B. Heating Copp Carbonate Upon being heated, some substances undergo chemical changes, some are changed physically, and others do not change at all In this part and Part C, you Procedure will investigate the effect of heating substances. 1. Weigh out two samples of solid copper carbonate (CuCO with masses of about 0.1 g. Put each sample into a separate small (10-cm), dry test tubes Note the color of the soid and record it in Table 43 under the "Unheated Sample" heading 2. Tap the tubes on the bench top so any sample clinging to the sides falls to the bottom. 3. Test the sample in one test tube by adding 15 drops of dilute (6 M) hydrochloric acid (HCl). Agitate the tube until the sample completely disalves. Record what you observed happen during this lest in Table 4.3 HYDROCHLORIC ACID IS VERY CORROSIVE. IF YOU GET AN ON YOUR SKIN WASH IT OFF IMMEDIATELY WITH COLD WATER AND INFORM YOUR INSTRUCTOR 4. Mount the other test tube on a ringstand as shown in Figure 4.2 and heat the sample very strongly with a burner for a minimum of 5 minutes. 5. Allow the tube to cool for at least 10 minutes. Record the color of the heated sample in Table 4.3 under the "Heated Sample" heading. 6. Test the sample, which has been changed by heating, by following the directions given in Step 3. Record the results of the test in Table 4.3.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter4: Energy And Chemical Reactions

Section: Chapter Questions

Problem 84QRT: Oxygen is not normally found in positive oxidation states, but when it is combined with fluorine in...

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4. A student performs the HCl tests on the three solid samples as described in Step 5 of Part B and gets the same result for the solid CaCO₃ sample and the mixture. Which of the following statements is true concerning these results?

a. The results are to be expected.

b. The results are not expected and could have been caused by using contaminated HCl.

c. The results are not expected and could have been caused by using contaminated samples.

Explain your answer.

B. Heating Copp
Carbonate
Upon being heated, some substances undergo chemical changes, some are
changed physically, and others do not change at all In this part and Part C,
you
Procedure
will investigate the
effect of heating substances.
1. Weigh out two samples of solid copper carbonate (CuCO
with masses of
about 0.1 g. Put each sample into a separate small (10-cm), dry test tubes
Note the color of the soid and record it in Table 43 under the "Unheated
Sample" heading
2. Tap the tubes on the bench top so any sample clinging to the sides falls
to the bottom.
3. Test the sample in one test tube by adding 15 drops of dilute (6 M)
hydrochloric acid (HCl). Agitate the tube until the sample completely
disalves. Record what you observed happen during this lest in Table 4.3
HYDROCHLORIC ACID IS VERY CORROSIVE. IF YOU GET AN
ON YOUR SKIN WASH IT OFF IMMEDIATELY WITH COLD
WATER AND INFORM YOUR INSTRUCTOR
4. Mount the other test tube on a ringstand as shown in Figure 4.2 and heat
the sample very strongly with a burner for a minimum of 5 minutes.
5. Allow the tube to cool for at least 10 minutes. Record the color of the
heated sample in Table 4.3 under the "Heated Sample" heading.
6. Test the sample, which has been changed by heating, by following the
directions given in Step 3. Record the results of the test in Table 4.3.

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