Answers to Practice Questions in Textbook (chapter 1)

Structured Questions (Textbook pg16)

1.(a) Burette
(b) Beaker
(c) Test tube
(d) Measuring cylinder

2. (a) (i) Cubic metre, m3
(ii) It is a very large unit and so is less
convenient for the smaller volumes of
liquids usually encountered in Chemistry
experiments.

(b) (i) Cubic centimetre
(ii) cm3

(c) (i) Burette
(ii) To 0.1 cm3

3. (a) 53 cm3

(b) To the nearest cm3
(At ‘O’ Level, the volume in a 100 cm3
measuring cylinder is measured to the nearest
cm3 though more accurate readings may be
possible, e.g. 53.4 cm3.)

(c) In a burette, the gradations are reversed. The
zero is at the top of a burette, whereas it is at
the bottom of a measuring cylinder.

4. Balance, gram(g)
Thermometer, degree celsius(oC)
Measuring cylinder, cubic centimetre (cm3)
stopwatch, seconds (s)

5. (a) X – temperature sensor/probe.
Y-connector/interface/data logger.
Z – computer.
(b) (i) To measure the temperature of the reaction
mixture
(ii) To display the data on the monitor/screen,
often in the form of a graph
(c) (ii) Vertical axis – temperature. Horizontal  axis – time.

6. (a) During the reaction, the (carbon dioxide) gas
produced escapes from the flask.

(b) (i) Vertical axis – mass. Horizontal axis – time.

(iii) As the speed of the reaction decreases with time,
the gradient of the graph decreases. When the
reaction ends, the graph is flat/horizontal.

Free Response Question (Textbook pg17)

Place a bag of silica gel on a balance connected to a computer to record its mass over a period of time. The mass increases as water is absorbed. Plot a graph of mass against time. When the mass stops increasing, the silica gel is no longer absorbing wate