2 YR2_T2_LSN4 2.2

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

YR2_T2_LSN4

Topic 2.2

Planning for today

• Homework check
• Correct homework
  
• Lab: Exothermic vs endothermic reaction
  

BEAN PROJECT

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

2.2  Heat transfer

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

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

In a frying pan the heat goes from outsite to the insite. This is an example of...

1. Radiation
2. Convection
3. Conduction

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

1. Radiation
2. Convection
3. Conduction

Convection is heat transfer through...

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

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

1. Radiation
2. Convection
3. Conduction

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

2.2  Conduction

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

2.2  Convection

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

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 

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

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

Correct your homework

• Answers for topic 2.1 and 2.2 are in the classroom
• Correct your answers in a different color (Answer wrong? write down the correct answer in the different color)

Homework

• Read and learn Topic 2.1 and 2.2 
• Study the glossary of Topic 2.1 and 2.2 on StudyGo.
  
• Read Topic 2.3

Lab Lesson

• Read "Exothermic vs endothermic reactions"