Y2_T2_LSN2.2

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

HAVE READY:

Textbook & notebook closed

Macbook on KWIZL

Practice quiz on Kwizl:

• 7 min max practice quiz.
• 5 min max peer review and feedback.
• 3 min max write a reflection in your notebook:
• What mistakes did I make?
• Why were they mistakes?
• What can I do better next time?

HW for today:

• Check your hw exercises.
• Use a different colour.
• Show your work to get a sticker.

Kinetic energy

Thermal energy

Chemical energy

Electric energy

Nuclear energy

Sonic energy

Electro magnetic energy

Energy that results from movement of an object

Energy resulting from a temperature difference between two systems

Energy resulting from reactions between atoms and / or molecules

Energy resulting from the flow of electrons

Energy resulting from changes in the atomic nuclei or from nuclear reactions

Energy in the form of sound waves

Energy that travels in waves at the speed of light

Chemical energy

Electrical energy

Kinetic Energy

Thermal Energy

Renewable

Non-Renewable

Solar energy

Natural Gas

Nuclear energy

Coal

oil

Wind

Geothermal

Biomass

TOPIC 2.2

ENERGY EFFECTS

P. 60-69

§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 - 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.

Exothermic vs Endothermic:

GET READY:

• your lab partner
• pen/pencil
• your labjournal