Chemical
Reaction Lab
Chemoluminescent Demo
 At


the start:
Luminol solution: blue liquid
Hydrogen peroxide: clear liquid
 What



we saw:
Glowing blue color and then an ugly brown color
Bubbles
Temperature rose about 7-8 ºC
 Signs
of a chemical reaction: Energy change
(light, heat), gas formation, color change
Burn, Baby Burn
 Signs




Color change-wood went from beige to black
Odor change- smell the burning wood
Gas formation (CO2, CO, etc…)
Energy exchange-light, heat
 Mass

we see:
went from ~1 gram to ~0 grams
How can this be? Did we lose mass?
 No,
it escaped as gas
 If we captured the gas the mass would be the same
Curses Foiled Again
 At


Solution 1 was a blue liquid (Copper chloride CuCl2)
Aluminum foil was a silver solid (Al)
 At


the start
the end
The solution was now clear (Aluminum Chloride AlCl3)
There was a red/brown solid precipitate (copper Cu)
 What




happened:
2Al + 3CuCl2  2AlCl3 + 3Cu
Copper and chlorines bond breaks
Aluminum and chlorine bond
Copper falls out of solution (precipitate)
 Signs
we saw to indicate a chemical reaction: color
change, precipitate formation
Pittsburgh Sheep
 At


Solution 2 was clear (Vinegar)
Steel wool was grayish/blackish/silver (has iron in it)
 At


the beginning
the end
Solution 2 was clear
Steel wool has brownish/reddish spots on it- THIS IS RUST,
NOT A PRECIPITATE!!
 What


happened:
4Fe + 3O2 -> 2Fe2O3
When iron from the steel and oxygen from the vinegar
meet they bond together to give you rust
 Signs
we saw to indicate a chemical reaction: heat
exchange, color change, maybe odor change?
The Gas We Pass
 At


Powder 1- Sodium Bicarbonate (NaHCO3)
Solution 2- Vinegar (with acetic acid)(CH3COOH)
 At



the beginning:
the end:
Carbon dioxide (CO2)
Water (H2O)
Sodium Acetate(NaCH3COO)
 What


happened:
NaHCO3 + CH3COOH  CO2 + H2O + NaCH3COO
Signs we saw to indicate a chemical reaction: precipitate
formation, gas formation, color change (slight), energy
change
Cabbage Water

At the beginning:




At the end:



Solution 2- Vinegar (with acetic acid)(CH3COOH) was clear
Solution 3- Ammonia was clear
Solution 4-Cabbage water (pH indicator) was purple
Test Tube A: Solution 2 + Solution 4= a pink colored liquid
Test Tube B: Solution 3 + Solution 4= a greenish blue colored liquid
What happened:



Vinegar w/acetic acid is more acidic (has more H+ ions) and
therefore turns pink
Ammonia is more basic (has less H+ ions) and therefore turns
green
Signs we saw to indicate a chemical reaction: color change,
energy change, odor change
Elephant Toothpaste
 Before:


Hydrogen Peroxide – Clear liquid
Potassium iodine solution – cold, cloudy, yellowish
liquid
 What


Created potassium and iodide ions in water and
oxygen gas
KI + 2 H2O2  2H20 + O2 +K + I
 Signs

happened:
of a Chemical Reaction
Gas formation, Energy change, Odor change, Color
change