AQA GCSE Chemistry Unit 2.3

Matthew T
Quiz by , created over 5 years ago

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

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Matthew T
Created by Matthew T over 5 years ago
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Question 1

Question
What is the mass number of an element?
Answer
  • Number of protons
  • Number of protons and neutrons
  • Number of protons, neutrons and electrons

Question 2

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

Question 3

Question
Which isotope of hydrogen has 1 neutron?
Answer
  • Protium
  • Deuterium
  • Tritium

Question 4

Question
What is the relative formula mass of a compound?
Answer
  • 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

Question 5

Question
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.
Answer
  • True
  • False

Question 6

Question
What percentage of magnesium oxide is magnesium? (RAM of Mg = 24, RAM of O = 16, magnesium oxide = MgO)
Answer
  • 50%
  • 55%
  • 60%
  • 65%

Question 7

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

Question 8

Question
What is the empirical formula of the hydrocarbon containing 75% carbon? (RAM of C = 12, RAM of H = 1)
Answer
  • C2H3
  • CH2
  • CH3
  • CH4

Question 9

Question
What can we learn from the balanced symbol equation?
Answer
  • 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

Question 10

Question
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)
Answer
  • 17.75g
  • 36.5g
  • 73g

Question 11

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

Question 12

Question
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)
Answer
  • 50%
  • 60%
  • 70%
  • 80%

Question 13

Question
Why is the percentage yield of a reaction rarely 100%?
Answer
  • The reaction may be reversible
  • Some of the product may not be collected
  • The reaction may be incomplete
  • The product may have been hidden

Question 14

Question
What is a reversible reaction?
Answer
  • 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

Question 15

Question
Assuming that the reaction is reversible, what is the scientific notation for the reaction between ammonia and hydrogen chloride to form ammonium chloride?
Answer
  • NH3 + HCl --> NH4Cl
  • NH3 + HCl <--> NH4Cl
  • NH3 + HCl --> NH4Cl --> NH3 + HCl

Question 16

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

Question 17

Question
Which of these analytical methods does not rely on machinery?
Answer
  • Mass spectrometry
  • Gas chromatography
  • Paper chromatography

Question 18

Question
Which of these are advantages of using instrumental methods of analysis?
Answer
  • 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

Question 19

Question
What is measured to identify compounds in GC-MS?
Answer
  • Molecular ion peak
  • Retention time

Question 20

Question
What separates out compounds in a mixture in GC-MS?
Answer
  • Molecular ion peak
  • Retention time