2025_Chemical Reactions Review

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What is a chemical change?

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A chemical change is a process where a substance transforms into a different substance with a new chemical composition, often accompanied by energy changes, gas production, or color change.

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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, such as changes in state, shape, or size.

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What evidence indicates a chemical reaction has occurred?

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Evidence of a chemical reaction includes the formation of a gas, a change in color, the formation of a precipitate, or a change in temperature.

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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 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 reactants in a chemical reaction?

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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 reaction?

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

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How do you balance a chemical equation?

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To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula in an equation to indicate the number of molecules or moles of that 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, typically resulting in the formation of carbon dioxide and water.