1963
Chemistry
Ordy
SCOTTISH CERTIFICATE OF EDUCATION
SCIENCE
Chemistry
Ordinary Grade
Friday, 10th May—9.30 a.m. to 12 noon
Answer any FIVE questions.
Answers should be supplemented by equations
wherever possible, and should be illustrated, where
appropriate, by clear diagrams of reasonable size.
Marks may be deducted for bad spelling and bad
punctuation, and for writing that is difficult to read.
The value attached to each question, or to each part of
a question, is shown in the margin.
Atomic numbers and approximate values of Atomic
weights will be found in the book of Mathematical
Tables.
Marks
(a) What is the effect of adding dilute hydrochloric acid to a mixture of iron
filings and sulphur (i) before heating the mixture, (ii) after heating the
mixture ? (4)
(b) Write a brief note, without equations, on the ease with which calcium,
copper, and zinc combine with oxygen.
What would be the result of adding zinc to a solution of copper sulphate,
and to a solution of calcium chloride ? (7)
(c) Write the chemical formulae for (i) caustic soda, (ii) ammonium sulphate,
and state one important use of one of these substances. (3)
(<i) Describe two experiments to show that sugar contains carbon. Why is
sugar an important constituent of our diet ? (6)
(«) How would you show experimentally the conditions necessary for the
rusting of iron ? Explain where rusting would be most noticeable in
... J6*-1168 with iron frameworks.
with sulphur and magnesium to illustrate
. ^ ! of non-metals and metals. State two physical
properties of mercury which indicate that it is a metal.
?itline two experiments
inering chemical Drooerth
(10)
(10)
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