Lesson 7

• Physics
• Middelbare school
• vwo
• Leerjaar 3

Chapter 3 — Energy

This lesson

•  Understanding Heat
• Specific heat capacity
• Worksheet
• Understanding isolation

Learning goals

By the end of this lesson you will be able to:

• Explain what heat is at a molecular level.
• Name the unit of heat.
• Explain what specific heat capacity is.
• Calculate specific heat capacity.
• Explain what isolation is in your own words.

Understanding heat

What is heat?

What is heat?

What is heat?

•  Heat is thermal energy.
• Heat is the internal movement of a substance at a molecular level.
• Since heat is a form of energy the unit of heat is Joule (J).

Note: In all physical processes some amount of energy is lost in the form of heat

Phet

Have a look at chapter 3, section 2 in the digital version of the book. Go over the part 'Experiment with a calorimeter

Specific heat Capacity

Specific heat capacity

The amount of energy required to heat up a certain amount of a substance a certain amount of temperature

Specific heat capacity

The amount of energy required to heat up a certain amount of a substance a certain amount of temperature

Examples:

• You need 4,2 Joule to heat up 1 gram of water 1 ºC
  
• You need 0,129 Joule to heat up 1 gram of gold 1º C

Specific heat capacity

Q: Heat in joules (J)

c: The specific heat capacity of a s substance (J/(g•ºC)

m: The mass of a substance in grams (g)

ΔT = T end  - T start : The temperature difference (ºC)

Q=c⋅m⋅ΔT

Worksheet specific heat capacity

Isolation