a chemical reaction always converts reactants to products. Products are always formed otherwise it's not considered a chemical reaction.
Neutrons See: http://www.answers.com/topic/isotopes-1 for more information.
It is a volatile organic solvent with formula CH3COCH3. It is frequently used in nail polish removers and is a commonly used solvent in chemistry laboratories.
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Acetone - can be used in lab practicals to clean glassware, dries very quickly to prevent moisture affecting any products made. Can also be used as a solvent for certain experiments. Its chemical formula is CH3CH2OCH3 (double bonded oxygen atom)
0 °C or 32 °F or 273.15 K Under standard conditions, pure water freezes at 0°Celsius, which is the same as 32 °Fahrenheit, which is 273.15 Kelvin.
It actually varies a bit, depending on the pressure and the exact composition of the water - that is to say, impurities as solutes can lower the freezing point. The freezing point for brine established the 0° point on the Fahrenheit scale (-17.8°C).
It varies from 0 degrees F to 32 degrees F (which = 0 degrees C)
depending on how pure the water is. Answer For Celsius it is 0. It is 32 degrees Fahrenheit.
It doesn'tActually, at higher elevations, water boils sooner rather than later.
At higher altitudes, air pressure is lower. The reduced air pressure lowers the temperature at which water boils in an open container. So, water actually boils faster at higher altitudes, but it takes longer to cook foods because the water boils at a lower temperature. This lower temperature slows down the physical and chemical changes that take place when foods are cooked in water.
(Sometimes it can take water longer to boil at higher altitudes simply because it is often colder and windier at high altitudes (if you camping), and so it will take longer to heat the water).
If you are taking a chemistry class right now, you might recall your teacher talking about Gay-Lussac's law of P1/T1 = P2/T2. Therefore, given that the volume is constant, as the pressure changes from 1 ATM to a lower number, say .5, temperature must also change in proportion to the atmosphere to fit the equation. The temperature would decrease by 1/2.
See the Related Questions link to the left for more information about how barometric pressure and elevation effect the boiling point of water.
Following the idea of higher altitudes/lower atmospheric pressure, there will be less initial dissolved oxygen in the higher altitude water compared to a pot of water in lower altitudes. This will decrease the quantity of bubbles (oxygen escaping from the water) you see as the water heats but before the water actually begins to boil. If you confuse these bubbles with boiling it will seem as though you are not reaching a boil as quickly as when there is more dissolved oxygen and more bubbles.
The following correction is from a science major with chemistry minor: the above is almost true, but Gay-Lussac's law is expressed a different way. It is P1/T2=P2/T1. What the above formula describes is Boyle's law (P1/T1=P2/T2).