Chemical Reactions

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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 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 rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

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What are reactants in a chemical equation?

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Reactants are the starting substances that undergo a chemical change in a reaction.

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What are products in a chemical equation?

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Products are the substances that are formed as a result of a chemical reaction.

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What does a coefficient in a chemical equation represent?

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A coefficient indicates the number of molecules of each reactant and product involved in the reaction.

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What is evidence of a chemical reaction?

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

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What is combustion?

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Combustion is a chemical reaction that occurs when a substance reacts rapidly with oxygen, producing heat and light.

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What is a phase change?

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A phase change is a physical change that occurs when a substance changes from one state of matter to another, such as solid to liquid.

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What is a mixture?

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A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.