Question

question 4
1 pts
state whether each of the following is a physical or chemical change.
sodium chloride melts at 1413 c choose
n2o2(g) --> n2(g) + o2(g) choose
aka seltzer bubbles vigorously when placed in a glass of water choose

Explanation:

1. Melting of sodium chloride is a physical change as it only changes the state from solid to liquid without altering the chemical composition.
2. The decomposition of $N_2O_2$ to $N_2$ and $O_2$ is a chemical change as new substances are formed through a chemical reaction.
3. When Aka Seltzer bubbles in water, a chemical reaction occurs between the ingredients in the tablet and water to produce carbon - dioxide gas, so it is a chemical change.

Answer:

1. Physical change
2. Chemical change
3. Chemical change