S2.3 The metallic model questions for IB Chemistry
62 questions on The metallic model, written by Augment in the style of IB exam papers. Six of them are below in full, to answer on paper.
- IB Chemistry
- Part of S2 Models of bonding and structure
- SL and HL
Questions by paper and level
SL and HL questions are for students at either level. HL only questions cover what only HL students study.
| Paper | SL and HL | HL only | All |
|---|---|---|---|
| Paper 1A | 22 | 7 | 29 |
| Paper 1B | 8 | 2 | 10 |
| Paper 2 | 16 | 7 | 23 |
| Every paper | 46 | 16 | 62 |
Counted on
Questions to try
Written by Augment in the style of IB exams, not past papers. Answer them on paper, then check each one against its markscheme with a free account.
Brass is an alloy of copper and zinc. Different samples of brass contain between about 55 % and 95 % copper by mass. Which term describes brass?
A student determined the melting point of tin from a cooling curve.
25 g of tin pellets were melted in a boiling tube heated by a Bunsen burner.
The heat was removed and a thermocouple connected to a data logger was placed in the molten tin.
The temperature was recorded every 30 s as the tin cooled and solidified.
Time / s | Temperature / °C ± 0.1 °C |
|---|---|
0 | 268.4 |
30 | 255.1 |
60 | 243.0 |
90 | 233.6 |
120 | 229.8 |
150 | 230.9 |
180 | 231.0 |
210 | 230.9 |
240 | 230.8 |
270 | 230.6 |
300 | 230.2 |
330 | 224.7 |
360 | 214.9 |
390 | 206.3 |
- (a)
State the melting point of tin obtained from these data.
1 mark
- (b)
Explain why the temperature stays almost constant between 150 s and 300 s.
2 marks
- (c)
The literature value of the melting point of tin is 231.9 °C. Calculate the percentage error in the student's value.
1 mark
- (d)
Suggest why the temperature at 120 s is lower than the temperatures recorded between 150 s and 270 s.
1 mark
- (e)
The thermocouple was later found to read 1.0 °C too low at every temperature. State the type of error this causes and deduce the corrected melting point.
2 marks
- (f)
Suggest why this method could not be used to determine the melting point of iron in a school laboratory.
1 mark
Some data for the group 1 elements are shown. The melting point of rubidium has been omitted.
Element | Li | Na | K | Rb | Cs |
|---|---|---|---|---|---|
Melting point / °C | 180.5 | 97.79 | 63.38 | 28.44 | |
First ionization energy / kJ mol−1 | 520 | 496 | 419 | 403 | 376 |
- (a)
Predict the melting point of rubidium.
1 mark
- (b)
Explain the decrease in melting point down group 1.
2 marks
- (c)
Write the equation for the reaction of rubidium with water.
1 mark
- (d)
Predict, with reference to the data, how the reaction of caesium with water compares with that of rubidium.
1 mark
- (e)
Rubidium oxide, , dissolves in water. Write the equation for this reaction and state the effect of the solution on the pH.
2 marks
- (f)
Calculate the pH of a 0.0100 mol dm−3 solution of rubidium hydroxide at 298 K.
1 mark
The properties of four substances are shown.
Substance | Melting point / °C | Conducts when solid? | Conducts when liquid? | Conducts in water? |
|---|---|---|---|---|
W | −114 | no | no | yes |
X | 1083 | yes | yes | insoluble |
Y | 801 | no | yes | yes |
Z | 1610 | no | no | insoluble |
Which substance is ionic?
A student compared how well four metals conduct heat. Rods of copper, aluminium, brass and steel, each 20.0 cm long and 6.0 mm in diameter, were used.
A drawing pin was fixed to each rod with a small blob of wax, 15.0 cm from one end.
That end of the rod was placed in a beaker of boiling water and a stopwatch was started.
The time for the wax to melt and the pin to fall was recorded.
The experiment was repeated twice more for each metal.
Metal | Trial 1 time / s ± 1 s | Trial 2 time / s ± 1 s | Trial 3 time / s ± 1 s |
|---|---|---|---|
copper | 62 | 65 | 60 |
aluminium | 98 | 95 | 101 |
brass | 210 | 236 | 219 |
steel | 540 | 512 | 528 |
- (a)
Identify the independent and the dependent variable.
1 mark
- (b)
State two variables, other than the length and diameter of the rods, that should be controlled.
2 marks
- (c)
Calculate the mean time for brass and its uncertainty, taking the uncertainty as half the range.
2 marks
- (d)
Explain, in terms of bonding, how energy is transferred along a metal rod.
2 marks
- (e)
Suggest one source of random error in this method and a modification that would reduce it.
2 marks
Copper is the most widely used metal for electrical wiring in buildings.
- (a)
Describe the bonding in copper metal.
2 marks
- (b)
Explain why copper conducts electricity in the solid state.
2 marks
- (c)
Explain why copper can be drawn out into thin wires without breaking.
2 marks
- (d)
Gold is a slightly poorer electrical conductor than copper and is far more expensive, yet it is used to coat the contacts of electrical connectors. Suggest one reason for this.
1 mark
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More questions in Models of bonding and structure
- S2.1The ionic model
- S2.2The covalent model
- S2.3The metallic modelThis page
- S2.4From models to materials
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