Quick Check Y9 Thermal Physics

Taku bought some marshmallows. Jeremy ate almost all of them so while there is at least some left, Sheryl took a syringe and put the marshmallow inside. By covering one end and pulling the piston away from the covered end, she changes the pressure. What happens to the marshmallow and why?

• Marshmallow expands, as pressure decreases

• Marshmallow shrinks as pressure decreases

• Marshmallow shrinks as pressure increases

• Marshmallow expands as pressure increases

Tiger is solving gas laws problem. Felix tells him the initial temperature is 289 C, 9th graders are aware to use Kelvin unit when gas laws are involved. So Tiger goes ahead and converts from C to K. Write the result he got (number only):

JJ and Linda have blown their balloons exactly the same size (WOW, only good friends synchronize that way). JJ places the balloon in a container with water at 10 C and Linda puts her balloon in the container with boiling water. They place the tiles on the top to make sure balloon is submerged. 4 students make statements about what happens to the balloons after 2 hours.

• Louie: Balloons don't change in size

• Tutu: JJ's balloon expands and Linda's balloon shrinks

• Annabel: JJ's balloon shrinks and Linda's balloon expands

• Joyce: Both balloons expand

Hans and Gauss pretend to be particles. They ran around far away from each other and then they get closer and moves only sideways. What change of state do they represent?

Sam and Mel have 2 containers of the same volume containing same amount of particles of the same gas. Sam heats her container so it's hotter than Mel's. What happens?

• Louie: Sam's gas has more pressure as there are more collisions between the particles

• Amelie: Sam's gas has more pressure as there are more collisions between the particles and the wall

• Elsa: Both gases have the same pressure

• Tiger: Mel's gas has more pressure as it exerts more force per unit of wall area

Year 9 tries to figure out the difference between heat and temperature

Groups:

(a) Heat

,

(b) Temperature

• needs to be derived

• measured in J

• how cold/hot something is

• measured in K

• measured in C

• energy

• Can be measured directly

Temperature of 2 L of gas in the sealed container is 50 C, pressure is 100kPa, it expands to 5.3 L, temperature is 323 K. What Is new pressure (in kPa, 3sf)?