Rust Experiment Photos (there are photos from 4 days)
photos from Monday (last day of the experiment)
Jar F
After liquid was removed.
above : Jar E with liquid removed
left: Jar G with liquid removed
left: Jar G with liquid removed
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Rust Experiment
Photos taken on Friday afternoon.
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photos of rust experiment - after the second day
photos of rust experiment - after the second day
photos of rust experiment
after 1 day
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Writing the Lab Report
Questions for lab report due 12 Jan 2011
Reaction rates
Part 1
1. Qualitatively compare the gas evolved before and after the addition of the cobalt chloride.
2. Explain what the changes in colour mean.
3. What evidence showed that cobalt chloride was a catalyst?
Part 2
4. How were the instantaneous rate at t = 0, and the average rate of reaction affected by the change in surface area?
Part 3
5. On the top half of a piece of graph paper, graph time vs. temperature. On the bottom half, graph the reciprocal of time (or 1/t) vs. Temperature (dependent variable on the the Y-axis).
6. What is the relationship between time of reaction and rate of reaction? On your graph, how many degrees C does it take to double the reaction rate at time = t.
7. What effect did temperature have on the reaction rate? (relate to correct graph and remember answer to #6)
8. Use collision theory to explain this answer.
Part 4
9. Calculate the concentration of HYPO and acid in each case after the two solutions were mixed. Put in table form.
10. On the top half of a piece of graph paper, graph time vs. HYPO concentration. On the bottom half of the graph paper graph the reciprocal of time (or 1/t) vs. HYPO concentration.
11. Calculate the rate constant from the correct graph.
12. What was the effect of altering the HYPO concentration on the rate? Use collision theory to explain this.
13. In two cases the HYPO concentration was the same, but the acid concentration was altered. Form a hypothesis to explain the effect that was observed.
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Due on Monday, 13 Dec.
1. Purpose of the experiment
2. Materials used
3. Method used
4. Observations that you made
5. Answer the questions on page 86 under Evidence
6. Conclusions
Reaction rates
Part 1
1. Qualitatively compare the gas evolved before and after the addition of the cobalt chloride.
2. Explain what the changes in colour mean.
3. What evidence showed that cobalt chloride was a catalyst?
Part 2
4. How were the instantaneous rate at t = 0, and the average rate of reaction affected by the change in surface area?
Part 3
5. On the top half of a piece of graph paper, graph time vs. temperature. On the bottom half, graph the reciprocal of time (or 1/t) vs. Temperature (dependent variable on the the Y-axis).
6. What is the relationship between time of reaction and rate of reaction? On your graph, how many degrees C does it take to double the reaction rate at time = t.
7. What effect did temperature have on the reaction rate? (relate to correct graph and remember answer to #6)
8. Use collision theory to explain this answer.
Part 4
9. Calculate the concentration of HYPO and acid in each case after the two solutions were mixed. Put in table form.
10. On the top half of a piece of graph paper, graph time vs. HYPO concentration. On the bottom half of the graph paper graph the reciprocal of time (or 1/t) vs. HYPO concentration.
11. Calculate the rate constant from the correct graph.
12. What was the effect of altering the HYPO concentration on the rate? Use collision theory to explain this.
13. In two cases the HYPO concentration was the same, but the acid concentration was altered. Form a hypothesis to explain the effect that was observed.
-------------------------------------
Due on Monday, 13 Dec.
1. Purpose of the experiment
2. Materials used
3. Method used
4. Observations that you made
5. Answer the questions on page 86 under Evidence
6. Conclusions