matter - 9hs
DESCRIPTION
Matter - Chemistry powerpoint for grade 9TRANSCRIPT
Settler Activity
Learning Objective :
Explain how physical and chemical changes involve transfers of energy.
Matter & Energy
DATE
September 30, 2014
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
1
How are these images related?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Why is energy important?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Energy
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical or Chemical?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical or Chemical?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical or Chemical?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical or Chemical?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical or Chemical?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical or Chemical?
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Physical Changes
Energy is involved in physical changes
In state changes we see a change in kinetic energy
In pairs, discuss how the kinetic energy changes as states change
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Chemical Changes
Energy is involved in chemical changes
Whenever a chemical reaction occurs energy is usually transferred to or from the surroundings.
For example, when fireworks burn they give out energy in the form of light, heat and sound
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Clip: http://www.youtube.com/watch?v=yvyHVA1Ww_M
Complete the sentence:
Exothermic is when energy is ________, endothermic is when energy is ___________.
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Exothermic Reactions
In an exothermic reaction energy is given out, usually in the form of heat.
This can often be detected by a rise in temperature.
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Exothermic reactions are very common. For example:
Burning fuels
Cellular Respiration
14
Endothermic Reactions
In an endothermic reaction energy is taken in, often as heat, from the surroundings.
This can often be detected by a fall in temperature.
Endothermic reactions are not very common.
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Some examples are:
Barium hydroxide + ammonium nitrate
photosynthesis takes in light energy
Cooking an egg
Evaporating water
Melting ice cubes
15
Real Life Example Glow Sticks
EXOTHERMIC - The chemical reaction in a light stick releases energy in the form of light
There are three components of a light stick.
There need to be two chemicals that interact to release energy and also a fluorescent dye to accept this energy and convert it into light.
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Plenary
Two Stars and a wish
Write down two things you have learned and one thing you would like to know more about.
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.
Homework
Research the term calorimeter and write a definition in your book.
Answer the following two questions: 1) What do scientists use calorimeters for?
2) Explain in a few short sentences how a bomb calorimeter works.
LO:Explain how physical and chemical changes involve transfers of energy
Keywords: Energy, matter, physical, chemical.