YR2_T2_LSN3

Get ready:
  • Your Macbook (join the lessonup)
  • Your notebook.
  • Your textbook.
  • Pen & highlighter
1 / 16
next
Slide 1: Slide
ScienceMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 16 slides, with text slides.

time-iconLesson 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:
  • Homework check
  • Explanation T2.2 Energy effects
  • Make homework 

Slide 3 - Slide

Homework check
  • Answers for topic 2.1 are in the classroom
  • Correct your answers in a different color (Answer wrong? write down the correct answer in the different color)

Slide 4 - 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 5 - Slide

Key words
  • Conduction
  • Conductors
  • Insulators
  • Convection
  • Radiation
  • Exothermic
  • Endothermic
  • Activation energy
  • Catalyst
Enzymes

Slide 6 - 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 7 - Slide

Conduction
Conduction is heat transfer via direct contact.
  • Example:  a pan transfers heat to food.

Slide 8 - 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 9 - Slide

Convection
Convection is heat transfer via air or water. 
  • Example:  radiator warms the air in a room

Slide 10 - 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 11 - Slide

Radiation
Radiation is heat transfer without molecules
It travels in waves

Slide 12 - Slide

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

Slide 13 - Slide

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

Slide 14 - 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 15 - Slide

Homework
  • Make exercises 12-21 of topic 2.2 in your workbook
  • Read ''brown bean project'' chapter: Making a scientific drawing 

Slide 16 - Slide