2nd 9 weeks Review: Law of Conservation and Chemical Changes

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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 substances that undergo change during a chemical reaction, present at the start of the 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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What happens to the mass of a substance during a chemical change?

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The mass remains constant; it is conserved, even though the substance may change form.

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into different substances with new chemical and physical properties.

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What is the difference between a mixture and a compound?

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A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond together.

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How can you identify a chemical reaction has occurred?

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

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What is the significance of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in a reaction, helping to balance the equation.

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How do you determine the number of atoms in a chemical formula?

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Count the subscripts in the formula; if no subscript is present, it is understood to be one.

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What is a balanced chemical equation?

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A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, reflecting the Law of Conservation of Mass.