Heat capacity, specific heat & heat of combustion

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 2,3

Heat capacity, specific heat capacity

& heat of combustion

Textboek

Nova 3 HV TTO 2019-2020

CH 4 paragraph 1

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You can explain the difference between the definitions of heat capacity, specific heat and 

heat of combustion

You are able to make calculations using the formulas for these definitions

Can you explain why
the first balloon did not pop?

Heat capacity

The heat capacity of an object, is the amount of heat (J) which need to be supplied to the object to increase its temperature by one degree Celcius.

The symbol for specific heat capacity is: C

The unit: J/°C

Specific heat capacity

Every substance has certain properties which can be used to recognize that material. Specific heat capacity is one of these properties. 

The symbol for specific heat capacity is: c

The unit: J/g°C

What does it tell you?

It tells you about the amount of heat (J) needed to heat up 1 gram by 1 degree Celcius. Water needs 4,18 J/g°C while Iron only needs 0,46 J/g°C.

Textboek

zie page 139 & 140

A coffee cup has a heat capacity
of 62.6 J/°C. The coffee cup's
temperature is increased by 1.2 °C.
How much heat has it absorbed?

Upload a photo of your calculation

Ok, now you.
What will be the answer
to this question?

Upload a photo of your calculation

Heat of combustion

When you burn a material, heat will be released.

The amount of heat (J) released is always the same per unit mass.

The symbol for heat of combustion is:  ΔH∘c

The unit: MJ/m3 (gas), MJ/L (liquid), MJ/kg (solid)

Setup

Calculation

Assignment 1

Q =	m .	c .	T	Tstart	Tend	Substance
A	1 g	4,18 J/g º C	1 ºC	B	21 ºC	water
C	75 g	D	E	20 ºC	35 ºC	Iron
F	0,11 kg	G	50 ºC	-20 ºC	H	tin
672 J	I	J	35 ºC	K	20 ºC	zilver
3166 J	0,062 kg	L	111 ºC	M	25 ºC	N

OPEN TABLE

CLOSE 

TABLE

Some practice with specific heat, 

calculate the missing values

Question

Answers

Calculate A, B

Calculate C, D and E

Calculate F, G and H

Calculate I, J and K

Calculate L, M and N

Heat 25 g of olive oil from 30 °C to 64 °C.
The specific heat of olive oil is 1.7 J/g∙°C.

Calculate the heat supplied.

Heat 53 g of turpentine from 1 °C to 34 °C.
The specific heat of turpentine is 1.8 J/g∙°C.

Calculate the heat supplied.

Heat 1,25∙10^3 g of water until the temperature has increased by 75 °C. The specific heat of water is 4.2 J/g∙°C.

Select the correct heat supplied.

1. 3,9⋅10​5​​J
2. 3,9⋅10​4​​J
3. 3,9⋅10​3​​J
4. 3,9⋅10​2​​J

Use the following You Tube videos for in depth studying or to better understand the subject at hand.