Thermochemistry
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Created by:
Robert1234 on March 17, 2009
Subjects:
Description:
Flow of energy - Heat and work
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22 terms
Terms | Definitions |
|---|---|
 What area of study in chemistry is concerned with the heat transfers that occur during chemical reactions | thermochemistry |
| where the use of energy is concerned, when is work done? | work is done when a force is used to move an object. |
| what is true about energy? | energy is the capacity for doing work or suppling heat+energy is detected only because of its affects+ gasoline contains a significant amount of chemical potential energy. |
| what is true about heat? | one effect about adding heat to a substance is an increase in the temp of the substance.+ if 2 objects remain in contact,heat will flow from the warmer to the cooler. |
| what is the (system) and (surroundings) | the mixture of chemicals itself is the (system) and everthing but the mixture is the surroundings |
| In thermochemical calculations, is the direction of the heat flow given from the point of view of the system or the surroundings? | point of view |
| what universal law states that energy can neither be created or destroyed and is work, stored potential energy, or heat? | Law of conservation of energy |
| Diagram on sheet(which diagram illustrates an endothermic process?) | B |
| Diagrm A (is heat flow + or -) | neg - |
| Diagram on sheet(which diagram illustrates an exothermic process?) | A |
| Diagrm B (is heat flow + or -) | pos + |
| what does a (neg) value for heat represent? | a system is losing heat |
| page 506 17.2 (sitting by campfire=endo or exo) | endo, (absorbing) |
| page 506 17.2 ( person sweating == endo or exo) | exo, (cooling) |
| Heat generated by the human body is called? | calories |
| what generates the heat in a human body? | breakdown of sugars and fats (into)-->carbon dioxide and water |
| what is a calorie? | heat needed to raise the temp of (1 gram) of water up by (1 degree). |
| how much is a dietary (Calorie) capital c | 1000 calories --> 1 kilocalorie |
| what is the standard unit of heat and energy | Joule |
| Do samples of 2 different substances that have the same mass,,have the same heat capacity??? | no |
| 2kg frying pan or 2g steel pin, which has more heat capacity? | the frying pan ,, because of more mass |
| Does the specific heat of a substance vary with the mass of the sample? | no |
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