Question 1
Which of the following is a physical change?
◦ the freezing of water to form ice
◦ the burning of paper
◦ the sodium metal reacts vigorously with water
◦ the reaction of zinc with hydrochloric acid
◦ the inability of gold to react with water
Question 2
Which of the following is a physical property?
◦ the density of lead
◦ sulfur burns in oxygen to form sulfur trioxide
◦ ozone reacts with silver to give silver oxide
◦ platinum metal does not react with hydrochloric acid