Question

Which of the following summertime activities consists solely of physical change?
a. making a sandcastle out of water and sand
b. letting the sun turn your skin a toasty brown
c. eating and digesting a sandwich at a picnic
d. lighting a beachside bonfire for your friends

Answer 1

a: making s sandcastle. This is because water and sand is only a mixture, so they do not react with each other. All the rest include chemical reactions!