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Twenty questions on the third section of Unit 2 in AQA GCSE Chemistry: How much?

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AQA GCSE Chemistry Unit 2.3

AQA GCSE Chemistry Unit 2.3

Question 1 of 20

1

What is the mass number of an element?

Select one of the following:

  • Number of protons

  • Number of protons and neutrons

  • Number of protons, neutrons and electrons

Explanation

Question 2 of 20

1

True or false? Isotopes of the same element have the same physical properties but different chemical properties.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 20

1

Which isotope of hydrogen has 1 neutron?

Select one of the following:

  • Protium

  • Deuterium

  • Tritium

Explanation

Question 4 of 20

1

What is the relative formula mass of a compound?

Select one of the following:

  • The sum of the atomic masses of each element relative to C-12

  • The mass of the compound which it has decayed from

  • The mass of the compound in micrograms

Explanation

Question 5 of 20

1

True or false? A mole of a substance is the amount that contains Avogadro's constant number of particles - this can be simplified to the relative formula mass in grams.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 20

1

What percentage of magnesium oxide is magnesium? (RAM of Mg = 24, RAM of O = 16, magnesium oxide = MgO)

Select one of the following:

  • 50%

  • 55%

  • 60%

  • 65%

Explanation

Question 7 of 20

1

True or false? The empirical formula of a substance is the simplest ratio of the elements within it.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 20

1

What is the empirical formula of the hydrocarbon containing 75% carbon? (RAM of C = 12, RAM of H = 1)

Select one of the following:

  • C2H3

  • CH2

  • CH3

  • CH4

Explanation

Question 9 of 20

1

What can we learn from the balanced symbol equation?

Select one or more of the following:

  • Number of molecules involved in each side of the reaction

  • Number of moles involved in each side of the reaction

  • The rate of the reaction

  • How much energy is required to carry out the reaction

Explanation

Question 10 of 20

1

Given that H2 + Cl2 --> 2HCl, what mass of HCl would you expect to produce with 17.75g of Cl2? (RAM of H = 1, RAM of Cl = 35.5)

Select one of the following:

  • 17.75g

  • 36.5g

  • 73g

Explanation

Question 11 of 20

1

True or false? The formula to work out percentage yield is theoretical yield/actual yield * 100.

Select one of the following:

  • True
  • False

Explanation

Question 12 of 20

1

Given that CaCO3 --> CaO + CO2, what is the percentage yield of CaO if 100g of CaCO3 were used and 39g of CaO were collected? (RAM of Ca = 40, RAM of C = 12, RAM of O = 16)

Select one of the following:

  • 50%

  • 60%

  • 70%

  • 80%

Explanation

Question 13 of 20

1

Why is the percentage yield of a reaction rarely 100%?

Select one or more of the following:

  • The reaction may be reversible

  • Some of the product may not be collected

  • The reaction may be incomplete

  • The product may have been hidden

Explanation

Question 14 of 20

1

What is a reversible reaction?

Select one of the following:

  • One in which the reaction is always incomplete

  • One in which the products may react to produce reactants

  • One in which the products disintegrate upon production

Explanation

Question 15 of 20

1

Assuming that the reaction is reversible, what is the scientific notation for the reaction between ammonia and hydrogen chloride to form ammonium chloride?

Select one of the following:

  • NH3 + HCl --> NH4Cl

  • NH3 + HCl <--> NH4Cl

  • NH3 + HCl --> NH4Cl --> NH3 + HCl

Explanation

Question 16 of 20

1

True or false? One key application of chemical analysis is detection of illegal food additives such as tartrazine.

Select one of the following:

  • True
  • False

Explanation

Question 17 of 20

1

Which of these analytical methods does not rely on machinery?

Select one of the following:

  • Mass spectrometry

  • Gas chromatography

  • Paper chromatography

Explanation

Question 18 of 20

1

Which of these are advantages of using instrumental methods of analysis?

Select one or more of the following:

  • More expensive

  • Very accurate and sensitive

  • Quicker

  • Requires training to use

  • Can be used with small samples

  • Is only useful with known data to compare it to

Explanation

Question 19 of 20

1

What is measured to identify compounds in GC-MS?

Select one of the following:

  • Molecular ion peak

  • Retention time

Explanation

Question 20 of 20

1

What separates out compounds in a mixture in GC-MS?

Select one of the following:

  • Molecular ion peak

  • Retention time

Explanation

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