Flashcards in Quiz (01.15.2021) Deck (47)

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1

## we define the ___ as the material or process within which we are studying the energy changes within

### system

2

## we define the ____ as everything else with which the system can exchange energy

### surroundings

3

## a ____ is the amount of energy needed to move 1kg mass a distance of 1 meter

### joule (J)

4

## A _____ is the amount of energy needed to raise the temperature of one gram of water 1C

### calorie (cal)

5

## kcal =

### energy needed to raise 1000g of water 1C, Calories = kcal

6

## ____ is the study of energy and its interconversions

### thermodynamics

7

## the ___ energy is the sum of the kinetic and potential energies of all the particles that compose the system

### internal

8

## the change in the internal energy of a system only depends on...

### the amount of energy in the system at the beginning and end

9

## A ___ function is a mathematical function whose result only depends on the initial and final conditions not on the process used

### state

10

## when energy flows out of a system, change in energy in the system is ___

### negative

11

## when energy flows into the surroundings, change in energy in the surroundings is ___

### positive

12

## when energy flows into a system, change in energy in the system is ___

### positive

13

## when energy flows out of the surroundings, change in energy of the surroundings is ____

### negative

14

## energy is exchanged between the system and its surroundings through ___ and ___

### heat; work

15

## q and w are NOT state functions, their value depends on the process. change in energy =

### q + w (heat plus work)

16

## the heat capacity of an object is proportional to the following:

### the mass, the specific heat of the material

17

## q =

### mass (g) x specific heat capacity x temperature change (C)

18

## measure of a substance's intrinsic ability to absorb heat

### specific heat capacity - the amount of heat energy required to riase the temperature of one gram of a substance 1C

19

## Units for specific heat capacity

### J/gxC

20

## The ___ is the amount of heat energy required to raise the temperature of one mole of a substance 1C

### molar heat capacity

21

## Pressure-volume work is work caused by ...

### a volume change against an external pressure

22

## when gases exchange, change in volume is positive, but the system is doing work on the surroundings, so work of the gas is ___

### negative

23

## as long as the external pressure is kept constant, work of the gas equals...

### external pressure x change in volume of the gas

24

## conversion factor for 1 atm x L to Joules

### 1 atm x L equals 101.3 J

25

## system gains thermal energy, q (heat) is ___

### positive

26

## system loses thermal energy, q (heat) is ___

### negative

27

## work done on the system, w (work) is ____

### positive

28

## work done by the system, w (work) is ____

### negative

29

## energy flows into the system, change in internal energy is____

### positive

30