2 YR2_T2_LSN4 2.2

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YR2_T2_LSN4
Topic 2.2

Slide 1 - Diapositive

Planning for today
  • Homework check
  • Correct homework
  • Lab: Exothermic vs endothermic reaction

Slide 2 - Diapositive

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

Slide 3 - Diapositive

2.2  Heat transfer

Slide 4 - Diapositive

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

Slide 5 - Quiz

In a frying pan the heat goes from outsite to the insite. This is an example of...
A
Radiation
B
Convection
C
Conduction

Slide 6 - Quiz

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

Slide 7 - Quiz

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

Slide 8 - Quiz

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

Slide 9 - Quiz


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

Slide 10 - Quiz

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

Slide 11 - Quiz

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

Slide 12 - Quiz

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

Slide 13 - Quiz

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

Slide 14 - Diapositive

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

Slide 15 - Diapositive

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 

Slide 16 - Diapositive

Slide 17 - Diapositive

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

Slide 18 - Diapositive

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

Slide 19 - Diapositive

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)
timer
10:00

Slide 20 - Diapositive

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

Slide 21 - Diapositive

Lab Lesson
  • Read "Exothermic vs endothermic reactions"

Slide 22 - Diapositive