The document describes several chemistry experiments involving chemical and physical changes. Examples of chemical changes included reactions between magnesium and oxygen, magnesium and hydrochloric acid, electricity and hydrochloric acid, cobalt chloride and calcium hydroxide, potassium permanganate and sodium sulphite. Examples of physical changes involved processes like a collapsing can, dissolved tea powder, a vacuum pump and marshmallow, wax changing state from solid to liquid, and ice cubes melting.

1. Chemistry
Stations
Chemical or Physical Change?

2. Magnesium
and Heat
Chemical Change
Mg0
2Mg + O2 → 2MgO
Magnesium + Oxygen gas → Magnesium oxide

3. Magnesium and
Hydrochloric acid
(Mg +HCl)
Chemical Change
MgCl2 + H2

4. Collapsing Can
Physical Change
The can filled with steam - cooled - steam condensed
Pressure on the outside was greater
than that on the inside - collapsed

5. Electricity and
Hydrochloric
Acid
Chemical Change
H + Cl

6. Cobalt Chloride and
Calcium Hydroxide
CoCl2+Ca(OH)2
Chemical Change
Ca(OH)2 + CoCl2 -------> Co(OH)2 + CaCl2

7. Potassium
Permanganate and
Sodium Sulphite
(KmnO4 + Na2SO3)
Chemical Change

8. Milk
Kaleidoscope
Physical Change
Breaking the surface tension

9. Powder and
Water
Physical Change
Dissolved Tea

10. Vacuum Pump
and
Marshmallow
Physical Change
Air pressure

11. Wax and Heat
Physical Change
Solid + Heat = Liquid
Liquid – Heat + Solid
Change of State

12. Ice Cubes and
Heat
Physical Change
Change of State

13. Canister
Explosion
Na HCO3 + CH3COOH
Chemical Change

14. Saturated Salt
Solution
NaCl + H2O + Heat
Physical Change
Water evaporated and left the Salt.

15. Bromothymol
Blue and CO2
Chemical Change
When CO2 mixed with water it became
carbonic acid, which changed the color of the ‘indicator’.
You will learn more about that later!

16. Bonus Stations

17. Sodium
Polyacrylate
and Water
Physical Change!

18. Goldenrod
paper and
liqud
Chemical Change