Chemistry, 06.03.2021 22:50 coryowens44

1. Materials expand when they heat up and contract when they cool down. Steel gaps are often placed in bridges to compensate for this. Steel is mostly iron. Determine the specific heat of iron if 10g of iron releases 114J of heat energy when it cools from 50.4°C to 25.0°C.

2. The temperature of 34.4g of ethanol increases from 25°C to 78.8°C. How much heat is absorbed by this system?

3. A piece of copper is in some snow at -8.0°C. It is picked up by someone and warmed to body temperature of 37°C. If the mass of the copper is 3.1g, how much heat is absorbed?

4. Determine the mass of water that absorbs 5650J when the temperature increases from 20°C to 46.6°C.

5. What is the final temperature of 335g of water that loses 9750J of heat. The initial temperature of the water is 65.5°C.

6. A 4.7g chunk of matter looks like gold. When its temperature increases from 25°C to 57°C, it absorbs 57.2J of heat energy. Prove that the substance is or is not gold.

7. Determine the final temperature of a 55g aluminum block that begins at 27.5°C and absorbs 725J of heat energy.

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