# Heat capacity, specific heat & heat of combustion

Heat capacity, specific heat capacity
& heat of combustion
Textboek
Nova 3 HV TTO 2019-2020
CH 4 paragraph 1
1 / 40
Slide 1: Tekstslide
NatuurkundeMiddelbare schoolhavo, vwoLeerjaar 2,3

In deze les zitten 40 slides, met interactieve quizzen, tekstslides en 9 videos.

Lesduur is: 50 min

## Onderdelen in deze les

Heat capacity, specific heat capacity
& heat of combustion
Textboek
Nova 3 HV TTO 2019-2020
CH 4 paragraph 1

#### Slide 2 -Tekstslide

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

#### Slide 7 -Video

Can you explain why
the first balloon did not pop?

#### Slide 8 -Open vraag

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

#### Slide 10 -Tekstslide

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

#### Slide 13 -Video

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?

#### Slide 14 -Open vraag

Ok, now you.
to this question?

#### Slide 18 -Video

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

#### Slide 22 -Tekstslide

Assignment 1
Q =
m   .
c   .
T
Tstart
Tend
Substance
A
1 g
4,18 J/gºC
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

Calculate A, B

#### Slide 25 -Open vraag

Calculate C, D and E

#### Slide 26 -Open vraag

Calculate F, G and H

#### Slide 27 -Open vraag

Calculate I, J and K

#### Slide 28 -Open vraag

Calculate L, M and N

#### Slide 29 -Open vraag

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.

#### Slide 30 -Open vraag

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.

#### Slide 31 -Open vraag

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.
A
3,9105J
B
3,9104J
C
3,9103J
D
3,9102J

#### Slide 35 -Tekstslide

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