Quiz. S8P1f. Conservation of Matter in Reactions

Which of the following best describes the conservation of matter in a chemical reaction?

• Matter is created during a chemical reaction.

• Matter is destroyed during a chemical reaction.

• Matter is conserved; the total mass of reactants equals the total mass of products.

• Matter is converted into energy during a chemical reaction.

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• The number of oxygen atoms

• A subscript

• The number of molecules produced

• The atomic mass

Explain why the mass of the products in a chemical reaction is equal to the mass of the reactants.

• Because energy is absorbed during the reaction.

• Because atoms are rearranged but not created or destroyed.

• Because new atoms are formed during the reaction.

• Because the reaction occurs in a closed system.

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• 2 hydrogen atoms in reactants and 2 in products

• 4 hydrogen atoms in reactants and 4 in products

• 4 hydrogen atoms in reactants and 2 in products

• 2 hydrogen atoms in reactants and 4 in products

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• The claim is correct because some mass is lost as energy.

• The claim is incorrect because mass is conserved in chemical reactions.

• The claim is correct because sodium is heavier than sodium chloride.

• The claim is incorrect because chlorine is lighter than sodium chloride.

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• They indicate the number of molecules involved in the reaction.

• They show the mass of each substance.

• They represent the speed of the reaction.

• They determine the energy change in the reaction.

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What indicates that mass is conserved in a chemical reaction?

• Different products are formed

• The temperature changes

• Equal numbers of atoms on both sides

• The color changes

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Why is it important to balance chemical equations in terms of the conservation of matter?

• To ensure the reaction occurs faster.

• To ensure the same number of each type of atom is present on both sides of the equation.

• To ensure the products are more stable than the reactants.

• To ensure the reactants are completely used up.

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• 3 carbon atoms in reactants and 3 in products

• 8 carbon atoms in reactants and 8 in products

• 5 carbon atoms in reactants and 5 in products

• 3 carbon atoms in reactants and 2 in products

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