| Chapter 16 Test | ||||||||||||||||||||||
| Get your paper and pencil ready! Now let us see if you really have the chemistry skills... |
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| 1. What is the law of conservation of energy? a. the energy stored in a substance because of its composition b. the amount of heat required to raise the temperature of one gram of pure water by one degree celsius c. states that in any chemical reaction or physical process, energy can be converted from one form to another, but it is neither created nor destroyed |
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| 2. If an endothermic process absorbs 256 J, how many kilocalories are absorbed? a. o kcal b. 567 kcal c. .0612 kcal |
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| 3. A 50 g substance loses 23 calories of heat energy when the temperature falls from 35�C to 20�C. What is the specific heat of the substance? a. 0.03 cal/g�C b. 7.8 cal/g�C c. 234.7 cal/g�C |
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| #3 Please refer to the information linked here |
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| 4. The temperature of a sample of water increases from 20.0 degrees Celsius to 40.0 degrees Celsius as it absorbs 5650 J of heat. What is the mass of the sample? a. 34.5 J b. 4520 J c. 98543 J |
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| 5. What is thermochemistry? a. the heat content of a system at a constant pressure b. everything in the universe other than the system c. the study of heat changes that accompany chemical reactions and phase changes |
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| 6. What is the enthalpy of combustion? a. a balanced chemical equation that includes the physical states of all reactants and products and the energy change, usually expressed as a change in enthalpy b. the enthalpy change for the complete burning of one mole of a substance c. the heat required to melt one mole of a solid substance |
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| 7. The gas phase reaction HCl + Br Cl + HBr is endothermic. This implies that
A. (change in) H for the reaction is negative B. (change in) H for the reaction is negligable C. (change in) H for the reaction is positive |
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| 8. What is Hess' Law? a. states that if you can add two or more thermochemical equations to produce a final equation for a reaction, then the sum of the enthalpy changes for the individual reactions is the enthalpy change for the final reaction b. states that is you add one or more thermochemical equation to produce a singular equation for the reaction, then the product of the enthalpy changes for the combined reactions is the enthalpy change for the second reaction c. is defined as the change in enthalpy that accompanies the formation of one mole of the compoound in its standard state from its constituent elements in their standard state |
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| Test Continued... | ||||||||||||||||||||||