Quick Check Y9 Thermal Physics

Two Kevins bought some marshmallows. Mia and Nina Li (ofc) ate almost all of them so while there is at least some left, Liz 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

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

Nemo and Lucas Lu have blown their balloons exactly the same size (WOW, only good friends synchronize that way). Nemo places the balloon in a container with water at 10 C and Lucas Lu 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.

• Nina Chen: Balloons don't change in size

• Elsa Lin: Nemo' balloon expands and Lucas' balloon shrinks

• Ruby: Nemo' balloon shrinks and Lucas' balloon expands

• Both balloons expand

Carrie likes to make interdisciplinary links so she tries to make connections between Biology and Physics. She explains to Jean and Jennifer: "As you exhale your lungs volume is 3L at pressure 14mmHg. As you inhale, lungs expand by 0.5 L, meaning the pressure is ........? (in mmHg)

Jessica, Lizzy and Elsa Xu use 3 gas containers containing the same gas. 40 ml gas at 600 kPa (Jessica), 80 ml gas at 300 kPa (Elsa Xu) and 100 ml at 240 kPa (Lizzy). 4 students analyze the temperature of gas containers using this data. Who is correct?

• Bryan: Jessica's gas has the highest temperature

• Oscar: Elsa's gas has the highest temperature

• Alice: All gases have the same temperature

• Emily: Lizzy's gas has the highest temperature

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

Groups:

(a) Heat

,

(b) Temperature

• measured in C

• Can be measured directly

• energy

• measured in J

• how cold/hot something is

• measured in K

• needs to be derived