Answer
a) Physical change
b) Chemical change
c) Physical change
d) Chemical change
e) Physical change
Work Step by Step
a) Due to diffusion of gas, the helium gas inside a balloon will often leak out after a few hours. During this diffusion, the chemical nature of the helium gas remains unchanged. As there is no chemical change, this must be a physical change.
b) If the flashlight beam is getting slowly dimmer, this is likely due to the dying of the battery in it. When the battery dies, this is a chemical change.
c) When water is added to frozen orange juice, the chemical nature of the orange juice is not altered. Rather, it is just diluted. This dilution is a physical change, not a chemical one.
d) During photosynthesis, the plant uses carbon dioxide, water, and the sun's energy to prepare carbohydrates. During this process, a chemical change takes place.
e) When salt is poured into a bowl of soup, it dissolves. This is a physical change, not a chemical one, because neither the chemical composition of the salt nor the soup is altered.
