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Published byDella Stokes Modified over 9 years ago
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Chemical Reaction Lab
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Bioluminescent 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), temperature change, gas formation, color change
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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…) Heat exchange-light, heat Mass went from ~1 gram to ~0 grams How can this be? Did we lose mass?
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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, gas formation, temperature
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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: color change, maybe temperature
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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: Gas formation, energy change
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Cabbage Water At the beginning: Solution 2- Vinegar (with acetic acid)(CH 3 COOH) was clear Solution 3- Ammonia was clear 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 green 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
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Elephant Toothpaste Before: Hydrogen Peroxide – Clear liquid Potassium iodide solution – cold, cloudy 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 Temperature change Odor change Color change
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