# Science year 2.2: energy effects

2.2 Energy Effects
Learning goals
1 / 25
Slide 1: Tekstslide
ScienceMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 25 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

2.2 Energy Effects
Learning goals

#### Slide 1 -Tekstslide

Learning goals
- Explain the three different types of heat transfer
- Identify which type of transfer is present in a situation
- Explain the difference between conductors and isolators and
describe how they should be used
- Identify if a reaction is endothermic or exothermic
- explain the effect of catalysts on chemical reactions

#### Slide 2 -Tekstslide

What was renewable energy?
A
New types of energy
B
It does not run out, it renews itself
C
energy that consists of waves
D
It runs out, so we won’t be able to use it forever

#### Slide 3 -Quizvraag

What does the 'law of conservation of energy' mean?
A
energy can not convert from one form to another
B
Energy has to uphold the law
C
Energy is never lost
D
Energy is lost when converted

#### Slide 4 -Quizvraag

Nuclear energy is
A
sustainable
B
Renewable
C
sustainable and renewable
D
Not sustainable nor renewable

#### Slide 5 -Quizvraag

heat transfer via direct contact.
heat transfer via air or water.
heat transfer via light/ electromagnetic radiation
convection
conduction

#### Slide 6 -Sleepvraag

Conduction
Conduction = heat transfer via direct contact.
Example = a pan transfers heat to food

#### Slide 7 -Tekstslide

Conduction
Heat transfer through direct contact between the particles in a substance

Insulators: not good at conducting heat
plastic, cork, air, wood

Conductors: good at conducting heat
metals; copper, silver

#### Slide 8 -Tekstslide

Convection
Convection = heat transfer via air or water.
Example = radiator warms the air in a room

#### Slide 9 -Tekstslide

Hot air has a lower density than cold air, therefore it will rise upwards
Cold air has a higher density than hot air, therefore it will sink

#### Slide 10 -Tekstslide

moves in all directions

does not need medium

#### Slide 11 -Tekstslide

Heat transfer in all directions through electromagnetic waves

Radiation does not need a medium to go from one place to another

#### Slide 12 -Tekstslide

when a chemical reaction needs heat, it's called endothermic

#### Slide 13 -Tekstslide

chemical reactions that release thermal energy(heat) to the environment are called exothermic

exotherm
endotherm

Chemical Energy

#### Slide 18 -Tekstslide

Catalysts
Each reaction needs energy to get started → activation energy
Example: Heat is needed to start a fire (ignition temperature)

The activation energy can be lowered by catalysts (certain molecules)

There are also catalysts in your body, they are called enzymes

#### Slide 20 -Tekstslide

convection is heat transfer through...
A
solid materials
B
fluids and gasses
C
nothing
D
glass

#### Slide 21 -Quizvraag

a catalyst makes is harder for a reaction to happen
A
true
B
false

#### Slide 22 -Quizvraag

Burning coal on a barbecue is an exothermic reaction
A
true
B
false

#### Slide 23 -Quizvraag

what is needed for conduction
A
molecules that can move around freely
B
no molecules at all
C
molecules very close to each other
D
al lot of different types of molecules

#### Slide 24 -Quizvraag

homework
Make: 12 until 21
Pages 18 until 22