Page 48 - Spotlight A+ Form 4 & 5 Chemistry KSSM

Which substance has the above properties at Which of the following substances match the
room temperature? observation in Table 6.2?

Melting Boiling Solution X Solution Y Solution Z
Substances
point (°C) point (°C) A Sodium Soap
A W 120 2.4 hydroxide solution Lime juice
B X –36 27 B Lime juice Soap Potassium
C Y 12 40 solution hydroxide
D Z –79 –5 C Ammonia Sodium Lime juice
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solution hydroxide
38. Figure 15 shows the apparatus set up to study the D Potassium Soap
reaction of chlorine, Cl and iron, Fe. A brown hydroxide Lime juice solution
2
solid is produced at the end of the reaction.
8.4 g of iron wool (ferum) Soda lime
40. Table 7 shows three experiments carried out
Chlorine gas, to investigate the effect of other metals on the
Cl rusting of iron.
2
Combustion tube
Heat Set Experiment Observation
Figure 15 I Low intensity of
Determine the mass of the brown solid formed. blue spot
[Relative atomic mass: Cl = 35.5; Fe = 56] Iron nail
A 12.1875 g
SPM MODEL PAPER 39. Table 6.1 shows the colour changes for three II Jelly solution + potassium High intensity of
B 13.7215 g
Metal P
C 16.25 g
D 24.375 g
hexacyanoferrate(III) solution
types of indicators.

in pH 2
Indicator Colour Colour in pH Iron nail blue spot
12 solution
solution
Metal Q
Phenolphthalein Colourless Pink
Jelly solution + potassium
Methyl orange Red Yellow hexacyanoferrate(III) solution
Universal Red Dark blue III No changes
indicator

Table 6.1 Iron nail
Table 6.2 shows the colours of three indicators in Metal R
solutions X, Y dan Z.
Solution Jelly solution + potassium
hexacyanoferrate(III) solution
Table 7
Which of the following is the correct sequence,
in ascending order of metals P, Q and R in terms
of tendency to form ions?
Solution X + Solution Y + Solution Z + A P, Q, R
phenolphthalein methyl universal B R, P, Q
orange indicator
C Q, P, R
Colour Pink Red Dark blue D Q, R, P

Table 6.2
530