YR2_T2_LSN2

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ScienceMiddelbare schoolhavo, vwoLeerjaar 2

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Slide 1 - Diapositive

YR2_T2_LSN3
Topic 2.2 Energy effects

Slide 2 - Diapositive

Plan for today:
  • Explanation T2.2 Energy effects
  • Make homework 

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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.

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

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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:

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

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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

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

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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

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Radiation
Radiation is heat transfer without molecules
It travels in waves

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

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

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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

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

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