Y2_T4_LSN_4.4

• Science
• Middelbare school
• havo, vwo
• Leerjaar 2

Get ready

• Your Macbook (join the LessonUp)
• Your notebook.
• Your textbook.
• Pen & highlighter

Topic 4

Moving in the world

Plan for today

• Explanation T4.4 Temperature and heat
  
• Make homework
  

4.4 Temperature and heat

Learning goals

I can....

• describe the concept of temperature, the different scales it can be measured on and the units that belong to those.
• convert temperatures between the Celsius and Kelvin scale.
• describe the concept of heat and the units it can be measured in.
• distinguish between the concepts of temperature and heat
• describe the concept of heat of combustion and use it to calculate the amount of energy released during combustion.

Key words

• Heat
• Temperature
• Celsius
• Kelvin
• Heat of combustion

Heat

Total amount of energy of the molecules that are present in a piece of matter

Unit of heat = Joules (J)

The bigger the energy, the bigger the heat

Temperature

Indication of average amount of kinetic energy (movement) per molecule

Symbol: Temperature ( T )

                                                   

Unit: Degrees Celsius ( °C ) and Kelvin (K)

Heat vs Temperature

Temperature in Celsius

Based on water

0 °C , water going from solid to liquid or back

100 °C, water going from liquid to gas or back

Temperature in Kelvin

Temperature can also be measured in Kelvin (no degrees)

-273 degrees Celsius = 0 Kelvin

0 degrees Celsius = 273 Kelvin

1 degrees up in Celsius=

1 Kelvin up

How many Kelvin is 75 degrees Celsius

1. -198 Kelvin
2. 0,27 Kelvin
3. 3,64 Kelvin
4. 348 Kelvin

Heat of combustion

Combustion reactions:

Burning fuels produces heat that is used 

for many purposes (exothermic)

Different fuels give off different amounts 

of heat, this is known as the heat of combustion.

(MJ = Mega Joules = 1.000.000J)

Gasoline has a heat of combustion of 32 MJ/kg
How much energy wil you get by burning 0,5 kg?

1. 64 MJ
2. 32 MJ
3. 16 MJ
4. 32,5 MJ

Homework

• Study the glossary of 4.4
  
• Complete the exercises of 4.4 (p. 184-187)
• Prepare labjournal