting, attention getting color available. The same with the…
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Sodium Hydroxide and Pepsin Pepsinogen is an inactive form of the enzyme pepsin. Pepsin is a protease, meaning a hydrolytic enzyme, one that breaks down its substrate. In the stomach, pepsin breaks down proteins to smaller polypeptides and amino acids. The environment in the stomach is very acidic…
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Alcohol is the name given to a group of molecules called hydrocarbons. The alcohol present in drinks is ethanol. These hydrocarbons contain many chemical bonds and in turn a large energy potential. When the the alcohol is lit by a another source of energy (lighter) the bonds break rapidly releasing …
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An electrolyte is a aqueous solution which acts as a medium to conduct electricity. Electrolyte is defined as the solution in which electricity is passed and causes ions to move towards their respective electrodes. An electrolyte always contains a solute, which dissociates in the water to form ion…
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Extruded aluminum (or aluminum as they say in England) is just aluminum squeezed through an oriface. Just like that play-dough toy where you squeeze out a length through various shaped holes.
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Yes. This is fine because alcohol freezes at - 80�C and boils at +78�C.Rum, sambuca and beer all have water in them. The water can evaporate as well as the alcohol at about 20 Degrees Celsius dependant on environmental factors like draft, bottle cap and temprature to name a few.  Let me gu…
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There are several types of bonds possible. There are hydrogen bonds, covalent bonds, ionic bonds, and metallic bonds. Atoms form compounds by sharing electrons to create full-levels which keeps them balanced and uniform. The first level is 2 electrons, the second is 8, the third is 18, and it keeps…
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Lowering Ph Your pH can be lowered by using PH minus or you may also use Muriatic acid. - - - - - It depends on what you're trying to lower the pH of...the answer above is good if you're trying to lower the pH in a swimming pool, but it's a little extreme if you're trying to lower the pH of a cup …
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The water pump is very easy to access on the 3.4's. Just follow the lower radiator hose to the engine and that's the pump you will have to replace.
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The rotor was probably not installed correctly, and it rubbed against the cap. The rotor should be pressed completely down. Make sure the cap is seated correctly on the distributor and clipped on securely, as it could cause the rubbing if it is misaligned. Just put a 009 distributor in if the weigh…
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Toothpaste works well.   Lemon juice.   Place some aluminum foil into a small tub of warm water mixed with baking soda. Immerse the silver into the water touching the aluminum foil, the tarnish will be transferred to the aluminum foil through some electrolytic process. Like magic.
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: Put it in a bottle with a tight lid, write with a permanent marker "POISON" either dispose of it in the trash or bring it to a local trash company. add baking soda to it to nutralize the pH level of the acid and bring to your local garbige company Since Muratic Acid is water soluble, dilute it th…
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Answer Hot water does not freeze faster than cold water. Nor does cold water boil faster than hot water. For water to freeze, you must remove enough heat to bring its temperature down to 0 C. The colder the water is, the less heat you have to remove before it freezes. Answer I have no idea …
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Can hot water freeze faster than cold water? It depends. Hot water can in fact freeze faster than cold water for a wide range of experimental conditions. This phenomenon is extremely counter- intuitive, and surprising even to most scientists, but it is in fact real. It has been seen and studied in n…
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Search web for Remington model 11. web info for inertia operated Browning a-5 is nearly identical.
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