If the pressure on a gas is increased, then its volume will decrease because the gas molecules will be pushed closer together. did the data support the hypothesis (above)? justify your answer. sample justification: as weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. the weight and the surface area of the plunger were used to calculate pressure. as more weight was added, the pressure increased. the volume decreased in response. did you mention that adding weight increased the pressure? did you mention that volume decreased as the pressure increased?

The kinetic theory of ideal gases for a closed system postulates that:

I.The gas molecules move randomly in straight lines colliding with each other and with the walls of the containing vessel. This collision of the gas molecules with the walls of the container creates the gas pressure.

II.The collision of the gas molecules is perfectly elastic.

III.The actual volume occupied by the gas molecules themselves is negligible, relative to the volume of the container.

IV.The cohesive forces between the gas molecules are negligible.

V.Temperature of the gas is a measure of the average kinetic energy of the gas molecules.

Also, Robert Boyle in his contribution stated that:

At constant temperature, the volume of a fixed mass of a gas is inversely proportional to its pressure.

This inverse relationship between volume and pressure means that an increase in gas volume will subsequently decrease the gas pressure and a decrease in the volume of the gas will lead to a higher pressure.

Pressure, P = Force/Area

Also, recall that force is any pull or push, and weight is a type of force since both weight and force are measured in Newton (N).

So, as weight is added per unit area, pressure will build up and there will be decrease in the syringe air volume. With the addition of more weight, there will be a decrease in surface area and hence the value of the gas pressure becomes higher. This is as a result of a decrease in volume as the air gases now have lesser space and more collisions with the inner walls of the syringe, leading to a higher gas pressure.

Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressure. As more weight was added, the pressure increased. The volume decreased in response.

Explanation:

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