Question

in a sealed container, when temperature increases:
a. pressure increases.
b. pressure decreases.
c. volume decreases.
d. energy stays the same.

Explanation:

In a sealed container, volume is constant (since it's sealed, so volume doesn't change, eliminating option c). According to the ideal gas law ($PV = nRT$), when temperature ($T$) increases (with $V$, $n$, $R$ constant), pressure ($P$) must increase. For option d, increasing temperature means the kinetic energy of gas particles increases, so energy doesn't stay the same. So the correct option is a.

Answer:

a. pressure increases.