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.

Answer 1

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)