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Questions and Answers
Which of the following statements about chemical reactions is correct?
Which of the following statements about chemical reactions is correct?
- Chemical reactions only involve the formation of new substances.
- Chemical reactions do not involve any changes in energy.
- Chemical reactions can only occur in a laboratory setting.
- Chemical reactions involve the breaking and formation of chemical bonds. (correct)
What is the purpose of a chemical equation?
What is the purpose of a chemical equation?
- To show the total number of atoms in a reaction.
- To balance the mass and charge of reactants and products. (correct)
- To describe the physical appearance of reactants and products.
- To indicate the temperature at which the reaction occurs.
What happens to the total mass of substances during a chemical reaction?
What happens to the total mass of substances during a chemical reaction?
- The total mass of substances always decreases.
- The total mass of substances remains constant. (correct)
- The total mass of substances depends on the temperature of the reaction.
- The total mass of substances always increases.
