1. 1) vocab word--the quantity of heat needed to raise the temperature of 1 g of water 1°C 2) vocab word--the amount of energy required to raise the temperature of 1 g of a substance 1°C 1)calorie 2)specific heat capacity

2. 1) vocab word--the amount of energy required to raise the temperature of 1 mol of a substance 1°C 2) vocab word--the study of heat changes that accompany chemical reactions 1)molar heat capacity 2)thermochemistry

3. 1) vocab word--a food calorie 2) vocab word--the SI unit of heat 3) vocab word--chemical reactions that include a heat term 1)Calorie 2)Joule 3)thermochemical equation

4. 1) vocab word--a device used to measure the amount of heat absorbed or released during chemical or physical process 2) vocab word--the accurate and precise measurement of heat change for chemical and physical processes 1)calorimeter 2)calorimetry

5. 1) vocab word--measurement of heat when using constant- pressure calorimetry 2) vocab word--form of energy that always flows from a warmer object to a cooler object 1)enthalpy 2)heat

6. 1) vocab word—process that absorbs or gains heat from the surroundings 2) vocab word—the ability or capacity to do work 1)endothermic 2)energy

7. 1) vocab word– the heat change caused by the dissolution of one mole of a substance 2) vocab word—the change in enthalpy that accompanies the formation of 1 mole of a compound from its elements 1)Molar heat of solution 2)Standard heat of formation

8. 1) vocab word—the heat absorbed by 1 mole of a substance in melting from a solid to a liquid 2) vocab word—the amount of heat necessary to vaporize 1 mole of a given liquid 1)Molar heat of fusion 2)Molar heat of vaporization

9. 1) vocab word—process that releases or loses heat to the surroundings 2) vocab word—states that if you add two or more thermochemical equations to give a final equation, then you can add the heats of reaction to give the final heat of reaction 1)exothermic 2)Hess’s Law

10. Endothermic or Exothermic? exothermic

11. endothermic

12. exothermic

13. endothermic

14. endothermic

15. exothermic

16. exothermic

17. endothermic

18. Endothermic or Exothermic endothermic

19. Endothermic or Exothermic? exothermic

20. 4 NO(g) + 6 H 2 O(l) → 4 NH 3 (g) + 5 O 2 (g) ΔH = +1170 kJ endothermic NH 3 (g) + HCl(g) → NH 4 Cl(s) ΔH = −176 kJ exothermic

21. Endothermic or Exothermic? H 2 (g) + ½ O 2 (g) → H 2 O(g) + 286 kJexothermic HgO (s) + 90.7 kJ → Hg (l) + ½ O 2 (g)endothermic

22. A certain mass of water was heated with 41,840 Joules, raising its temperature from 22.0 °C to 28.5 °C. Find the mass of water. The specific heat of water is 4.184 J/(g·C°).

23. If it takes 41.72 joules to heat a piece of gold weighing 18.69 g from 10.0 °C to 27.0 °C, what is the specific heat of the gold?

24. Given that the specific heat capacity of gold is 0.131 J/(g·C°), find its molar heat capacity.

25. The temperature of 110 mL of water rises from 25.0°C to 26.2°C when 0.10 mol of H + is reacted with 0.10 mol of OH -. Calculate the amount of heat released. Assume that the denisty of the solution is 1.00 g/mL. The specific heat of water is 4.184 J/(g·C°).

26. How much heat energy is obtained when 1 kg of ethane gas, C 2 H 6, is burned in oxygen according to the equation: 2C 2 H 6 (g) + 7O 2 (g) → 4CO 2 (g) + 6H 2 O(l); ΔH = –3120 kJ

27. Determine the energy required to boil 43.89 grams of water at 100.0 °C. The ∆H vapor of H 2 O is 40.67 kJ/mol.

28. What is the value for ΔH for the following reaction? CS 2 (l) + 3 O 2 (g) → CO 2 (g) + 2 SO 2 (g) Given: C(s) + O 2 (g) → CO 2 (g); ΔH = -393.5 kJ S(s) + O 2 (g) → SO 2 (g); ΔH = -296.8 kJ C(s) + 2 S(s) → CS 2 (l); ΔH = 87.9 kJ Hess’s Law, double 2 nd rxn, reverse 3 rd rxn  H = -1075 kJ

29. CH 4 (g) + 2O 2 (g) → CO 2 (g) + 2H 2 O(l) ∆H° = –889.1 kJ ∆H f ° H 2 O(l) = –285.8 kJ/mol ∆H f ° CO 2 (g) = –393.3 kJ/mol What is the standard heat of formation of methane, ∆H f ° of CH 4 (g), as calculated from the data above? −889.1 = [−393.3 + 2(−285.8)] −[x + 2(0)] x = ∆H f ° of CH 4 (g) = −75.8 kJ/mol