For each of the following, i. Identify the type of reaction using the letters de

Question

For each of the following,

                  i.    Identify the type of reaction using the letters designated below:

                        –    Precipitation Reaction (P)

                        –    Acid-Base Neutralization Reaction (N)

                        –    Oxidation-Reduction (Redox) Reaction (R)

                  ii.    Balance the equation

TYPE

______      A. ______ Al (s)   + ______ H2SO4 (aq)   Þ   ______ H2 (g) + ______ Al2(SO4)­3 (aq)

______      B. ______ C5H12 (l) + ______ O2 (g)   Þ    ______ CO2 (g)    +   ______ H2O (g)

______      C. ______ Cu(NO3)2 (aq) + ______ NaOH (aq)   Þ ______ Cu(OH)2 (s) + ______ NaNO3(aq)

______      D. ______ Zn (s) + ______ CuSO4 (aq)   Þ   ______ Cu (s) + ______ ZnSO4 (aq)

______      E. ______ Sr(OH)2 (aq) + ______ HNO3 (aq)   Þ   ______ H2O (l) + ______ Sr(NO3)2 (aq)

         Match the following descriptions with one of the chemical equations given in question #7 above,

                  and give the letter (A, B, C, D or E) of the corresponding equation:

         ______   i.    A thin, shiny, silvery metal is placed in a clear solution. Bubbles begin to form.

         ______   ii.    A few drops of phenolphthalein are added to a clear solution in a test tube. The solution turns pink. Another clear solution is added to the first solution until the solution becomes colorless.

         ______   iii.   A small piece of shiny, silvery metal is placed in test tube containing a bright blue solution. After about 15 minutes, a reddish-brown solid is found at the bottom of the test tube, and the solution is less blue. None of the silvery metal remains.

         ______   iv. A small amount of a liquid and a gas are placed in an appropriate container. The contents of the flask are ignited at >100ºC until the liquid completely disappears.

         ______   v.   A bright-blue solution is poured into a clean test tube. A clear solution is poured into the same test tube, and the resulting mixture is cloudy and royal blue in color.

Explanation / Answer

i.

2 Al (s) + 3 H2SO4 (aq.) ----------> Al2(SO4)3 (aq.) + 3 H2 (g)

Redox reaction

ii.

C5H12 (l) + 8 O2 (g) -----------> 5 CO2 (g) + 6 H2O (g)

Redox reaction

iii.

Cu(NO3)2 (aq.) + 2 NaOH (aq.) ----------_> Cu(OH)2 (s) + 2 NaNO3 (aq.)
Precipitation reaction

iv.

Zn (s) + CuSO4 (aq.) -----------> ZnSO4 (aq.) + Cu (s)
Redox reaction

v.

Sr(OH)2 (aq.) + 2 HNO3 (aq.) --------> Sr(NO3)2 (aq.) + 2 H2O (l)

Acid - base neutralisation

i. (A)

ii ((E)

iii ((D)

iv. (B)
v. (C)

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