CHEMISTRY 12 WORKSHEET 1.2
Reaction Rates
1. In each of the following pairs of reactions, which would have the faster reaction rate?
a) H2(g) + I2(g) à 2HI (g) or Ag+(aq) + I-(aq) à AgI(s)
b) Fe(s) + 2H2O(l) à Fe(OH)2(s) + H2(g) or CH3COOH(aq) + H2O(l) à CH3COO-(aq) + H3O+(aq)
c) Cu(s) + S(s) à CuS(s) or CaO(s) + H2O(l) à Ca(OH)2(s)
d) C(s,powder) + O2(g) à CO2(g) or C(s,chunks) + O2(g) à CO2(g)
e) H+(aq) + OH-(aq) à H2O(l) or 2H2O2(aq) + 2H+(aq) à 2H3O+(aq) + O2(g)
2. A 5.0 g sample of magnesium completely reacts with HCl after 150 s. What is the average rate of consumption of magnesium in g/min?
3. How long in seconds will it take to completely react 45.0 g of calcium carbonate with dilute HCl if the reaction proceeds at a rate of 2.35 g/min?
4. The electrolysis of water produces oxygen at a rate of 32.5 ml/min. What volume of hydrogen can be produced in 7.50 min
5. The following date was obtained for the reaction between Alka Seltzer and water. Find the average rate of formation in g/min for the time between 0 and 20 s.
Time (s) / Mass (g)0 / 150 .00
10 / 149.94
20 / 149.88
6. If the rate of consumption of hydrogen under certain conditions is 0.200 L/min, what is the rate of production of HCl?
7. If the average rate or consumption of hydrogen is 3.00 mol/s. What is the average rate of production of hydrobromic acid in g/min?
8. If the average rate of consumption of nitric acid in magnesium is 2.55 L/min, How many L of hydrogen are produced in 180 s?
9. When measuring the rate at which the mass of copper metal decreases during a reaction with nitric acid
a) Why can’t you just put the vessel on a digital balance and record the decrease in mass as the copper is used up?
b) Why can’t you just measure the decrease in mass on a digital balance if the vessel was closed?