12987196
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Quiz von https:// revisechemistry.uk, aktualisiert more than 1 year ago
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Erstellt von https:// revisechemistry.uk
vor fast 7 Jahre
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Frage 1
Frage
Where are the transition metals found in the periodic table?
Antworten
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On the left of the periodic table, in groups 1 and 2
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In the middle of the periodic table, between groups 2 and 3
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On the right of the periodic table, in groups 7 and 8
Frage 2
Frage
What two things must be present for iron to rust?
Antworten
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oxygen
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water
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carbon dioxide
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ethanol
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calcium carbonate
Frage 3
Frage
Why are alloys typically stiffer than pure metals?
Antworten
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The metallic bonding is stronger in alloys
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The metal atoms are all very regularly arranged in an alloy
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The layers of metal atoms in the alloy cannot slide over each other very easily
Frage 4
Frage
A student had calculated the theoretical yield of a product was 8 g. The actual yield obtained was 6 g. What was the percentage yield?
[blank_start]75[blank_end]%
Antworten
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75
Frage 5
Frage
Which of the following could explain why the percentage yield in a chemical reaction was less than 100%?
Antworten
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The top pan balance was faulty
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The reaction forms more than one product
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Some of the product was lost during pouring liquids
Frage 6
Frage
The RFM of the desired product in a reaction is 95. The sum of the RFM values for the reactants is 113. What is the atom economy for this reaction?
[blank_start]84[blank_end]%
Antworten
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84
Frage 7
Frage
A solution has a volume of 650 cm3. What is the volume of this solution in dm3?
[blank_start]0.65[blank_end] dm3
Antworten
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0.65
Frage 8
Frage
A solution of NaOH has a concentration of 0.2 mol/dm3. Calculate its concentration in g/dm3. The RFM of NaOH is 40.
[blank_start]8[blank_end] g/dm3
Antworten
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8
Frage 9
Frage
A sample of methane gas has a volume of 120 cm3 at room temperature and pressure. The molar volume is 24 dm3. How many moles of methane are present in the sample?
[blank_start]5[blank_end] moles
Antworten
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5
Frage 10
Frage
What does NPK stand for in terms of fertilisers?
N - [blank_start]nitrogen[blank_end]
P - phosphorous
K - [blank_start]potassium[blank_end]
Antworten
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nitrogen
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potassium
Frage 11
Frage
Which of the following statements about dynamic equilibrium is true?
Antworten
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The reaction has finished
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The forwards and reverse reactions occur at the same rate
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The concentration of reactants is the same as the concentration of products
Frage 12
Frage
Which of these factors does not affect the choice of reaction pathway in an industrial chemical manufacturing process?
Antworten
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The yield of product formed
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The relative formula mass of the products
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The uses for any by-products formed
Frage 13
Frage
What is the only chemical product when hydrogen and oxygen are reacted together in a fuel cell?
[blank_start]water[blank_end]
Antworten
-
water
Frage 14
Frage
Rusting is a specific example of corrosion, and requires both [blank_start]air[blank_end] and water for iron to rust. There are three ways to prevent iron from rusting:
- exclusion of [blank_start]oxygen[blank_end] (by either using an atmosphere of [blank_start]nitrogen[blank_end] or argon)
- exclusion of [blank_start]water[blank_end] (by storing with a desiccant)
- sacrificial protection (when a more reactive [blank_start]metal[blank_end] than iron is attached to the object to prevent [blank_start]iron[blank_end] from rusting)
Antworten
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air
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oxygen
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nitrogen
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water
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metal
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iron
Frage 15
Frage
Fuel cells will produce a voltage continuously, provided they have a constant supply of fuel and oxygen (from the air).
Antworten
- True
- False
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