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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

energy flows out of the system, change in internal energy is ____

negative