Physics Quiz 7(Thermodynamics) Flashcards Preview

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Flashcards in Physics Quiz 7(Thermodynamics) Deck (72)
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1

What is latent heat?

When a substance changes from one state to anther, latent heat is added or released in the process.
For example:
Ice--->Vapor(latent heat of sublimation is added)
Vapor---->Ice(latent heat of deposition is released)

2

The amount of heat required to change 1 gram of ice at 0'C to 1 gram of water at 0'C is 80 calories. What is this called?

Heat of fusion of water

3

To change 1 gram of water at 100'C to water vapor at 100'C requires 540 calories of heat. What is this called?

Heat of vaporization

4

What is the process called by which water changes to its gaseous state(water vapor)?

Boiling or evaporating

5

How many calories of heat is added for ice to melt to water?

80

6

How many calories of heat are added for ice to evaporate from water to vapor?

540

7

In the warming process between 0'C and 100'C how many calories are added?

100

8

How many calories of heat are removed for water vapor to cool to the liquid form of water?

540

9

How many calories of heat are removed as water cools from 100'C to 0'C?

100

10

How many calories of heat are removed for water to freeze to a solid form of ice?

80

11

What is Sublimation, and what is an example of it?

Sublimation is the change of a solid substance directly to a vapor without first passing through the liquid state. Two examples of this is iodine and Dry Ice(solid carbon dioxide which sublimes at -78.5'C)

12

What is Deposition and what is an example of it?

Deposition is a process where a gas changes phase and turns directly into a solid without first passing through the liquid phase. One common example is snow that is formed in the clouds. Water vapor changes directly to ice without first becoming liquid.

13

What is the opposite of Sublimation?

Deposition

14

For molecules in water, what does average kinetic energy depend upon?

temperature

15

What describes the attractive and repulsive forces between water molecules that make their motion quite random?

This is known as Brownian motion

16

As greater kinetic energy(higher temperatures) is applied to water molecules what happens?

They move apart ultimately the greater kinetic energy allows them to escape individually as a vapor.

17

As smaller kinetic energy(lower temperatures) is applied to water molecules what happens?

They move closer together becoming a solid(ice).

18

What is the difference between heat versus temperature?

Temperatures can be viewed as an arbitrary numerical ranking of "hotness" or "coldness".
Heat can be viewed as energy that is transferred as a result of a temperature difference(it is an energy flow).

*When two bodies of unequal temperatures are brought into contact, a flow of heat occurs from the hot object to the cold object until the two temperatures become equal.*

19

What is the quantitative measurement of of thermal energy?

temperature

20

What is referred to as thermal energy?

heat

21

What is the equation converting Celsius to Kelvin?

K='C + 273

22

What is the equation converting Celsius to degree Fahrenheit?

'F=1.8(C')+32

23

What is the equation converting Fahrenheit to degree Celsius?

'C=('F-32)/1.8

24

What is the numerical representation of standard temperature?

273K or 0'C

25

What is another word to describe heat?

energy

26

Heat loss(energy loss) is unidirectional from what to what?

higher concentration to a lower concentration. Hotter to less hot.
The human body is a system that contains energy and there is a constant exchange of heat with the environment from high concentration to lower concentration.

27

What is a word used to describe the protective mechanisms such as vasoconstriction of peripheral vessels that slows heat loss from our bodes and vasodilation of peripheral vessels that promotes heats loss when we are exposed to a warmer environment?

Thermoregulation

28

A patient's core temp can quickly drop by the vasodilating actions of anesthetics, when is the greatest decrease seen?

the greatest decrease is in the first hour

29

Blood flow to our body's surface encourages heat loss by four primary processes, what are they?

radiation
convection
evaporation
conduction

30

Of the 4 primary process by which the body looses heat, what are the two that are most responsible for heat loss of the body?

radiation
convection