2025_Chemical Reactions Review

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What is a combustion reaction?

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A combustion reaction is a chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light and heat. It typically involves hydrocarbons reacting with oxygen to produce carbon dioxide and water.

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What does it mean to balance a chemical equation?

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Balancing a chemical equation means ensuring that the number of atoms of each element is the same on both sides of the equation, reflecting the law of conservation of mass.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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What is the difference between a physical change and a chemical change?

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A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different properties.

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What is a synthesis reaction?

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A synthesis reaction is a type of chemical reaction in which two or more reactants combine to form a single product.

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What is a single replacement reaction?

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

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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 products.

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What is the evidence of a chemical reaction?

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Evidence of a chemical reaction can include color change, temperature change, gas production, and the formation of a precipitate.

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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.