Physical Science MCAS Review (Chemistry) 2021

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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 the reactants equals the total mass of the products.

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties.

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What is a compound?

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A compound is a substance formed when two or more different elements chemically bond together.

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What is conduction?

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Conduction is the transfer of heat through direct contact between materials.

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What is a mixture?

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A mixture is a combination of two or more substances where each retains its own properties.

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What is heat transfer?

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Heat transfer is the movement of thermal energy from one object or substance to another.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

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What is evidence of a chemical change?

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Evidence of a chemical change includes color change, gas production, formation of a precipitate, or temperature change.

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What is an example of heat transfer by conduction?

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An example of heat transfer by conduction is rocks buried in sand absorbing heat from the surrounding sand.