Topic 5b Transition metals and alloys Flashcards
1 Which are usually good conductors of electricity, metals or non-metals?
metals
2 What can you say about the melting points of metals compared with non-metals?
They are high.
3 Are most metals shiny or dull when freshly cut?
shiny
4 Why do lumps of most metals sink in water?
They have high densities/are denser than water.
5 What gas is produced when a metal reacts with an acid?
hydrogen
6 What catalyst is used in the Haber process?
iron
7 What orange-brown substance is formed when iron reacts with air and water?
rust/hydrated iron(III) oxide
8 What happens to the mass of a catalyst when it catalyses a chemical reaction?
It stays the same.
9 The melting point of a substance is 39 °C and its boiling point is 356 °C. What is its state at room temperature?
liquid (it has melted but it hasnt yet boiled)
10 What non-metal element is used to extract iron from iron ore?
carbon
11 In which part of the periodic table is iron placed?
transition metals
12 What can you say about the melting point of a typical transition metal?
It is high.
13 What is oxidation?
gain of oxygen/loss of electrons
14 What colour is rust?
brown/orange-brown
15 What gas element is needed for iron to rust?
oxygen
16 What colourless compound is needed for iron to rust?
water
17 Which is more reactive, zinc or iron?
zinc
18 Which is more reactive, copper or iron?
iron
19 Is common salt, sodium chloride, needed for iron to rust?
no
20 When a metal corrodes, is it oxidised or reduced?
oxidised
21 Are metals shiny or dull when freshly cut?
shiny
22 In general, what can you say about the densities of transition metals?
They are high.
23 When metals corrode, are they oxidised or reduced?
oxidised
24 What two substances are needed for iron to rust?
oxygen/air and water
25 Which metal is used in sacrificial protection of iron: zinc or tin?
zinc (zinc is more reactive than iron)
26 What is the common name for hydrated iron(III) oxide?
rust
27 Which method of rust prevention is most suitable for a car engine: painting, oiling or coating with plastic?
oiling
28 Are metal ions positively charged or negatively charged?
positively charged
29 What name is given to the negative electrode in electrolysis?
cathode (PANIC!)
30 What name is given to the liquid through which a current flows during electrolysis?
electrolyte
31 How are the atoms arranged in a piece of solid metal?
regularly/in layers/in a lattice/close together
32 Which metal is more reactive, iron or zinc?
zinc
33 Is the corrosion of a metal an example of oxidation, or reduction?
oxidation
34 What is the corrosion of iron called?
rusting
35 Give one reason for electroplating a metal object with another metal.
to improve its appearance/corrosion resistance
36 Why is stainless steel used for cutlery and kitchen sinks?
It does not rust.
37 Which metal has the higher melting point, iron or magnesium?
iron
38 Which metal has the higher density, sodium or iron?
iron
39 Which metal is more suitable for the sacrificial protection of iron; copper or zinc?
zinc
40 Between which two groups in the periodic table are the transition metals placed?
groups 2 and 3
41 Which metal is more reactive, copper or gold?
copper
42 Compared with other metals, do transition metals have high density or low density?
high density
43 Iron(II) chloride exists as green crystals. How can you tell that iron is a transition metal?
It forms coloured compounds.
44 Mercury melts at -39 °C. Why is this unusual?
It is a metal/metals are usually solid/have high melting points.
45 Why is stainless steel an alloy?
It is a mixture of metals.
46 What often happens to the strength of a metal when it is converted into an alloy?
It increases/gets stronger.
47 Name the process that uses electricity to put a thin coat of a metal on another metal.
electroplating
48 What happens to iron if it is exposed to air and water?
It rusts/corrodes.
49 Give one common use of gold.
jewellery/electrical connectors/coins or bars for investment
50 Which is stronger, wrought iron or steel?
steel
