Specific Heat Worksheet

KINETICS LAB ALTERNATE ASSIGNMENT q=(mass)(Csp)(∆T) Units for specific heat = __J___ g ∙ °C

1. What is the specific heat of a substance that absorbs 2.5 x 103 joules of heat when a sample of 1.0 x 104 g of the substance increases in temperature from 1.0°C to 70.0°C?

2. How many grams of water would require 2.20 x 104 joules of heat to raise its temperature from 34.0°C to 80.0°C? The specific heat of water is 4.18 J/g∙°C

3. If 200. grams of water is to be heated from 14.0°C to 100.0°C to make a cup of tea, how much heat must be added? The specific heat of water is 4.18 J/g∙°C

4. A block of aluminum weighing 140. g is cooled from 98.4°C to 32.2°C with the release of 1080 joules of heat. From this data, calculate the specific heat of aluminum.

5. A cube of gold weighing 192.4g is heated from 30.0°C to some higher temperature, with the absorption of 226 joules of heat. The specific heat of gold is 0.030 J/g∙°C. What was the final temperature of the gold?

6. A total of 54.0 joules of heat are absorbed as 58.3 g of lead is heated from 10.0°C to 45.0°C. From these data, what is the specific heat of lead?

7. The specific heat of wood is 2.03 J/g∙°C. How much heat is needed to convert 550. g of wood at -10.0°C to 18.0°C?

8. What is the total amount of heat needed to change 2.25 kg of silver at 0.0°C to 150.0°C? The specific heat of silver is 0.129 J/g∙°C

9. Granite has a specific heat of 800. J/g∙°C. What mass of granite is needed to store 1.50 x 106 J of heat if the temperature of the granite is to be increased by 25.5°C?

10.A 55 kg block of granite has an original temperature of 35.0°C. What will be the final temperature of this granite if 4.5 x 104 kJ of heat energy are added to the granite?

11. Which is more effective in cooling a drink, 10 grams of water at 0°C or 10 grams of ice at 0°C? Explain your answer quantitatively. Kinetics Review Questions 12.Define rate of reaction

13.What are the units of the rate of reaction?

14.Draw a graph that shows the concentration of products with time as a reaction goes to completion. Explain the shape of the graph.

15.On the same graph, using a different color or dotted line, show how the concentration of products changes with time when a catalyst is added.

16.Draw a graph that shows the concentration of reactants with time as a reaction goes to completion. Explain the shape of the graph.

17.On the same graph, using a different color or dotted line, show how the concentration of reactants changes with time if a lower concentration (through an increased volume so that the total number of moles is the same) is used.

18.True or false: All collisions result in a reaction.

19.What are the 4 parts of collision theory and why is it important?

20.Give two reasons why a collision would not result in a reaction

21.The reaction between nitrogen and oxygen in the atmosphere under normal conditions is extremely slow. Which statement best explains this?

A. The concentration of oxygen is much lower than that of nitrogen B. The molar mass of nitrogen is less than that of oxygen C. The frequency of collisions between nitrogen and oxygen molecules is lower than that between nitrogen molecules themselves D. Very few nitrogen and oxygen molecules have sufficient energy to react

22.List 4 factors that affect reaction rates

23.Define activation energy

24.Does activation energy change with temperature?