Thermal Properties

Question 1

What is the attraction force between particles of matter called

Answer 1

Cohesion

Question 2

Define Heat

Answer 2

It is the energy in transit from an object of higher temperature to an object of lower temperature

Question 3

Describe the properties of a thermometer

Answer 3

Stem.
Is made from thick glass insulating
Has a thin, uniform bore extending up through stem

Thin walled glass bulb
Filled with mercury or coloured alcohol

Vacuum above column of mercury or coloured alcohol

Question 4

Describe how you will calibrate a thermometer

Answer 4

Hahaheee

Question 5

Def range of a thermometer

Answer 5

It is the range in temps (from the lowest to the highest )

that the thermometer is able to measure accurately and

without being damaged

Question 6

Def linearity

Answer 6

It is the property of a thermometer

which produces a change in thermometric property,

such as expansion of mercury,

which is directly proportional to the change in temperature

Question 7

Def Sensitivity

Answer 7

It is the property of a thermometer

which results in a small change in temperature causing a large change in the thermometric property

and a quick response to heat

Question 8

How can you increase the sensitivity of a thermometer

Answer 8

1. Reduce the diameter of the bore
2. Increase the size of the bulb
3. Use a thin walled glass bulb

Question 9

Def heat

Answer 9

Heat is energy in transit from an object having a high temperature to an object having a lower temperature

Question 10

Def Specific heat Capacity

Answer 10

It is the quantity of heat transferred when

The temp of 1 kg of substance

Changes by 1 C. Or 1 K

Unit is J kg-1 C-1. Or J kg-1 K-1

Question 11

What is the formula used in heat loss heat gained reactions

Answer 11

Q = m@c
Q in J. joules
m in kg
c in J.kg-1.C-1

NB. Also remember
W = Pt. (work is pt)

W in Joules.
P = kW
t = s
An electric heater rated 100 kW heats water in certain time

Question 12

Def heat capacity

Answer 12

The heat capacity of a Given mass of a substance is the amount of heat that must be transferred

In order to change its temp by 1 oC

Symbol = C
Unit. J.C-1

Question 13

What is the formula to show the link between heat capacity and specific heat capacity

Answer 13

C =cm

Question 14

Define internal energy

Answer 14

It is equal to the sum of the potential and kinetic energies of the particles of a body

Question 15

Def latent heat

Answer 15

It is the heat required

to change the phase of a substance

at constant temperature

Question 16

Def specific latent heat

Answer 16

Is the amount of heat required to

change the phase of

one kilogram of the substance

at constant pressure

Question 17

Def. Specific latent heat of fusion

Answer 17

Is the quantity of heat required

to melt 1kg of solid into liquid at

constant temperature

Question 18

Def. specific latent heat of vaporisation

Answer 18

Is the quantity of heat required to vaporise 1kg of liquid into vapour at constant temperature