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Topic 1 Lesson 3
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Transcript
T1L3: Changes in Matter
Warm-up
Warm-Up
Which of these do you think is a chemical change? Write down what you think.
Crushing a can
Burning toast
Blowing a balloon
Physical Changes
- A physical change alters the form or appearance of matter
- It does not make a new substance
- Anything that goes from solid to liquid or gas counts as a physical change
- (For example, water is still water)
Physical Changes
Physical Changes Practice
Discuss with your partners how each of these are physical changes.
Physical Changes Video
Chemical Changes
- A chemical change is a change in which new substances are created
- They do not involve changes from a solid to liquid or gas
- In a chemical change, atoms recombine to make new substances
Chemical Changes
Chemical Changes Practice
Discuss with your partners where you see a chemical change and where is a physical change.
Chemical Changes Video
Conservation of Mass
- the conservation of mass tells us that matter cannot be created or destroyed, only transformed
- you cannot destroy matter
- atoms can be recombined but never completely destroyed
Conservation of Mass
Temperature and Thermal Energy
- Temperature refers to how hot or cold something is
- if the atoms of the object are hot, then its atoms move very fast
- Thermal energy is the total energy of all particles that are moving in something
Conservation of Mass
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