Chemistry STAAR Review

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What is density?

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Density is the mass of a substance divided by its volume, typically expressed in grams per cubic centimeter (g/cm³).

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What are valence electrons?

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Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

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What is the significance of Group 15 in the periodic table?

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Group 15 elements, also known as the nitrogen group, have five valence electrons and include nitrogen, phosphorus, arsenic, antimony, and bismuth.

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What is a chemical reaction?

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A chemical reaction is a process that involves the transformation of one or more substances into different substances, involving the breaking and forming of chemical bonds.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

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What are metals, nonmetals, and metalloids?

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Metals are elements that are good conductors of heat and electricity, nonmetals are poor conductors, and metalloids have properties of both.

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What is a gas?

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A gas is a state of matter that has no fixed shape or volume and expands to fill its container.

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What is a reactant?

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A reactant is a substance that undergoes a chemical change in a reaction.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

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What is thermal energy?

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Thermal energy is the energy that comes from the temperature of matter; it is the total kinetic energy of particles in a substance.

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