This quiz consists of 10 Amount of substance multiple choice questions for the AQA AS and A-Level Chemistry specification.

The questions are a similar style and level of difficulty to the multiple-choice questions you’ll be given in the AQA Chemistry exams.

Though they’re based on the AQA specification, they’re also appropriate for students studying other exam boards.

Some of these questions are straightforward, some of them are horrible. You need to know how to do all of them by the time the exams come around though, so if there’s anything you can’t do (even if it seems a bit weird) make sure you work backward from the answer and figure out why the answer is what it is.

Amount of substance multiple choice questions

If you’re using this as a test, allow yourself around 11-12 minutes to answer these questions. If you’re using them to learn from, feel free to use your textbook to help you.

As always with Chemistry, make sure you have your periodic table and your calculator handy.

1. How many molecules are in 15.0 g of PH_{3}?
(Avogadro’s number is 6.022 x 10^{23})

Correct!Wrong!

2. What is the molar mass of an oxygen atom?

Correct!Wrong!

3. The density of pure water is 1000 g dm^{-3}.
What is the molarity of pure water?

Correct!Wrong!

4. Calculate the mass of KOH that should be dissolved in 500 cm^{3} water to give a solution with a concentration of 0.600 mol dm^{-3}

Correct!Wrong!

5. A 1 dm^{3} sample of Noble gas X contains 0.04471 moles. The density of the gas is 1.784 g dm^{-3}. Which gas does the sample contain?

Correct!Wrong!

6. Calculate the concentration of the solution that is formed by adding 50 cm^{3} of water to 25 cm^{3} of 0.268 mol dm^{-3} HCl

Correct!Wrong!

7. 0.05 moles of an Iron salt FeCl_{x} reacts with AgNO_{3}to form 21.5 g of AgCl. What is the value of x?

Correct!Wrong!

8. A The uncertainty of a balance is + 0.1g. What is the % uncertainty if this balance is used to measure 26.7 g of CuSO_{4}?

Correct!Wrong!

9. What is the formula of Iron(II) Carbonate?

Correct!Wrong!

10. Dinitrogen Monoxide decomposes to produce Nitrogen and Oxygen according to the following equation:

2N_{2}O(g) → 2N^{2}(g) + O_{2}(g)

Assuming a constant temperature, how many times greater is the volume of the products than the volume of the reactants?

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