Question 2(a)(iii)
Some oxides of some elements are listed.
Answer the following questions using only oxides from the list. Each oxide may be used once, more than once or not at all.
Give the formula of an oxide
which is coloured,
IGCSE Chemistry Extended 8.4.1—Transition elements as metals that Topic Practice
8.4.1—Transition elements as metals that
• Describe transition elements as metals that: (a) have high densities (b) have high melting points (c) form coloured compounds (d) often act as catalysts as elements and in compounds
Question 2(a)(iii)
[Maximum number: 1]
A list of five metals is shown.
A list of five metals is shown.
\title{
copper \\ iron \\ magnesium \\ potassium \\ silver
}
All metals form positive ions.
Suggest one of the five metals in the list which is not likely to show catalytic properties.
Question 2(b)
[Maximum number: 2]
Cobalt and copper are transition elements.
One physical property of transition elements such as copper and cobalt is that they are hard. Other metals such as lithium are softer.
State two other physical properties of copper and cobalt which are significantly different from lithium.
1
2
Question 3(a)(i)
[Maximum number: 2]
Sodium is in Group I of the Periodic Table.
Describe two physical properties of sodium which are different from the physical properties of transition elements such as copper.
1
2
Question 3(c)
[Maximum number: 2]
Zinc and copper are elements next to each other in the Periodic Table.
Copper is a transition element. It can have variable oxidation states.
State two other chemical properties of transition elements which make them different from Group I elements.
1
2
Question 3(b)(i)
[Maximum number: 1]
This question is about nitrogen and some of its compounds.
Ammonia is converted into nitric acid.
The first stage of this conversion uses a catalyst and occurs at a temperature of and a pressure of 5 atmospheres.
The forward reaction is exothermic.
Suggest which of the following elements is most likely to be used as a catalyst. Draw a circle around your answer.
Question 4(e)(i)
[Maximum number: 1]
Hydrogen iodide thermally decomposes into iodine and hydrogen. The reaction is reversible.
Fig. 4.1 shows a gas syringe containing a mixture of hydrogen iodide, iodine and hydrogen gases. The gas syringe is sealed and the mixture is heated to . The mixture of gases reaches equilibrium and is purple.
Fig. 4.1
Methanol is manufactured by reacting carbon monoxide with hydrogen.
The rate of formation of methanol increases when a catalyst is used.
Choose from the list the element that is most likely to be used as the catalyst.
Draw a circle around your chosen answer.
calcium carbon copper sodium sulfur
Question 22
[Maximum number: 1]
Which row describes the properties of a typical transition element?
melting point
variable oxidation
number
can act as a
catalyst
high
no
no
high
yes
yes
low
no
yes
low
yes
no
Question 23
[Maximum number: 1]
Which of the following could be a transition element?
melting point
in
density in
colour
electrical
conductor
114
4.9
purple
no
659
2.7
grey
yes
1677
4.5
grey
yes
3727
2.3
black
yes
Question 3
[Maximum number: 2]
Cobalt is a transition element. Potassium is in Group I of the Periodic Table.
Question 3(b)(i)
(a)
State one physical property that is different for cobalt and potassium.
[ 1 ]
Question 3(b)(ii)
(b)
Describe how the physical property given in (b)(i) is different for cobalt compared to potassium.
[ 1 ]