2 YR2_T2_LSN3 2.2

• Science
• Middelbare school
• havo, vwo
• Leerjaar 2

Topic 2.2

Energy effects 

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

2.1 Key words

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

Energy

Most common forms of energy:

Energy sources

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?

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.

2.2  Key Words

• Conduction
• Conductors
• Insulators
• Convection
• Radiation

• Exothermic
• Endothermic
• Activation energy
• Catalyst
• Enzymes

2.2  Heat transfer

2.2  Conduction

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

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

2.2  Convection

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

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

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 

2.2  Radiation

• moves in all directions
• does not need medium

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

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

Which type of heat transfer occurs due to the movement of fluids?

1. Conduction
2. Radiation
3. Condensation
4. Convection

The sun heats the earth.
This is an example of....

1. Radiation
2. Convection
3. Conduction

In a frying pan the heat goes from outsite to the insite.

1. Radiation
2. Convection
3. Conduction

Heat is transported from the central heating boiler to the radiators.

1. Radiation
2. Convection
3. Conduction

Which phase best enables thermal convection to take place?

1. solid
2. liquid
3. gas

Convection is heat transfer through...

1. solid materials
2. fluids and gasses
3. nothing
4. glass

A thermos blocks
which type(s)
of heat transport?

1. Convection & radiation
2. Convection
3. Radiation
4. Conduction, convection & radiation

In which phase is conduction the only means of heat transfer, as convection cannot take place?

1. solid
2. liquid
3. gas

Which of the following statements is true about exothermic reactions?

1. They release heat energy to the surroundings
2. They require a catalyst to occur
3. They have a decrease in temperature
4. They absorb heat energy from the surroundings

Which of the following is not an example of an exothermic reaction?

1. Photosynthesis
2. Respiration
3. Burning of wood
4. Neutralization of an acid and a base

BEAN PROJECT

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

BEAN PROJECT

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

My research question is:

My hypothesis is:

Homework 

Wednesday:

• Read the Bean project manual page 7-10 (Scientific drawing)

• Make exercises 12-18 of topic 2.2 in your workbook