Thermochemistry Test - Specific Heat

According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?

• The total amount of energy is conserved
• The total amount of energy is less after a reaction
• Need the mass of the object to determine if energy is conserved.
• The total amount of energy is more after a reaction

Many house use electricity from solar panels to power their appliances, like a stove. Which of the following correctly describes the change in forms of energy during this process?

• Electricity - Thermal - Potential
• Light - Electricity - Thermal
• Light - Thermal - Sound - Electricity
• Thernal - Light - Electricity

4. What happens to the energy produced by burning gasoline in a car engine?

• The energy converts to heat in the exhaust.
• The energy is transformed into work to move the car.
• The energy heats parts of the engine.
• All of the above.

5a. Mr . Kline works with a piece of metal that gets very hot. He puts it into a bucket of cold water to cool down. What will happen to the temperature of the water when he puts the hot metal in it?

• The temperature of water will rise.
• The temperature of water will drop.
• The temperature of water will not change.

5b. If Mr. Kline leaves the metal in the bucket over night, when he returns in the morning, will the temperature of the water in the bucket and the temperature of the metal in the bucket be the same or different?

• Same
• Different
• There is no way to know from the data provided.

6. Temperature is

• associated with the sensation of hot and cold.
• proportional to the average kinetic energy of molecules.
• measured with thermometers.
• all of the above.

7. Which of the following statements is true?

• Energy as heat flows from a lower temperature to a higher temperature.
• Energy as heat flows from a higher temperature to a lower temperature.

9. The specific heat of nickel is 0.11 cal/gC and the specific heat of platinum is 0.03 cal/gC. Which metal would require more energy to heat?

• nickel
• platinum

10. How much heat is required to raise the temperature of 500g of water from an initial temperature of 20 oC to a final temperature of 80 oC? The specific heat of water is 1.0 cal/gC. Use the equation Q = mcΔT.

• 8.3 cal
• 10,000 cal
• 30,000 cal
• 40,000 cal

11. In a calorimeter, the energy content of a substance is calculated from measurement of the temperature change in a known mass of

• iron
• air
• water
• steel