Lab 5B

Objectives:

1.       To observe a variety of chemical reactions

2.       To interpret and explain observations with balanced chemical equations

3.       To classify each reaction as one of the four main types

Material and Equipment:

Refer to page 33 in Health Lab Text, Lab 5B

Procedure:

  Refer to page 33 in Health Lab Text, Lab 5B

Data and Observation:

  Attached to the back.

Analysis of results:

1.       Copper reacts with oxygen in the air.

2.       The solution become lighter blue indicates the concentration of CuSO4 in the solution decreased.

3.       The colour changes in reaction 3&4, which means new substance was yielded.

4.       The precipitate was CaCO3.

5.       Put a glowing (not burning) splint into the mouth of the test tube, the splint will start a flame. That shows the identity of supporting combustion.

6.       A. has the identity of supporting combustion.

B. Water.

Follow-up questions

1.       CdSO4+ZnàZnSO4+Cd

2.       2H2Oà2H2+O2 (decomposition)

Conclusion

1.       2Cu+O2à2CuO (synthesis)

2.       2Fe+3CuSO4àFe2(SO4)3+3Cu (single replacement)

3.       CuSO4·5H2OàCuSO4+5H2O  (decomposition)

4.       CuSO4+5H2Oà CuSO4·5H2O (synthesis)

5.       CaCl2+Na2CO3àCaCO3+2NaCl (double replacement)

6.       Zn+2HClàZnCl2+H2 (single replacement)

7.       2H2O2+(MnO2)à2H2+O2+(MnO2*) (decomposition)  (*=catalyst)