YR2_T2_LSN2

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Slide 1: Slide

ScienceMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 15 slides, with text slides.

Lesson duration is: 45 min

Items in this lesson

Get ready:

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

Slide 1 - Slide

YR2_T2_LSN3

Topic 2.2 Energy effects

Slide 2 - Slide

Plan for today:

Explanation T2.2 Energy effects
Make homework

Slide 3 - Slide

Learning goals

I can…

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

Slide 4 - Slide

Key words

Conduction
Conductors
Insulators
Convection
Radiation
Exothermic
Endothermic
Activation energy
Catalyst

Enzymes

Slide 5 - Slide

Heat transfer

Heat can easily be transferred from one place to another.

Heat always moves from warmer to cooler places.

Heat transfer happens in 3 ways:

Slide 6 - Slide

Conduction

Conduction is 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

Conductors: good at conducting heat - metals; copper, silver
Insulators: not good at conducting heat - plastic, cork, air, wood

Slide 8 - Slide

Convection

Convection is 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

Radiation is heat transfer without molecules

It travels in waves

Slide 11 - Slide

Endothermic

When a chemical reaction needs heat, it's called endothermic.

Slide 12 - Slide

Exothermic

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

Slide 13 - Slide

Catalysis

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 14 - Slide

Homework

Make exercises 12-21 of topic 2.2 in your workbook
Prepare labjournal for skills 6 ''Exothermic vs endothermic''

Slide 15 - Slide