Brainscape's Knowledge GenomeTM

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


See full index

Chemistry > p1.2.2 energy and temperature > Flashcards

p1.2.2 energy and temperature Flashcards

energy and temperature

1
Q

what is temperature?

A

is a measure of the average kinetic energy of a substance particles, measured in degrees Celsius or kelvin

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

what is energy?

A

is the measure of the total thermal energy stored in an object measured in joules

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

what physical changes happen when a solid is heated?

A

particles gain more energy and they move more and their temperature increases

particles undergo a change of state e.g. melting or boiling

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

what chemical change happens when a solid is heated?

A

a reaction is triggered and different molecules are formed

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

what’s a physical change?

A

the change is reversible like changes of state e.g. filtering sand from water

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

what’s a chemical change?

A

the reaction is irreversible and a new substance is formed e.g. forming new salts

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

why is baking a cake a chemical reaction?

A

because you cannot change it to the way it was and the cake is now a new substance that has been foermed

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

why is melting chocolate a physical reaction?

A

because it can be returned to its former state by freezing and the particles undergoes a change of state e.g. melting

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

during a state change, what happens to the temperature of a substance?

A

it remains constant

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

why is energy being used in a state of change?

A

it is used to break (heating) or make (cooling) intermolecular bonds

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

cooling curve of steric acid

A

liquid

              physical change
                                              

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

what are factors that will affect the amount of heat required?

A

the type of material
the mass of material
the temperature

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

what is specific heat capacity?

A

the specific heat capacity of a material is the amount of heat required to raise the temperature of 1kg of a material by 1’c

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

what is the equation for change in thermal energy?

A

mass x specific heat capacity x temperature change

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

what is the equation for mass?

A

change in thermal energy / specific heat capacity x temperature change

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

what is the equation for temperature change?

A

thermal energy / specific heat capacity x mass

17
Q

what is the equation for specific heat capacity?

A

change in energy / mass x temperature change

18
Q

what is the unit for thermal energy?

A

j- joules

19
Q

what is the unit for mass?

A

kg- kilograms

20
Q

what is the unit for specific heat capacity?

A

j, ‘c, KJ-kilojoules

21
Q

what is the unit for temperature change?

A

‘c

22
Q

exam question-
water has a specific heat capacity of 4200 j/kg/’c 2kg of water is to be heated by 20’c calculate the energy required

A

16800j

23
Q

what happens when a hot object and a cold object are left in a room?

A

hot objects get colder and cold objects get warmer until they reach thermal equilibrium- same temperature

24
Q

what is specific latent heat?

A

the amount of energy required to change the state of 1 kg of material without a change in the temperature

25
Q

what is the equation for thermal energy for a change of state?

A

mass x specific latent heat

26
Q

what is the equation for mass?

A

energy / specific latent heat

27
Q

what is the equation for specific latent heat?

A

energy/ mass

28
Q

what is thermal energy for a change of state used for?

A

to break intermolecular forces between the atoms

29
Q

what’s the difference between specific heat of melting and specific latent heat of boiling?

A

specific latent heat of melting applies to the energy required to melt 1kg of a material and of boiling applies to energy required to boil 1kg of a material

30
Q

explain why the pressure of a balloon increases when more particles are blown into

A

gas pressure is caused when a gas particle collides with a surface and exerts a force onto it increasing the number of collisions on the balloons surface which increases the pressure and makes the balloon expands

31
Q

what type of energy do gas particles get more of when heated?

A

thermal and kinetic

32
Q

what is pressure?

A

pressure is the force per unit area it is measured in pascals

33
Q

what would happen if pressure was reduced to zero?

A

the temperature reaches a minimum

34
Q

what is the coldest possible temperature?

A

absolute zero

35
Q

what happens when the temperature is absolute zero?

A

the particles have no internal energy and do not move

Chemistry (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions