mp4pd5Group+4


 * Background information **

Water: Used for: drinking, watering food and washing things Is it harmful: No Formula: H2O Properties: The Universal Solvent CaCl2: Used for: salt Is it harmful: Yes, irritant to the skin, eye, and organs Formula: Calcium Chloride Properties: Forms reaction with air Sodium Bicarbonate: Used for: Baking soda Is it harmful: No Formula: NaHCO3 Properties: Solution is from dissolves Bromothymol Blue: Used for: Observing Photosynthetic Is it harmful: Many cause irritation to skin/eyes Formula: C27H27B2O5Na Properties: Solution = Equation = CaCl2 + 2NaHCO3 ---> CaCO3 + 2NaCl + H2O +CO2 CaCO3 = the paripated CO2 = the gas 2NaCl couldn't dissolve in water so formed acid bremothymol blue turns yellow when mixed with acid
 * Summary- **

We started experimenting with chemical reactions. The first one we was the test the combination H20 + NaHCO. The one thing that we needed to do is the preparations. We followed these steps. 1. Measure the mass of the film canister or paper. 2. Add .5 to the mass 3. Use the lab scoop to add the substance until it is balanced 4. Use 15mL of water- (H2O) When we are doing a lab experiment we must look for changes such as change in temperature, change in color, an odor, a precipitate, and or a gas such as bubbles. temp is 21. The final temp 23.0. For CaCl2 + H2O

We measure the triple beam balance to 0. While Nikki got the water. Then we measured the canister. The starting temp is 21. The final temp 23.0. For CaCl2 + H2O. It is 4.3 again. We added .5 to make it 4.8. We measured the b.b to 15 mL. b.b is at 21.9, no color change Paper is 1.2, plus .5 it is 1.7. The canister is 4.1 plus .5 makes it 4.6 we add the NaHCO3. You can see bubbles and hear them. Waters turn to a milk-ish color. Starting temp was 19.4 ending was 20.1. A white solid is forming at the bottom. BB+ NaHCO3- The paper was 1.2, then plus .5 is 1.7. The starting temp is BB 21.5. Ending temp is 19.9 The starting temp of CaCl2 is 21.4. The ending temp is 21.6. One thing we learned was that chemical reactions happen in a lot of different ways. We learned thats 2 solids don't really mix well without a liquid. BB+CaCl2+NaHCO3 make a really cool reation.
 * What we did in the lab: Summary Part 2 **


 * Dependent variable: The signs of a chemical reaction. **


 * Independent Variable: Combination of the chemical in the test tube. **


 * Constants: Amount of liquid (10mL) ** ,** Amount of solid ( Calcium chloride and Sodium bicarbonate ( .5g))  **

** Hypothesis: We all thought that gasses will form and some of the experimental mixtures will bubble. **

 * The procedure ** we had to do to measure the amount of solid was this: 1) zero the balance. 2) place on canister or weighing paper. 3) weigh the canister or weighing paper. 4) Add .5 grams to the mass. 5) Sprinkle the solid into the canister or onto the paper until the balance zeros again **. **
 * O b s e r v a <span style="background-color: transparent; color: #9900ff; font-family: Arial; font-size: 24px; text-decoration: none; vertical-align: baseline;">t <span style="background-color: transparent; color: #ff00ff; font-family: Arial; font-size: 24px; text-decoration: none; vertical-align: baseline;">i <span style="background-color: transparent; color: #ff0000; font-family: Arial; font-size: 24px; text-decoration: none; vertical-align: baseline;">o <span style="background-color: transparent; color: #ff9900; font-family: Arial; font-size: 24px; text-decoration: none; vertical-align: baseline;">n <span style="background-color: transparent; color: #ffff00; font-family: Arial; font-size: 24px; text-decoration: none; vertical-align: baseline;">s **


 * <span style="background-color: transparent; color: #ff00ff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Water + Sodium bicarbonate: Starting temperature: 21.0 The temperature dropped by 1. The sodium bicarbonate sank to the bottom then dissolved.Turned clear and got cooler endothermic reaction. Ending temperature: 19.0 **


 * <span style="background-color: transparent; color: #ff0000; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Water + Calcium Chloride: Starting temperature: 21.0 All dissolved. Temperature went up by 2.0 Ending temperature: 23.0 **


 * <span style="background-color: transparent; color: #0000ff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Bromothymol Blue + (Water) + Calcium Chloride: Starting temperature: 21.9 Turned a lighter blue. Didn’t change that much. Went up by 1.0 Ending temperature: 22.9 **


 * <span style="background-color: transparent; color: #00ff00; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Calcium Chloride + Water + Sodium bicarbonate: Starting temperature: 19.4 Bubbles formed. Hissing, bubbling, popping. Turned milky white. Ending temperature: 20.1 **


 * <span style="background-color: transparent; color: #9900ff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Bromothymol Blue + Sodium bicarbonate: Starting temperature: 21.5 Dissolved in the Bromothymol blue. Ending temperature: 19.9 **


 * <span style="background-color: transparent; color: #ff9900; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Calcium chloride + Sodium bicarbonate: Starting temperature: 21.4 Nothing happened at all because it was two solids combined with out a liquid to bond them. Temperature only increase by .2 Ending temperature:21.6 **

<span style="background-color: transparent; color: #00ffff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;"> <span style="background-color: transparent; color: #00ffff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;"> <span style="background-color: transparent; color: #00ffff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">
 * <span style="background-color: transparent; color: #00ffff; font-family: arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Calcium chloride + Sodium bicarbonate + Bromothymol Blue: Turned yellowish green and bubbled up, began to hiss, bubble, and pop. **