b. potassium reacts with water
d. a rotting apple
f. evaporation of water
g. sublimation of dry ice
h. dissolve sugar in water
i. a growing flower
j. hydrogen is a flammable gas
2. Which of the following are chemical changes?
a. mercury has a density of 13600 kg/m3
b. potassium reacts with water
c. hammer a nail into a piece of wood
d. a rotting apple
e. potassium is a soft metal
f. evaporation of water g. sublimation of dry ice
h. dissolve sugar in water
i. a growing flower
j. hydrogen is a flammable gas
3 answers
are these answers correct?
Yes, the answers given are correct. Potassium reacting with water, a rotting apple, and a growing flower are examples of chemical changes because they involve the formation of new substances as a result of chemical reactions.