17749279
Description
Quiz by https:// revisechemistry.uk, updated more than 1 year ago
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Question 1
Question
Which of the following statements about fuel cells is false?
Answer
-
Water is the only product
-
They will operate continuously
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They produce electricity
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They convert electricity into heat
Question 2
Question
Which of the following are advantages of fuel cells?
Answer
-
Direct energy transfer
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Less pollutants
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No recharge limit
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Hydrogen is a gas
-
Hydrogen is explosive
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Hydrogen is produced from fossil fuels, or electrolysis
Question 3
Question
The overall reaction in a hydrogen fuel cell involves the oxidation of hydrogen to produce water.
Answer
- True
- False
Question 4
Question
Simple chemical cells work because the metals used have different reactivities.
Answer
- True
- False
Question 5
Question
If a reaction should produce 50 g of product, but only produces 42 g, calculate the percentage yield (2 s.f.): [blank_start]84[blank_end]%
Answer
-
84
Question 6
Question
What is the atom economy for this reaction, where hydrogen is the desired product (give your answer to 2 s.f.)? [blank_start]2.0[blank_end]%
Answer
-
2.0
Question 7
Question
The pathway chosen for a product depends on factors such as (select all that apply):
Answer
-
percentage yield
-
atom economy
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rate of reaction
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equilibrium position
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usefulness of by-products
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ability to transport products
Question 8
Question
When completing a titration, you will have multiple readings which you need to calculate an average reading for.
It is important that the titres you include in your calculation are [blank_start]concordant[blank_end].
Answer
-
concordant
Question 9
Question
Which of the following is not a worry of nanoparticles?
Answer
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people are concerned the small size of nanoparticles makes it possible to breathe them in, or to pass into cells
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inside the body, they might catalyse reactions that are harmful producing toxic substances
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modern nanoparticulate materials have not been used for long, so it is difficult for scientists to determine their risks
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individual particles (nanoparticulate) of titanium dioxide have no colour and cannot be seen when it is spread on skin
Question 10
Question
Compared to other metals, most transition metals have the general properties of:
Answer
-
higher melting points
-
lower densities
-
greater strength
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lower hardness
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form coloured compounds
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have catalytic activity
Question 11
Question
The group 1 elements react quickly with oxygen in the air at room temperature. Most transition elements react slowly, or not at all, with oxygen at room temperature.
Answer
- True
- False
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