check all of the following changes that would increase the pressure inside a tank of helium gas. heat the…

Explanation:

Step1: Recall gas - law principles

According to the ideal gas law $PV = nRT$ (where $P$ is pressure, $V$ is volume, $n$ is the number of moles, $R$ is the ideal - gas constant, and $T$ is temperature), for a fixed - volume tank of gas ($V$ is constant).

Step2: Analyze heating the tank

When we heat the tank (increase $T$), since $V$ and $n$ are constant initially, from $P=\frac{nR}{V}T$, an increase in $T$ will cause an increase in $P$.

Step3: Analyze using some helium

Using some helium to fill balloons decreases $n$. With $V$ and $T$ constant, from $P=\frac{nR}{V}T$, a decrease in $n$ will cause a decrease in $P$.

Step4: Analyze cooling the tank

Cooling the tank (decrease $T$), with $V$ and $n$ constant, from $P=\frac{nR}{V}T$, a decrease in $T$ will cause a decrease in $P$.

Step5: Analyze adding more helium

Adding more helium atoms increases $n$. With $V$ and $T$ constant, from $P=\frac{nR}{V}T$, an increase in $n$ will cause an increase in $P$.

Answer:

Heat the tank up by placing it in an oven., Add more helium atoms to the tank.