2 YR2_T2_LSN3 2.2

Topic 2.2
Energy effects 
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Slide 1: Slide
ScienceMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 33 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 45 min

Items in this lesson

Topic 2.2
Energy effects 

Slide 1 - Slide

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Topic 2.1
Week
Planning
47
Topic 2.1 + Bean Pr
48
Topic 2.2 + Bean Pr
49
Topic 2.3 + Bean Pr
50
Topic 2.4 + Bean Pr
51
Submission Bean Pr
52-1
Christmas Break
Week
Planning
2
Topic 2.5 
3
Graded lab lesson
4
Test Topic 2
5
6
7

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2.1 Key words
  • Energy
  • Law of conservation of energy
  • Renewable 
  • Non-renewable
  • Sustainable 
  • Non-sustainable

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Energy
Most common forms of energy:

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Energy sources

Slide 5 - Slide

Renewable = renews itself
non-renewable =  runs out, wont be able to use it forever
Practice quiz on Kwizl
  • 8 min max practice quiz.
  • 5 min max write a reflection in your notebook:
  • What mistakes did I make?
  • Why were they mistakes?
  • What can I do better next time?
timer
20:00

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2.2  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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2.2  Key Words
  • Conduction
  • Conductors
  • Insulators
  • Convection
  • Radiation
  • Exothermic
  • Endothermic
  • Activation energy
  • Catalyst
  • Enzymes

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2.2  Heat transfer

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

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2.2  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

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2.2  Convection
  • Convection = 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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2.2  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 

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2.2  Radiation

  • moves in all directions
  • does not need medium


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

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

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Which type of heat transfer occurs due to the movement of fluids?
A
Conduction
B
Radiation
C
Condensation
D
Convection

Slide 19 - Quiz

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The sun heats the earth.
This is an example of....
A
Radiation
B
Convection
C
Conduction

Slide 20 - Quiz

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In a frying pan the heat goes from outsite to the insite.
A
Radiation
B
Convection
C
Conduction

Slide 21 - Quiz

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Heat is transported from the central heating boiler to the radiators.
A
Radiation
B
Convection
C
Conduction

Slide 22 - Quiz

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Which phase best enables thermal convection to take place?
A
solid
B
liquid
C
gas

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

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A thermos blocks
which type(s)
of heat transport?
A
Convection & radiation
B
Convection
C
Radiation
D
Conduction, convection & radiation

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In which phase is conduction the only means of heat transfer, as convection cannot take place?
A
solid
B
liquid
C
gas

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Which of the following statements is true about exothermic reactions?
A
They release heat energy to the surroundings
B
They require a catalyst to occur
C
They have a decrease in temperature
D
They absorb heat energy from the surroundings

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Which of the following is not an example of an exothermic reaction?
A
Photosynthesis
B
Respiration
C
Burning of wood
D
Neutralization of an acid and a base

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BEAN PROJECT
Growing beans in a glass jar (with kitchen paper, cotton wool and some water!)

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BEAN PROJECT
  • 1 - 14 days: measuring the length of the bean plant
  • Use a ruler or geo triangle and add results to Google spreadsheet

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My research question is:

Slide 31 - Open question

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My hypothesis is:

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Homework 
Wednesday:

  • Read the Bean project manual page 7-10 (Scientific drawing)
  • Make exercises 12-18 of topic 2.2 in your workbook  

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