Graph Interpretation
What does the x intercept represent on a graph of volume and temperature in C? Give the number and the name for this point
-273*C, absolute zero
DAILY DOUBLE!!!!!
What is another name for a groundhog?
A woodchuck (they are the exact same thing)
The temperature of a 500 mL sample of gas is at 250 K. The gas is heated to twice the temperature, 500 K. What will the volume of the gas be?
1000 mL (1L). If Kelvin temp doubles then volume will double!
System: Gas
State 1: Gas is at room temperature
State 2: Fire has heated gas up to 2x the original kelvin temperature
Thermal energy should increase
fire should input energy
The goal of the lab was to....
Measure the thermal contraction of a gas
ALSO accepted:
Measure volume and temperature of a gas
Whatever volume the gas takes up at 0*C
Create particle diagrams for the cooling of a gas from room temperature to 0 *C
arrows shorter
Either more particles for an equal volume or a smaller box with the same number of particles
Ms. Beckman filled her car tire up with 10 L of air this summer when it was 85*F (29.4*C) outside. This morning when it was 48*F (8.8*C), her tire looked a little flat. Assuming there was no leaks, what volume was the gas in the tire taking up on the cold morning?
9.32 L
DAILY DOUBLE!!!!
What is the only letter in the alphabet that is not on the periodic table?
The letter J
DAILY DOUBLE!!!!
Who is Ms. Poole's favorite teacher at Norwalk?
Ms. Beckman (duh)
The graph shown to the right was collected with a 500 mL flask. How would the graph change if the lab were done with a 1000 mL flask instead?
The slope would increase (double)
Create particle diagrams for the heating of a gas from room temperature to 100*C
Arrows longer
larger box with the same number of particles
OR
Same volume with less particles
On a trip from florida, where the temperature was 45*C to Colorado in the winter, where the air temperature was -17.7*C, a traveler noticed that their 1L bag of chips went from looking very full to looking a bit deflated. What volume (in mL) is the gas in the bag taking up after traveling to colorado and sitting in the air temperature?
There are 1000 mL in 1 L
0.8 L
A gas is heated in a chamber using a heat lamp. It starts off at 0.0005 K (S1). It is then heated to 150 K (S2). The heat lamp is then turned off and the gas starts to cool back down halfway to it's original temperature (S3)
EQ increases and then decreases
Heat lamp inputs energy
Energy transfers out to surroundings
The change in volume of the gas was determined by....
How much water was sucked into the flask when it was dunked in the cold water
A group forgot to put the stopper in their flask and let some water come out when they measured their initial volume. What change would this cause on the graph to the right?
it would cause the slope to be steeper (as long as graph shows this, answer is accepted)
Draw 3 particle diagrams for the air inside a hot air balloon while the balloon is on the ground, while it is at its maximum height, and while it is halfway to the ground.
All changes were due to a balloon conductor using a furnace to heat the gas
Arrows short, then long, then medium
Either change the volume or the number of particles, NOT BOTH!
Predict the temperature change required to change the volume of a gas from 5L to 0.97L assume it is starting at room temperature (25*C)
CHANGE = -241 K
Final temperature = 57 K
(not technically what the question asked for, 1/2 points for giving the final temp)
EQ should increase
Fire should input energy
The initial (hot) volume of the gas was determined by
Filling up the flask with water and then measuring how much water was in the flask
A group forgot to close their stopper before taking the gas out of the hot water, causing the gas to contract slightly and suck in some air. What very specific change would this cause in the x intercept of a graph of volume v. temperature in celsius.
Gas will be a larger starting volume than what it should've been, meaning the gas will contract MORE than it should, leading to a larger slope and a less negative x-intercept
Predict the final temperature in fahrenheit of a 500 mL sample of gas that starts at 20 *F and is then heated until its volume reaches 20L
There are 1000 mL in 1L
18,721*F
10,656 K
System: Air in hot air balloon, Air balloon (not including the furnace), ground
State 1: A hot air balloon has turned on it's furnace and the balloon is inflated, but the hot air balloon is not off the ground yet
State 2: The furnace has heat the air balloon and they are now high up in the air
State 3: The balloon conductor has left the furnace off to allow the balloon to descend to half their original height.
Furnace inputs energy in first circle, energy transfers to surroundings in 2nd circle
Thermal energy increases then decreases
Gravitational increases then decreases
Ek increases and stays constant (we can assume, not a dealbreaker if it does not stay constant)
A group did the following steps in their lab after removing the gas from the hot water with the stopper closed:
1. Very carefully dunked the flask upside down into the the ice cold water
2. Wait 5 minutes
3. Open the stopper of the flask and wait a few seconds.
4. Removed the flask from the water.
5. Measured the volume of water in the flask.
Then continued on with the lab correctly.
What did they do wrong in this procedure?
Forgot to measure the temperature of the cold water
Forgot to close the stopper before removing from the water