Download presentation
Presentation is loading. Please wait.
Published byBrittany Miles Modified over 9 years ago
1
Chemical Reaction Lab
2
Chemoluminescent Demo At the start: Luminol solution: clear 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
3
Burn, Baby Burn Signs we see: Color change-wood went from beige to black Odor change- smell the burning wood Gas formation (CO 2, CO, etc…) Energy exchange-light, heat Mass 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
4
Curses Foiled Again At the start Solution 1 was a blue liquid (Copper chloride CuCl 2 ) Aluminum foil was a silver solid (Al) At the end The solution was now clear (Aluminum Chloride AlCl 3 ) There was a red/brown solid precipitate (copper Cu ) What happened: 2Al + 3CuCl 2 2AlCl 3 + 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
5
Pittsburgh Sheep At the beginning Solution 2 was clear (Vinegar) Steel wool was grayish/blackish/silver (has iron in it) At the end Solution 2 was clear Steel wool has brownish/reddish spots on it- THIS IS RUST, NOT A PRECIPITATE!! What happened: 3Fe + O 2 -> Fe 2 O 3 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?
6
The Gas We Pass At the beginning: Powder 1- Sodium Bicarbonate (NaHCO 3 ) Solution 2- Vinegar (with acetic acid)(CH 3 COOH) At the end: Carbon dioxide (CO 2 ) Water (H 2 O) Sodium Acetate(NaCH 3 COO) What happened: NaHCO 3 + CH 3 COOH CO 2 + H 2 O + NaCH 3 COO Signs we saw to indicate a chemical reaction: precipitate formation, gas formation, color change (slight), energy change
7
Cabbage Water At the beginning: Solution 2- Vinegar (with acetic acid)(CH 3 COOH) was clear Solution 3- Laundry Detergent was blue Solution 4-Cabbage water (pH indicator) was purple At the end: 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 Laundry detergent is more basic (has less H+ ions) and therefore turns green Signs we saw to indicate a chemical reaction: color change, energy change
8
Elephant Toothpaste Before: Hydrogen Peroxide – Clear liquid Potassium iodine solution – cold, cloudy, yellowish liquid What happened: Created potassium and iodide ions in water and oxygen gas KI + 2 H 2 O 2 2H 2 0 + O 2 +K + I Signs of a Chemical Reaction Gas formation, Energy change, Odor change, Color change
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.