Unit 4 Vocabulary Flashcards Preview

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Flashcards in Unit 4 Vocabulary Deck (14)
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1

Thermodynamics

Study of energy and interconversions

2

First law Thermodynamics

Total energy of the universe is constant

3

Internal Energy (E)

Sum of kinetic/potential energies of all particles that compose the system

4

Energy Flow in Two Points

(1) If reactants have higher internal energy than products, Esys is negative (2) If reactants have lower internal energy than products, Esys is positive--E flows into system

5

Internal Energy of System Equation

[triangle]E = q + w - q = heat - w = work done

6

Heat Capacity

Quantity of heat required to change its temperature by 1 degree C; extensive property

7

Specific Heat Capacity (Cs)

- Amount of heat required to raise the temperature of 1 gram of the substance by 1C

- Specified by units J/g•C

8

Pressure-Volume Work

- Occurs when force is caused by volume chnage against an external pressure

9

Pressure

- Force that pushes against cylinder divided by area of cylinder

10

Calorimetry

- Measure of thermal energy of the reaction and surroundings exchange by observing cahnge in temperature of surroundings 

11

Enthalpy

- Sum of internal energy and product of its pressure and volume

12

Endothermic Reaction

- Reaction that absorbs heat from its surroundings (+ [triangle]H)

 

13

Exothermic Reaction

- Gives off heat to surroundings

- -[triangle]H

14

Internal Energy

- Sum of its kinetic energy and potential energy