Heat Review Game!

1. Heat Review Game! Rules: Every turn the white board and marker MUST be passed to the next team member. You may help your team members but only the person who’s turn it is may use the marker. You must show your work! (when appropriate) Every team should answer. The first team to answer correctly gets five points. The second gets four etc. If we get too loud or disrespectful we will stop and work on our review questions.

2. What state is represented by part 1? Solid

3. Define heat • Heat is the amount of energy in a substance.

4. Define Exothermic • Energy travels from the system to the surroundings.

5. 50 g of steam is cooled from 140 °C to 80 °C. How much energy is released? • Hf= 80 cal/g • Hv= 540 cal/g • Csteam = 0.4 cal/g °C • Cliquid= 1.0 cal/g °C • Cice = 0.5 cal/g °C • q = m x C x ΔT • q = H x mol q = m x C x ΔT q = 50 g x .4 cal/g °C ( 100 -140 °C) q = - 800 cal q = H x m q = 540 cal/g x 50 g q = 27000 cal q =27000 + 800 q = -27800 cal

6. 10 g of water is cooled from 95°C to 45°C? How much energy is released? • Hf= 80 cal/g • Hv= 540 cal/g • Csteam = 0.4 cal/g °C • Cliquid= 1.0 cal/g °C • Cice = 0.5 cal/g °C • q = m x C x ΔT • q = H x mol q = m x C x ΔT q = 10 g x 1.0 cal/g °C x (45 °C -95 °C) = -500 cal

7. What is represented by part 2? (be specific) Phase change between liquid and solid

8. What phase change occurs during condensation? • Gas to liquid

9. 10 g of steam is heated from 105°C to 235°C? How much energy is needed? • Hf= 80 cal/g • Hv= 540 cal/g • Csteam = 0.4 cal/g °C • Cliquid= 1.0 cal/g °C • Cice = 0.5 cal/g °C • q = m x C x ΔT • q = H x m q = m x C x ΔT q = 10g x .4 cal/ g °C x (235 °C -105 °C) q = 728 cal

10. What state is represented by part 3? Liquid

11. Sublimation occurs when: • A solid goes into the gas phase without going through the liquid phase.

12. Define temperature. • Temperature is a measure of the average kinetic energy of the molecules.

13. Ice is cooled from 0°C to -50°C. Is this process endothermic or exothermic? • Exothermic

14. While melting, matter goes from the ____ state to the _______ state. • Solid to the liquid

15. 15 g of liquid water at 0 °C is frozen and then cooled to -25 °C. How much energy was released? • Hf = 80 cal/g • Hv= 540 cal/g • Csteam = 0.4 cal/g °C • Cliquid = 1.0 cal/g °C • Cice = 0.5 cal/g °C • q = m x C x ΔT • q = H x mol q = H x mol q = 15 g x 80 cal/g q = 1200 cal q = m x C x ΔT q = 15g x 0.5 cal/g °C x (-25 °C-0 °C) q = - 1875 cal q q = -1200cal + -1875 cal q = - 3075 cal

16. What is represented by part 4? Phase change between liquid and gas

17. What state is represented by part 5? Gas

18. Define specific heat. • Specific heat is the amount of energy need to raise the temperature of 1 gram of a substance 1 °C.

19. As a substance goes through section 2, what happens to the distance between the particles? • They spread apart.

20. What are the names of the processes happening during section 4? • Evaporation • Condensation

21. What are the names of the processes happening during section 2? • Melting • Freezing

22. 20 g of ice is melted. How much energy is used? • Hf= 80 cal/g • Hv= 540 cal/g • Csteam = 0.4 cal/g °C • Cliquid= 1.0 cal/g °C • Cice = 0.5 cal/g °C • q = m x C x ΔT • q = H x m q = Hf x m q = 80 cal/g x 20 g q = 1600 cal

23. The temperature at which a substance in the liquid state freezes is the same as the temperature at which the substance_______. What is the name of this temperature? • Melts • Freezing point

24. In evaporation matter goes from the ____ state to the _____ state. • Liquid to the gas

25. Define Endothermic • Energy travels from the surroundings to the system.

26. What phase change occurs during freezing? • Liquid to solid