Science year 2.2: energy effects

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

This lesson contains 25 slides, with interactive quizzes and text slides.

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2.2 Energy Effects
Learning goals

Slide 1 - Slide

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 - Slide

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 - Quiz

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 - Quiz

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

Slide 5 - Quiz

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

Slide 6 - Drag question

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

Slide 7 - Slide

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 - Slide

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

Slide 9 - Slide

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 - Slide

Radiation
moves in all directions

does not need medium


Slide 11 - Slide

Radiation
Heat transfer in all directions through electromagnetic waves

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

Radiation can move through space 

Slide 12 - Slide

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

Slide 13 - Slide

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

Slide 14 - Slide

exotherm
endotherm

Slide 15 - Drag question

Chemical Energy

Slide 16 - Slide

Slide 17 - Slide

Slide 18 - Slide

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 19 - Slide

Slide 20 - Slide

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

Slide 21 - Quiz

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

Slide 22 - Quiz

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

Slide 23 - Quiz

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 - Quiz

homework
Make: 12 until 21
Pages 18 until 22

Slide 25 - Slide