This Chemistry quiz is called 'Chemistry - Extracting Reactive Metals' and it has been written by teachers to help you if you are studying the subject at high school. Playing educational quizzes is a user-friendly way to learn if you are in the 9th or 10th grade - aged 14 to 16.
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In high school, Science students will look at some of the materials used in building, such as limestone or metals. This quiz looks in particular at extracting reactive metals.
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The rocks of the Earth's crust contain metals in the form of metal compounds like iron oxide and aluminum oxide. These are often mixed with other substances and where they occur in a high enough concentration, we call them ores. An ore is a rock from which a metal can be extracted economically.
Ores are mined from the ground on a large scale. They often need to be concentrated even more before the metal is extracted and purified. The economics of using a particular ore may change over time. For example, as a metal becomes rarer, an ore that only has a low concentration of the metal may be used when it was previously considered too expensive to mine.
Many ores are the oxides of a metal and when metal oxides are reduced (have their oxygen removed), the metal is left. How this is done depends on the reactivity of the metal. The extraction of reactive metals like aluminum is usually carried out by using electrolysis. That is relatively easy nowadays, there is plenty of electricity available and so aluminum is a commonly used metal.
But this wasn't always the case. Aluminum ore is extremely difficult to melt and before the 'easy' method of melting it had been discovered, the only way of producing aluminum was to displace it from its compounds using an even more reactive metal. So only very rich people could afford things made from aluminum - in fact one of the ways that they showed off their wealth in the middle of the nineteenth century was to provide dinner guests with flatware made from aluminum instead of silver!
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1.
|
What is an ore? |
|
[ ] |
Something you use for rowing a boat |
[ ] |
A rock made from metal |
[ ] |
A substance from the ground from which a metal can be economically extracted |
[ ] |
Aluminum oxide |
|
|
2.
|
What is the usual method of extracting a reactive metal from its purified ore? |
|
[ ] |
Electrolysis of the molten ore |
[ ] |
Displacement by carbon |
[ ] |
Pyrolysis |
[ ] |
Filtration |
|
|
3.
|
What is the correct order of these sentences which briefly describe the process used to extract a reactive metal like aluminum?
1. Electrodes are placed into the molten ore.
2. The ore is purified and melted.
3. The molten metal can be tapped off and cast into ingots.
4. The metal ions are deposited as molten aluminum. |
|
[ ] |
1, 2, 4, 3 |
[ ] |
2, 1, 4, 3 |
[ ] |
3, 2, 1, 4 |
[ ] |
4, 3, 1, 2 |
|
|
4.
|
Why do the ores of reactive metals need to be molten during the extraction process? |
|
[ ] |
So that they can be stirred |
[ ] |
So that the metal can be poured off the top |
[ ] |
So that more ore can easily be added when metal is removed |
[ ] |
So that the electricity can pass through the ore |
|
|
5.
|
During the electrolysis of a reactive metal ore, which electrode attracts the metal ions? |
|
[ ] |
The neutral electrode |
[ ] |
The cathode |
[ ] |
The anode |
[ ] |
It happens randomly |
|
|
6.
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Why can you not obtain group I and group II metals by heating their oxide with carbon? |
|
[ ] |
Carbon is more reactive than group I and group II metals |
[ ] |
The ores of group I and group II metals are too strong |
[ ] |
The metals are silver in color but carbon is black |
[ ] |
Carbon is less reactive than the group I and group II metals |
|
|
7.
|
Titanium is a stronger and lighter metal than iron. Apart from the fact that iron is more abundant in the Earth's crust, why do we not use it instead? |
|
[ ] |
It is more easily corroded because it is more reactive than iron |
[ ] |
It is only found in countries that like to keep their resources for themselves rather than exporting them |
[ ] |
It is not malleable or ductile |
[ ] |
Extracting it is an expensive and difficult process |
|
|
8.
