MINISTRY OF EDUCATION
MUMBWA DAY SECONDARY SCHOOL
DEPARTMENT NATURAL SCIENCES
CHEMISTRY SCHOOL BASED ASSESSMENT WORK SHEET
NAME……………………………………………………………………….TASK……………
EXAMINATION NO………………………………………… DURATION: 40 MINUTES.
TITLE: CHEMICAL KINETICS (RATES OF CHEMICAL REACTIONS)
AIM: To investigate the reaction rate of the reaction between hydrochloric acid and
calcium carbonate by measuring the amount of carbon dioxide produced in a given
time.
INTRODUCTION
Rate of a chemical reaction the speed at which a chemical reaction proceeds. It is often
expressed in terms of either the concentration (amount per unit volume) of a product
that is formed in a unit of time or the concentration of a reactant that is consumed in a
unit of time. Alternatively, it may be defined in terms of the amounts of the reactants
consumed or products formed in a unit of time.
MATERIALS /APPARATUS
1. Calcium carbonate.
4. Water trough
2. 1M dilute hydrochloric acid
5. Delivery tube and conical flask
3. Clamp stand
6. Graduated measuring cylinder
7. Stop watch
METHOD
1. In this experiment you are required to determine the volume of the gas
produced when 1M hydrochloric acid reacts with excess calcium
carbonate (marble chips). Using the stop watch record the volume of the
gas being produced every 20s until the reaction is complete in the table
below.
Volume of
gas in cm3
Time in
seconds (s)
[2]
a) Name the gas that was being produced as calcium carbonate reacted
with the acid……………………………………..…………………………[1]
b) Using a graph paper plot a graph to show the rate of the reaction
between calcium carbonate and hydrochloric acid
[3]
c) Write a balanced chemical equation including state symbols to show
the reaction that occurs between calcium carbonate and hydrochloric
acid and derive the ionic equation.
Balanced chemical equation
…………………………………………………………………………………
……………………………………………………………………………….[1]
Net ionic equation
…………………………………………………………………………………
……………………………………………………………………………....[1]
d) Calculate the rate of the reaction after 40s
…………………………………………………………………………………
…………………………………………………………………………………
…………………………………………………………………………………
………………………………………………………………………………[2]