Chemistry

A:

Dry wood catches fire between about 300 degrees Fahrenheit and 580 degrees Fahrenheit, depending upon the species of wood and the extent of decay present, with more decayed wood being quicker to ignite. The amount of moisture in the wood is the strongest influence on wood reaching this temperature.

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  • What is the most flammable substance in the world?

    Q: What is the most flammable substance in the world?

    A: The most flammable substance in the world is chlorine trifluoride, according to About.com. This substance is so flammable that it does not require an ignition source to combust.
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  • What does "solvent" mean in science?

    Q: What does "solvent" mean in science?

    A: A solvent is the prominent component of a homogenous mixture or solution made of two combined materials. A solution is made when a lesser amount of material called a solute is dissolved into the solvent.
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  • How many elements are in the periodic table?

    Q: How many elements are in the periodic table?

    A: There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002.
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  • What temperature does water evaporate at?

    Q: What temperature does water evaporate at?

    A: There is not a specific temperature that water must be in order for it to evaporate. However, as temperature rises, evaporation typically increases because water molecules are moving more quickly. The faster they move, the more likely it is that they will break away from the pack and evaporate.
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  • How is chemistry related to the study of pharmacy?

    Q: How is chemistry related to the study of pharmacy?

    A: The study of chemistry is integral to the study of pharmacy, since pharmaceutical science studies how different medications react chemically with the chemicals within the human body. Life itself can be summarized as the sum total of chemical reactions within an organism. Pharmaceutical substances are designed to control or otherwise alter those reactions. Pharmacists are experts in dosages and related topics, while pharmaceutical science studies the chemistry.
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  • What is an example of a solute?

    Q: What is an example of a solute?

    A: A solute is a substance that can be dissolved in a fluid. One common example of a solute is ordinary table salt, or NaCl. Salt dissolves readily in water, which acts as the solvent.
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  • What is the molar heat capacity of liquid water?

    Q: What is the molar heat capacity of liquid water?

    A: The molar heat capacity of liquid water is 75.348 J/mol K. It is calculated as the product of the specific heat capacity of liquid water and the molar mass of water.
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  • Why does water evaporate?

    Q: Why does water evaporate?

    A: Water evaporates because individual water molecules break free of the bonds that hold them all together as a liquid. While water evaporates more in heat, it is possible for it to evaporate in cold conditions.
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  • What is the density of lead?

    Q: What is the density of lead?

    A: The density of lead is 11.34 grams per cubic centimeter. In U.S. measurement, the density of lead is just over 0.41 pounds per cubic inch.
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  • What are examples of solidification?

    Q: What are examples of solidification?

    A: An example of solidification is when cooking oil changes to solid after exposure to cold temperatures. Solidification, also referred to as freezing, is the process by which liquids or fluids change to solids.
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  • What is the chemical formula for ice?

    Q: What is the chemical formula for ice?

    A: Ice is the solid form of water that is created when water freezes at a temperature of zero degrees Celsius, so it has the same chemical formula of water, which is H2O. Water consists of two atoms of hydrogen and one atom of oxygen.
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  • Who discovered sodium chloride?

    Q: Who discovered sodium chloride?

    A: In 1807, Sir Humphrey Davy, an English chemist, discovered how to extract and isolate sodium from its compounds. Since sodium doesn't appear by itself in nature, this discovery lead to better understanding of sodium compounds, such as sodium chloride, which is the primary factor in the salinity of the oceans.
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  • What factors affect the solubility of a substance?

    Q: What factors affect the solubility of a substance?

    A: Temperature, pressure and substance composition can impact the solubility of a substance. Reactions between solutes and solvents can decrease the solubility of a substance as well.
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  • How do you make magnesium sulphate?

    Q: How do you make magnesium sulphate?

    A: Magnesium sulfate crystals can be prepared from Epsom salt available in pharmacies. Natural magnesium sulfate exists as the mineral kieserite, MgSO4?H2O, which is purified by crystallization.
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  • Where can sodium be found?

    Q: Where can sodium be found?

    A: While sodium is one of the most abundant elements in the crust of the Earth, About.com indicates it never exists in its elemental form. It is highly reactive and forms many compounds, including sodium chloride, or table salt. The most common form of sodium chloride on the Earth is halite, a mineral that miners remove from large mines. The rock salt from these mines remains from the evaporation of oceans.
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  • What is the composition of pure air?

    Q: What is the composition of pure air?

    A: By volume, dry air is 78.09 percent nitrogen and 20.95 percent oxygen, accounting for over 99 percent of the total volume. The remaining 1 percent is made up of argon, carbon dioxide, neon, methane, helium, krypton, hydrogen, xenon, ozone, nitrogen dioxide, iodine and trace amounts of carbon monoxide and ammonia.
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  • What is the melting temperature of steel?

    Q: What is the melting temperature of steel?

    A: Steel, an alloy of iron, carbon and small amounts of other metals, melts at approximately 1370 degrees Celsius. Because the exact chemical composition of different steel alloys varies, the melting point differs slightly depending on its grade.
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  • What is the composition of exhaled air?

    Q: What is the composition of exhaled air?

    A: In general, the composition of exhaled air is approximately 78 percent nitrogen,18 percent oxygen and 4 percent carbon dioxide. Inhaled air, by contrast, is about 79 percent nitrogen and 21 percent oxygen.
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  • What is the smallest subatomic particle?

    Q: What is the smallest subatomic particle?

    A: The smallest subatomic particle is the quark. Quarks make up larger subatomic particles called hadrons, which include baryons and mesons. Three quarks make up composite particles called baryons, and the combination of a quark and an antiquark comprise a meson.
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  • What is the difference between starch and glycogen?

    Q: What is the difference between starch and glycogen?

    A: The key difference is that starch is converted by plants while glycogen is converted by animals. However, both starch and glycogen are polysaccharide polymers of alpha glucose.
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  • Who discovered the proton?

    Q: Who discovered the proton?

    A: Ernest Rutherford gets credit for the discovery of the proton. While conducting the first experiment in splitting the atom between nitrogen and alpha particles, he discovered what had been hypothesized for many years before: the proton.
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