Chemistry Experiment

18-05-17
Experiment 1:

Aim- I want to investigate how temperature effects the rate of reaction

Equipment:

• A beaker, conical flask
• Measuring cylinder
• Stopwatch
• Black cross on paper
• Water bath
• Thermometer
• 0.1mol/L Sodium thiosulfate
• 1.0mol/L Hydrochloric acid

Method:

1. Put the ¨X¨ on the bench mat, and put the conical flask on the paper
2. Measure 50ml of Sodium thiosulfate solution and put it in the beaker
3. Record the temperature of the sodium thiosulfate
4. Measure 5ml of HCL and pour this into the conical flask 
5. Pour the sodium thiosulfate into the conical flask, start the stopwatch and swirl the flask. Time how long it takes for the cross to disappear when viewed from above.
6. Wash out the flask thoroughly
7. Repeat the experiment, using a water bath to heat the sodium thiosulfate to 30*C then 40*C and finally 50*C. Keep the volume of acid the same time. 

Temperature-Time taken

17 - 25.24

30 - 12.22

40 - 10.15

Conclusion:

For a chemical reaction to occur, two or more particles must collide with the correct amount of energy and orientation.

Increasing the temperature of the reactants gives the particles more kinetic energy, which means it has more of a successful chance of collisions.

23-05-17

Experiment 2:

Aim: I aim to investigate the effect of concentration on the rate of reaction

Equipment:

• Conical flask
• Measuring cylinder
• Stopwatch
• Black cross on paper
• 0.2mol/L Sodium thiosulfate
• 1.0mol/L Hydrochloric acid

Method: 

1. Put the ¨X¨ paper on the bench mat, and put the conical flask on top of the paper
2. Measure 10mL of sodium thiosulfate solution and put it into the conical flask
3. Measure 40mL of water and put into the conical flask. Swirl the flask to mix the contents. 
4. Measure 5mL of acid. Pour the acid into the flask, start stopwatch, and swirl the flask. Time how long it takes for the cross to disappear
5. Wash out the flask thoroughly. Repeat the experiment using the other volumes of sodium thiosulfate and water in the table. Keep the volumes of acid the same each time

Results:

Volume of thiosulfate (mL)	Volume of water (mL)	Time Results (Seconds)
10	40	540
20	30	90
30	20	60
40	10	42
50	0	35

Conclusion: 

For a chemical reaction to occur, two or more particles must collide with the correct amount of energy and orientation.

Increasing the concentration of the reactants means there are more reactant particles. This means there will be a higher frequency of successful collisions and increase of the reaction rate

24-05-17

Experiment 3:

Aim:

Equipment:

• Boiling tube
• Calcium Carbonate chips and powder
• Hydrochloric acid
• Measuring cylinder
• Spatula

Method:

1. Measure 2mL of Hydrochloric acid and pour this into your boiling tube
2. Holding your boiling tube over a sink or heatproof mat, add a pea-sized amount of calcium carbonate powder to your boiling tube. Record your observations..                                                                     Observation of CaCo₃-
3. Repeat the experiment, but this time use a chip of calcium carbonate that is roughly the same size as the spatula of powder you used previously. Record your observations...                                                 Observation of CaCO₃ - 

Conclusion: