10. What kind of energy is stored within a chemical substance? 1

10/1/13
Chem Test #1 Do Now # 2
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1. 5. In which sample are the particles arranged in a regular
geometric pattern?
A 10-gram sample of water will lose the greatest amount of
heat when its temperature is changed from 50°C to
1. HCl( )
2. NaCl(aq)
3. N2 (g)
4. I2 (s)
1. 10°C 3. 30°C
2. 20°C 4. 40°C
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6. 2. Which temperature represents absolute zero?
In which beaker would the particles have the highest average
kinetic energy?
1. 0 K 3. 273 K
2. 0°C 4. 273°C
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7. 1. 2. 3. 4. --------------
Which unit is used to express the amount of energy absorbed
or released during a chemical reaction?
1. degree 3. gram
2. torr
3. What occurs when the temperature of 10.0 grams of water is
changed from 15.5°C to 14.5°C?
1. The water absorbs 42 joules.
2. The water releases 42 joules.
3. The water absorbs 4200 joules.
4. The water releases 4200 joules.
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4. joules
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8. Which material is a mixture?
1. water 3. methane
2. air
4. magnesium
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4. An example of a heterogeneous mixture is
1. soil
3. carbon monoxide
2. sugar 4. carbon dioxide
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9. The temperature of 15 grams of water increased by 3.0°C.
How much heat was absorbed by the water?
1. 150 J 3. 18.9 J
2. 45 J 4. 189 J
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10. What kind of energy is stored within a chemical substance?
1. free energy
3. kinetic energy
2. activation energy
4. potential energy
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10/1/13
Chem Test #1 Do Now # 2
Answer Key for Chem Test #1 Do Now # 2
1. 4 5. 1 9. 4
2. 3 6. 1 10. 4
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