Name:
Nickname:
You can use the simulator found at
https://ch301.cm.utexas.edu/simulations/js/idealgaslaw/ to help you answer the following
questions.
Chemistry Inquiry – Introduction to the Gas Laws
Review of concepts from a previous class:
1. Kinetic Molecular theory
According to the Kinetic Molecular Theory:
particles
 All matter is compose of tiny ______________
 These particle are in constant ______________
motion
2. This movement of particles has a great impact on the properties of matter.
motion
 Kinetic Energy is the energy of _______________________.
___________________
is a measure of the average Kinetic Energy of the
Temperature
particles. An increase of ________________
will increase the Kinetic Energy.
temperature
1/2mv^2
The formula to calculate Kinetic energy is Ke = _______________.
 If particles are moving in a confined place, then they will ultimately
collide
______________
with one and other.
Gas Pressure and Volume:
The box below represents a canister designed to hold a gas and measure the gas pressure.
Inside the box, place 10 gas particles, use small circles to represent them. Use arrows to
indicate the random motion of the particles.
P
What causes gas Pressure?
Collisions with walls
If there were no particles of gas in the box, what would the gas pressure be?
zero
In the diagram below, the size of the box is decreased by ½. Place the 10 particles of gas
into the smaller volume. Draw arrows to indicate random motion.
2atm
P
0 atm
10 atm
What has happened to the number of collisions? Explain.
increase
What has happened to the interior surface area? Explain.
decrease less volume
What has happened to the number of collisions against the side of the box? Explain.
increase less volume
Does this cause a change in pressure? If so, what change should be observed? Explain.
yes, increase more collions with walls
On the pressure dial above, indicate what you think the change in pressure would be.
Would go to 1 atm if started 2 atm
Using what you have learned, state a general rule for the relationship between pressure
and the volume of a gas.
PV=k P1V1=P2V2
The diagram below represents a balloon that is partially inflated at a specific temperature.
Inside balloon A, place 10 gas particles, use small circles to represent them. Use arrows
to indicate the random motion of the particles.
A
B
T = 200 K
T= 100K
What are the gas particles doing inside the balloon to give it the shape (and volume) it
has?
Colliding with the sides
In diagram B, the temperature is doubled.
What happens to the kinetic energy of the gas particles inside the balloon?
increase
What happens to the velocity of the particles inside the balloon?
Increase
What happens to the collisions between the particles and the walls of the balloon?
Increase frequence and more energetic collisions
In diagram B, the original balloon volume is drawn for your reference. Estimate the new
volume of the balloon, and draw it using the reference provided.
2 times volume
State a general rule for the relationship between the volume of a gas and the temperature.
T=kV or V1/T1=V2/T2 or directly proportional