Y2_T2_LSN2.2

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

TOPIC 2.2

ENERGY EFFECTS

P. 58-67

§2.2 - Learning Goals:

P. 60-69

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:

P. 60-69

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

§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

Radiation

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

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

Homework for next time:

Lablesson:

• Study the parts of the bean.
• LABJOURNAL - prepare for the experiment “Drawing a bean” from Growing bean project - HAVO / Growing bean project - VWO

Theory lesson:

• Complete the exercise of Topic 2.1 (p.54-59)
• Read Topic 2.2 (p. 60-63)
• Study the glossary of Topic 2.2 on Studygo.
• LABJOURNAL: prepare for the experiment: Exothermic vs endothermic reaction

Exothermic vs Endothermic:

GET READY:

• your lab partner
• pen/pencil
• your labjournal