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 all the exercises of 4.4 

Finishing your  Lab journal (see hand in date as SO in magister)

(for more help with what you should have in your Lab journal, check the LessonUp lesson about the Lab journal in topic 4)