Abstract:

We conducted this experiment to find and calculate the enthalpy using heat. One of the problems being addressed was finding out the mass of the styrofoam calorimeter and the magnesium ribbon. The biggest thing we had to find was the temperature of the HCl when the Magnesium was inside of it. The result was that the temperature kept rising until the time hit 2:15-3:00. Overall, we found the missing temperatures and the mass of the colorimeter and the magnesium ribbon.

Safety Considerations:

• Roll up your sleeves so you won't get any chemicals from the lab on your clothes
• Tie your hair back so the chemicals won't get in your hair
• Wear safety glasses so you won't get anything in your eyes

Materials:

• Styrofoam Colorimeter
• 1.0M HCl (Needed 50mL HCL)
• Magnesium Ribbon
• Thermometer
• Spark Temperature Prob
• Test Tube
• Graduated Cylinder

Procedure:

Collect all equipment and put on your safety glasses. Measure out 50.0mL of 1.0M HCl and pour into a pre-weighed calorimeter. Record the mass of the calorimeter + HCl. Record the starting temperature of the HCl. Measure out no more than 0.2g of magnesium ribbon. Record the actual mass. Roll up the Mg ribbon into a loose ball. When ready, place the Mg into the HCl. Quickly place BOTH lids on the calorimeter and slide the thermometer probe into the reaction mixture. Record the temperature every 15 seconds, until the reaction is complete (you'll be able to hear the gas being given off when it's reacting). When the reaction is complete, record the final temperature. Rinse off the thermometer probe and pour the reaction mixture into the waste container, with an equal volume of tap water to neutralize any remaining acid. Clean off your lab table and return to our seats and do this lab write up.

Evidence Collected:

Colorimeter - 26.90

Colorimeter w/ HCl - 76.45

15sec - 26.8

30sec - 29.8

45 sec - 31.1

1 min - 32.5

1:15 - 37.4

1:30 - 39.3

1:45 - 40.8

2 min - 41.5

2:15 - 3 min - 41.8

1.) 2HCl + Mg --> MgCl + H2

2.) Q= m x T x c

       = 41.55 x 15 x 4.2

       = 3121.65

3.) 3121.65J x 1kJ/1000J = 3.12165kJ

4.) 2g x 1 mol/29.050 = .0082276

5.) kJ/mol = 3.12165kJ/.0082276 = 37935kJ/mol

6.) H = (-801.15) + 0 - 8(-167.2) + 0

        = -466.75kJ

7.) Observed - Actual/Actual x 100 = 379.35 - 466.75/466.75 x 100 = -18.72522

Abstract: In this lab, we had to verify  beer's law by determing the concentration of unknown copper sulfate solution. One problem that we had in this lab was cleaning the test tubes. The reason why this was a problem was because if it wasn't clean, we couldn't use the tube. A method we used to fix the problem was to put water in the tubes then put a paper towel through to get everything out. 

Safety Considerations: Wear goggles at all times. Roll up long sleeve shirts and tie long hair back so they don't get caught in the chemicals or fires.

Materials:Test Tubes . CuSO4, Colorimeter,

Procedure: We used the CuSO4 for some tests. We put the CuSO4 in a small jar and filled it all the way up, next thing we did was put it in the colorimeter to see the percent we should get.

Evidence Collected: For the CuSO4, we got the percent of 0.395%

Claim:The concentration of the unknown copper sulfate solution we found is 0.395%

Scientific Explanation:

When I was reading through this "Mistake" story, it's crazy how things are. When you make a mistake, you learn from it. I been in a class like this before in middle school. Everytime we made a mistake or was wrong, the teacher or students helped us by giving us the right answer and learning how it's the right answer. I wish all classes were like this because if we had classes like this, classes would be way easier. Also, everybody would get what they're doing instead of being all confused and behind on your homework all the time.

research question:In what locations will the given objects be found when dropped into the density column? 

abstract:This experiment was conducted to see if the objects that we were given would either float or sink. Also we would see how where they would land in the density column. A method we used in our experiment was water displacement to find the volume of an object. I thought the steel brass and wax would end on the bottom, zinc in the middle, and acrylic and cork would end at the top. In conclusion, everything was right except for the zinc because that ended up at the bottom.

safety considerations: If you have long sleeves or long hair, put it back so it doesn't get caught or doesn't get anything on either your hair, skin, or clothes. If you get hurt or cut in a lab, go to Mr. Hall ASAP. Go through all the instructions and don't skip and instructions.

materials: Materials we needed to do this experiment was a cylinder, to find the mass and measure where the objects would land. We needed the Internet because some of the masses and volumes we couldn't find so we used the Internet to get it. Another thing we used was our paper to jot down the things we discovered in our experiment like mass, volume, and the density. 

procedure: The first thing we did in this experiment was find the mass of corn syrup, water and canola oil. Then, we found the mass of zinc, acrylic, brass, steel, wax and cork. After we found the mass of each object I found the volume of each of the objects. After finding the volume of each  object, we found the density by dividing the mass by the volume to get our density. After we got all the evidence we needed, we put them one by one in a cylinder to see where each object would land in the cylinder.

evidence collected:We found the mass of zinc, acrylic, brass, steel, wax and cork. After we found the mass of each object I found the volume of each of the objects. After finding the volume of each  object, we found the density by dividing the mass by the volume to get our density.

claim: Wax Cork and LDP (Low Density Polyethylore) landed on the top of the cylinder where the canola oil was. Acrylic landed in the middle of the cylinder where the water was, and zinc, steel, brass, and corn syrup landed on the bottom of the cylinder where the corn syrup was.

scientific explanation: Wax Cork and LDP (Low Density Polyethylore) landed on the top of the cylinder where the canola oil was because of how light the objects were. Acrylic landed in the middle of the cylinder where the water was because of how much the object weighed, and zinc, steel, brass, and corn syrup landed on the bottom of the cylinder where the corn syrup was because of how much mass and density was in the objects.

resources: Internet, Mr. Hall and other students.