Chemistry

A:

Glass can be used to store things in the freezer. Glass containers can also be put in the freezer temporarily, to make a drink extra cold.

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  • What is matter made of?

    Q: What is matter made of?

    A: Matter is made of single particles called atoms and is any substance that has either mass or volume. Matter can exist in three states, either as a solid, a liquid or a gas.
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  • What did Dmitri Mendeleev discover in 1869?

    Q: What did Dmitri Mendeleev discover in 1869?

    A: In 1869, Dmitri Mendeleev discovered how to classify elements into a periodic table. Although other scientists had been trying to find a way to classify the elements, Mendeleev's version was the clearest and most systematic.
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  • What happens when oxygen reacts with copper?

    Q: What happens when oxygen reacts with copper?

    A: The combination of oxygen and copper produces the substance called copper oxide. The formation of copper oxide requires a specific formula; the creation of this element ultimately produces a gas that resides in the atmosphere.
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  • How do you identify silver?

    Q: How do you identify silver?

    A: Silver is a mineral that can be identified by its unique physical properties. It is a very resistant mineral that does not dissolve in most solvents and does not react to water or oxygen.
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  • How are colloids classified?

    Q: How are colloids classified?

    A: Colloids are generally classified into four types: emulsion, sol, aerosol and foam. The combination of fog and smoke makes up an aerosol, which is comprised of solid particles or liquid droplets dispersed throughout a gas phase. Mayonnaise is an emulsion, which are two liquids dispersed together.
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  • What is the cost of the element mercury?

    Q: What is the cost of the element mercury?

    A: As of 2014, the element mercury costs between $2,950 and $3,075 per flask. A flask is equivalent to 76 pounds.
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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 a pure substance in science?

    Q: What is a pure substance in science?

    A: A pure substance is any single type of material that has not been contaminated by another substance. Water is considered a pure substance if the water contains only hydrogen and oxygen.
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  • How many atoms make up a single element?

    Q: How many atoms make up a single element?

    A: An element is a description of a type of atom, so a single atom is representative of an element but not an element itself. "An atom" refers to a physical entity; "an element" refers to a type of atom.
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  • What is the difference between hard and soft water?

    Q: What is the difference between hard and soft water?

    A: Chemically, the difference between the two is that hard water contains calcium and magnesium ions, while soft water does not. Soft water is easier to lather with than hard water is.
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  • What is the molar mass of caffeine?

    Q: What is the molar mass of caffeine?

    A: The molar mass of caffeine is 194 grams per mole. It has a chemical structure of C8H10N4O2. It is considered a stimulant drug. Caffeine is found naturally in many seeds, leaves and fruits of plants, plus it is artificially added to many beverages and food items for consumers.
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  • How is carbon stored in the biosphere?

    Q: How is carbon stored in the biosphere?

    A: Carbon is stored in the biosphere within living or recently dead plants, animals and microorganisms in the ocean and on land. Forests contain 86 percent of the planet's carbon on top of the ground. This biomass is released into the carbon cycle through natural decomposition and respiration.
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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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  • Is silicon a metal or nonmetal?

    Q: Is silicon a metal or nonmetal?

    A: Silicon is a metalloid, which means it is a type of metal but has some nonmetal qualities depending on what element it is reacting with. An example of this would be the fact that silicon is not a good conductor of electricity.
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  • How does solar energy work?

    Q: How does solar energy work?

    A: Solar energy emerges when light energy from the sun strikes a silicon solar panel to produce an electrical current. The silicon in the solar panels can transform light energy into electricity because the movement of electrons in the silicon crystal generates electrical energy.
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  • What is Bohr's atomic theory?

    Q: What is Bohr's atomic theory?

    A: Bohr's atomic theory suggests that atoms have a positively charged nucleus that is orbited by electrons that move in circles. These electrons move in specific, distinct orbital levels. This theory has since been made obsolete but has had a lasting impact on the understanding of atomic structure and quantum physics.
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  • Why do elements tend to form compounds?

    Q: Why do elements tend to form compounds?

    A: The fact that some elements are more atomically stable than others accounts for their tendency to form compounds. This atomic stability is basically the amount of electrons an atom holds in its outer shell. When the outer shell is completely full, an atom is more stable than when the outer shell is only half full.
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  • Is aluminum soluble in water?

    Q: Is aluminum soluble in water?

    A: Aluminum is insoluble in water. In addition, aluminum oxide and aluminum hydroxide, the predominate aluminum salts are considered insoluble in water. However, seawater contains between 0.013 and 5 parts per billion of aluminum.
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  • How does gunpowder work?

    Q: How does gunpowder work?

    A: HowStuffWorks explains that gunpowder functions through a chemical reaction between the combination of sulfur, charcoal and an oxidizer, usually either saltpeter or niter. The saltpeter acts as an oxidizer, and the sulfur and charcoal combine together to act as fuel. Also commonly referred to as "black powder," gunpowder can be used as both a propellant, as in both guns and fireworks, and as an explosive.
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  • Where does plutonium come from?

    Q: Where does plutonium come from?

    A: Plutonium naturally forms in the heart of a star undergoing supernova, along with virtually all of the heavy elements in the universe. It is not found on Earth due to its instability. The most stable isotope of naturally occurring plutonium has a half-life of only 82,000,000 years and is exhausted well before it can be taken up in planetary formation. However, humans have been able to artificially create plutonium.
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  • How reactive is silver?

    Q: How reactive is silver?

    A: According to Encyclopedia Britannica, silver is one of the least types of chemically reactive elements. Silver is a chemical element, and the metal is a lustrous and white color.
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