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To extract titanium, the ore (titanium dioxide) is converted to titanium chloride which is then reacted with magnesium at 800oC. The magnesium combines with the chloride, leaving the titanium metal on its own. The reaction of magnesium with the titanium chloride is an example of what sort of reaction? |
|
[ ] |
Neutralisation |
[ ] |
Displacement |
[ ] |
Hydration |
[ ] |
Condensation |
|
|
9.
|
What does the displacement reaction of magnesium with the titanium chloride tell you about titanium and magnesium? |
|
[ ] |
They are non-metals |
[ ] |
Titanium is softer than magnesium |
[ ] |
Titanium is more reactive than magnesium |
[ ] |
Titanium is less reactive than magnesium |
|
|
10.
|
Which of the following metals could also be used to displace titanium from its chloride? |
|
[ ] |
Gold |
[ ] |
Iron |
[ ] |
Aluminium |
[ ] |
Sodium |
|
|
1.
|
What is an ore? |
|
[ ] |
Something you use for rowing a boat |
[ ] |
A rock made from metal |
[x] |
A substance from the ground from which a metal can be economically extracted |
[ ] |
Aluminum oxide |
|
|
2.
|
What is the usual method of extracting a reactive metal from its purified ore? |
|
[x] |
Electrolysis of the molten ore |
[ ] |
Displacement by carbon |
[ ] |
Pyrolysis |
[ ] |
Filtration |
|
|
3.
|
What is the correct order of these sentences which briefly describe the process used to extract a reactive metal like aluminum?
1. Electrodes are placed into the molten ore.
2. The ore is purified and melted.
3. The molten metal can be tapped off and cast into ingots.
4. The metal ions are deposited as molten aluminum. |
|
[ ] |
1, 2, 4, 3 |
[x] |
2, 1, 4, 3 |
[ ] |
3, 2, 1, 4 |
[ ] |
4, 3, 1, 2 |
|
|
4.
|
Why do the ores of reactive metals need to be molten during the extraction process? |
|
[ ] |
So that they can be stirred |
[ ] |
So that the metal can be poured off the top |
[ ] |
So that more ore can easily be added when metal is removed |
[x] |
So that the electricity can pass through the ore |
|
|
5.
|
During the electrolysis of a reactive metal ore, which electrode attracts the metal ions? |
|
[ ] |
The neutral electrode |
[x] |
The cathode |
[ ] |
The anode |
[ ] |
It happens randomly |
|
|
6.
|
Why can you not obtain group I and group II metals by heating their oxide with carbon? |
|
[ ] |
Carbon is more reactive than group I and group II metals |
[ ] |
The ores of group I and group II metals are too strong |
[ ] |
The metals are silver in color but carbon is black |
[x] |
Carbon is less reactive than the group I and group II metals |
|
|
7.
|
Titanium is a stronger and lighter metal than iron. Apart from the fact that iron is more abundant in the Earth's crust, why do we not use it instead? |
|
[ ] |
It is more easily corroded because it is more reactive than iron |
[ ] |
It is only found in countries that like to keep their resources for themselves rather than exporting them |
[ ] |
It is not malleable or ductile |
[x] |
Extracting it is an expensive and difficult process |
|
|
8.
|
To extract titanium, the ore (titanium dioxide) is converted to titanium chloride which is then reacted with magnesium at 800oC. The magnesium combines with the chloride, leaving the titanium metal on its own. The reaction of magnesium with the titanium chloride is an example of what sort of reaction? |
|
[ ] |
Neutralisation |
[x] |
Displacement |
[ ] |
Hydration |
[ ] |
Condensation |
|
|
9.
|
What does the displacement reaction of magnesium with the titanium chloride tell you about titanium and magnesium? |
|
[ ] |
They are non-metals |
[ ] |
Titanium is softer than magnesium |
[ ] |
Titanium is more reactive than magnesium |
[x] |
Titanium is less reactive than magnesium |
|
|
10.
|
Which of the following metals could also be used to displace titanium from its chloride? |
|
[ ] |
Gold |
[ ] |
Iron |
[ ] |
Aluminium |
[x] |
Sodium |
|
|