59 Which statement describes one of the main differences between a physical and a chemical change? A A chemical change involves reactants and products, whereas a physical change involves only reactants. B A physical change is a change of state, whereas in a chemical change the substance keeps the same form. C A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance. D A chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed. 60 Which of the following is a physical change? A iron rusting under water B copper turning green in the air C Benzoic acid sublimating into a gas D hydrogen and oxygen producing water

Answer 1

For question 59, the correct answer is C: A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.

For question 60, the correct answer is C: Benzoic acid sublimating into a gas. This process is a physical change because it involves a change of state from solid to gas without altering the chemical composition of the substance.

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