Chemical Reactions

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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. Examples include melting, freezing, and dissolving.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves breaking and forming bonds between atoms.

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What is a decomposition reaction?

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A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler substances.

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What is a synthesis reaction?

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A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex substance.

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What is a single replacement reaction?

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A single replacement reaction is a type of chemical reaction where one element replaces another element in a compound.

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What is a double replacement reaction?

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A double replacement reaction is a type of chemical reaction where the anions and cations of two different compounds exchange places, forming two new compounds.

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What does it mean for a chemical equation to be balanced?

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A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

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What is evidence of a chemical reaction?

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Evidence of a chemical reaction includes the formation of a new substance, color change, gas production, or temperature change.

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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; it is conserved.

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What is an example of a physical change?

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An example of a physical change is water freezing into ice.