Name Period ____ Date ______ Chapter 10 Review Worksheet

Name ___________________ Period ____ Date __________ Chapter 10 Review Worksheet Directions: Please complete on a separate piece of paper. Answer any non-math problems in complete sentences. This will be graded on correctness and not completeness. 1. Ethanol has a specific heat of 2.44 J/gŸ°C. What does that mean? 2. How many joules are absorbed in a process that absorbs 0.5720 kcal? 3. To vaporize 2.00 g of ammonia, 656 calories are required. How many kilojoules are required to vaporize the same mass of ammonia? 4. A 25.0 g bold made of an alloy absorbed 250 J of heat as its temperature changed from 25.0 °C to 78.0 °C. what is the specific heat of the alloy? 5. When a 58.8 g piece of hot alloy is placed in 125 g of cold water in a calorimeter, the temperature of the alloy decreases by 106.1 °C, while the temperature of the water increases by 10.5 °C. What is the specific heat of the alloy? 6. Classify these process as exothermic or endothermic a. Condensing steam b. Evaporating alcohol c. Burning alcohol d. Baking a potato 7. Sodium acetate dissolves readily in water according to the following equation. NaC2H3O2 (s) à NaC2H3O2 (aq) ΔH = - 17.3 kJ Classify this process as either endothermic or exothermic and describe if the temperature of the water would increase or decrease. 8. Calculate the heat change for the formation of lead (IV) chloride by the reaction of lead (II) chloride with chlorine. Overall: PbCl2 (s) + 2Cl2 (g) → PbCl4 (l) ΔH = ?

Equ. 1: Pb(s) + 2Cl2 (g) → PbCl4 (l)

ΔH = -339.2 kJ

Equ. 2: Pb(s) + Cl2 (g) → PbCl2 (s)

ΔH = -359.4 kJ

Challenge Problems: 9. 41.0 g of glass at 95 °C is placed in 175 g of water at 21 °C in an insulated container. They are allowed to come to the same temperature. What is the final temperature of the glass-water mixture? The specific heat of glass is 0.840 J/gŸ°C. 10. Ethane [C2H6 (g)] can be formed by the reaction of ethene [C2H4 (g)] with hydrogen gas. C 2 H 4 (g) + H 2 (g) → C 2 H 6 (g) Use the heats of combustion for the following reactions to calculate the heat change for the formation of ethane from ethene and hydrogen gas. 2H 2 (g) + O 2 (g) → 2H 2 O(l) ΔH = −572 kJ

C 2 H 4 (g) + 3O 2 (g) → 2H 2 O(l) + 2CO 2 (g) ΔH = −1401 kJ 2C 2 H 6 (g) + 7O 2 (g) → 6H 2 O(l) + 4CO 2 (g) ΔH = −3100 kJ