Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

SRNAChem&Physics > Gases and Work > Flashcards

Gases and Work Flashcards

1
Q

Pressure

A

W = Pressure/Area (P/A)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

SI units for volume

A

m^3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

1 m^3 = _____L

A

1000L

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Work (W) cylinder

A

P x Delta Volume (Vfinal - V initial)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Calculating work, WORK DONE is always reported in

A

Joules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Ventilator doing work for the body, operating at a constant pressure of 600Pa is used to increases the volume of air in the lungs by 00ml

A

W= 0.300 J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a calorie defined as

A

The energy necessary to raise 1 g of water 1 degree Celsius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Food calories are _______ written as a “capitalized

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

1 Calorie = _______Joules

A

4.184 Joules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

1 Kilocalories = ____Joules

A

4184 J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Kinetic energy is

A

the energy a mass has by virtue of being in motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Formula for KE =

A

1/2 m x v^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

v^2

A

sq.root of 2KE/m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Potential Energy is stored by

A

virtue of position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

NOT IMPORTANT Potential energy (PE) =

A

mgh

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Internal Energy

A

The sum of all the kinetic and potential energies in particles in a system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Internal energy represented by letter

A

“U”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Thermodynamics, definition

4 laws, cite

A

Study of how energy is converted from one form to another and how it flows in and out of as system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Zeroth law of thermodynamics

A

if 2 system are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

First law of thermodynamics:

Change in U = Q + W

A

The change in internal energy of a system equals the sum of heat (Q) flowing in or out of the system; and the work done by or on the system
change U = Q-W (change U = heat- work)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

When W is positive = (Q enters +)

When W is negative = (Q leaves gas -)

A

the system is absorbing energy or heat

the system is releasing energy or heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Compressing a gas gives the gas molecules _________

energy since they are at a higher pressure than the surrounding atmosphere.

A

potential energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

How to add internal energy in a gas

A

Heat

Change in volume (compression –>exerting a force on a distance)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Work done by the gas is

A

Work done on the gas = work done by the gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

W is (definition)

A

joules of work energy done by or on the system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

If Q > 0, process is endothermic: heat flows into system ___

A

[+Q]

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

If Q < 0, process is exothermic: heat flows out of system

A

[-Q]

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

If W < 0 work done by system on surroundings (expansion) ______

A

[-W]

29
Q

 If W > 0 work done on system by surroundings (compression) ____

A

[+W]

30
Q

Second law

A

Entropy of the university is constantly increasing

31
Q

If there is expansion, the system is doing work, energy is lost from the system so the sign for W is a _____

A

negative

32
Q

Specific heat *** unimportant

A

the amount of heat per unit mass required to raised the temperature of something by 1 degree Celsius.

33
Q

Formula of specific Heat (c)

A

c = Q / m (delta T)

34
Q

This describes the change in velocity in time

A

Acceleration

35
Q

This equals the product of an applied force times distance

A

Work

36
Q

These kinds of quantities have both magnitude and direction

A

Vector

37
Q

An object at rest remains at rest until a force act upon it

A

Newton’s First law

38
Q

This is the ability to do work

A

Energy

39
Q

The change in position with time is the

A

Velocity

40
Q

This results from the acceleration of gravity action upon an object’s mass

A

Weight

41
Q

This describes an object’s innate tendency to resist acceleration

A

INERTIA

42
Q

Force divided by area gives

A

Pressure P= F/A

43
Q

The specific heart of a good insulator should be ______WhY?

A

Large; less heat loss by the system

44
Q

Work is

A

Force x distance

45
Q

Define work

A

Expenditure of energy

46
Q

Define work

Define energy

A

Expenditure of energy

The ability to do work

47
Q

What is the formula for KE

A

1/2mv^2

48
Q

The Change in internal energy of a system ( Delta U) is equal to

A

the sum of the heat processes (Q) that cause energy to flow into/out of the system and the work done by/on the system.
Delta U = Q + W

49
Q

What is the endothermic process ? What does the system feels like Hot/cold? (change Q ? 0)

A

heat flows into the system from the surroundings . The system feels COLD. (change Q >0)

50
Q

What is the exothermic process ? What does the system feels like Hot/cold? (change Q ? 0)

A

heat flows from the system into the surroundings . The system feels WARM. (change Q < 0)

51
Q

Why does the temperature in the endothermic system drop?

A
  • Heart flows in the system of endothermic process and contributes to the total internal energy of the system.
  • Energy is necessary for an endothermic reaction to proceed and thus gets consumes in the chemical reaction. As molecules from the surroundings and the system lose KE (because it is being absorbed into the internal energy of the system) They slow down and get cooler. Thus the temperature drops.
52
Q

The average KE of a smile is more closely related to

A

The heat content of the sample

53
Q

What are the metric units for work?

A

Joules

54
Q

1 J is ___/___

A

N/m

55
Q

Work = formula

A

Force used x Distance moved

56
Q

Work definition

A

Defined as a measurement of force displacing an object.

57
Q

1 N (kg/m^2)

A

kg/ m^2

58
Q

To solve a Work problem with weight in Kg?

A

change to Newton by using w=mg

59
Q

KE =

A

½ mass x velocity ²

60
Q

KE is expressed as J or _____

A

(kg/m²/s²)

61
Q

Therefore, we can calculate

the work done by ________

A

expanding gases.

62
Q

The gas will expand until ______ _____

A

the pressures are equalized.

63
Q

1J for gas and pressure

A

Pa x m^3

64
Q

1 C = ______kilocalories ____calories

A

1 ; 1000

65
Q

When doing a problem, if there is expansion, the system _______. The sign for work of the system should be ______

A

is doing work and losing energy ; negative

W

66
Q

When the problem stated that “x joules was absorbed, what should be inferred? It is ____ and should be _____

A

Heat flowed into the system (endothermic)

Q; positive

67
Q

Remember for gas expansion or volume and pressure problems always convert L to

A

m^3

68
Q

Under which of the following conditions is a gas least likely to be ideal?

A

High Pressure, Low temperature

69
Q

Which of the following processes must always result in a net increase in internal energy of the system?

A

A system gains energy as heat and has work done on it by the surroundings.

SRNAChem&Physics (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions