Observing change. Chemical reactions

Сентябрь 8, 2022

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Observing change. Chemical reactions

Содержание

2. Physical change These are physical changes where there is no change in particles, just their arrangement
3. Chemical change These are examples of chemical changes where a chemical reaction takes place and a
4. Chemical reactions During chemical reactions the atoms (particles) rearrange to form a new substance. The signs
5. Activity 2.1: What changes are taking place in chemical reactions? Results are on the next slide.
6. Activity 2.1 Results: Test tube A and B = Chemical Change (change in temperature and bubbles)
7. Activity 2.2: Conservation of Mass Results: There is no change in mass in Solution A or
8. Law of Conservation of Mass Antoine Lavoisier discovered that the mass of a substance cannot be
9. Particle Model Diagrams These diagrams show how particles (atoms) rearrange to form a new substance.
10. Particle Model Diagrams Draw a particle model diagram for below: Copper + Oxygen → Copper oxide
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Слайд 2

Physical change
These are physical changes where there is no change in

particles, just their arrangement and their energy.

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Chemical change
These are examples of chemical changes where a chemical reaction

takes place and a new substance is formed. During a chemical change energy may be released or absorbed.

Слайд 4

Chemical reactions
During chemical reactions the atoms (particles) rearrange to form a

new substance.
The signs that indicate that this has occurred are:
colour change
light is emitted
change in temperature
bubbles of gas are produced.

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Activity 2.1: What changes are taking place in chemical reactions?
Results are

on the next slide.

Слайд 6

Activity 2.1
Results:
Test tube A and B = Chemical Change (change

in temperature and bubbles)
Test tube C and D = Physical Change

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Activity 2.2: Conservation of Mass
Results:
There is no change in

mass in Solution A or Solution B.
Conclusion:
There is no change in Mass during a Physical or Chemical Change.

Слайд 8

Law of Conservation of Mass
Antoine Lavoisier discovered that the mass

of a substance cannot be created or destroyed, so during a physical and chemical change there is no change in the overall mass.

Слайд 9

Particle Model Diagrams
These diagrams show how particles (atoms) rearrange to form

a new substance.

Слайд 10

Particle Model Diagrams
Draw a particle model diagram for below:
Copper + Oxygen → Copper oxide