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Flashcards in Chapter 7 Deck (17):
0

System

Contains the process under study

1

Surrounding

The rest of the universe

2

First law of thermodynamics

Energy of the universe is constant (law of conservation)

3

Each chemical bond has what?

Stored chemical energy

4

Exothermic reaction

Energy required to break the bond is less than than the energy released when the bonds are formed, net release of energy

5

Endothermic reaction

Energy required to break bonds is larger than the energy released when the bonds are formed

6

Entropy is negative you must do what?

Apply some form of energy

7

2nd law of thermodynamics

Spontaneous
Doubly tends toward increasing disorder and randomness

8

Entropy

Measure of randomness of a chemical system (no such thing as negative entropy)

9

Positive entropy means?

Increase in disorder for the reaction

10

Exothermic and positive entropy =

Spontaneous

11

Endothermic and negative entropy =

Non spontaneous

12

Free energy

Represents the combined contribution of the enthalpy n entropy values for a chemical reaction

13

Free energy predicts what?

Spontaneity of a chemical reaction

14

Calorimetry

Measurement of heat energy changes in a chemical reaction

15

Calorimeter

Measures heat changes in calories

16

Specific heat (sh)

# of calories if heat needed to raise the temperature of 1g of the substance 1degree C