AQA GCSE Trilogy Chemistry Paper 1 Foundation June 2019 question paper 8464/C/1F

This question is about energy changes.

Which of these items uses an endothermic reaction? Tick (✓) one box.

Figure 1 shows the reaction profile for an exothermic reaction.

Which letter represents the activation energy for the reaction? Tick (✓) one box.

Which letter represents the overall energy change for the reaction? Tick (✓) one box.

Complete the sentence. Choose the answer from the box.

In an exothermic reaction the energy of the products is the energy of the reactants.

A student measured the temperature at the start and at the end of a reaction. Name the apparatus used to measure the temperature.

Figure 2 shows the temperature at the end of the reaction.

Complete Table 1. Use Figure 2.

This question is about salts and electrolysis. A student wants to make copper chloride crystals. The student adds excess copper oxide to some hot acid. The student stirs the mixture.

Which acid should the student use? Tick (✓) one box.

Suggest how the student would know that excess copper oxide has been added.

There are four more stages, A, B, C and D, to make copper chloride crystals. The stages A, B, C and D are not in the correct order. Stage A Partially evaporate by heating with a water bath Stage B Filter the mixture into an evaporating basin Stage C Leave to crystallise Stage D Remove and dry the crystals

Put stages A, B, C and D in the correct order.

Molten copper chloride can be electrolysed. State the product at each electrode when molten copper chloride is electrolysed.

Negative electrode Positive electrode

A solution of copper chloride is electrolysed. Figure 3 shows a graph of the increase in mass of the negative electrode. This increase is shown over a time of 10 minutes.

Calculate the gradient of the line in Figure 3. Use the equation:

Aluminium is produced by electrolysis of a molten mixture. Complete the sentence. Choose the answers from the box.

This question is about the periodic table and argon.

What order did scientists use to arrange elements in early periodic tables? Tick (✓) one box.

In early periodic tables some elements were placed in the wrong groups. Mendeleev overcame some of these problems in his periodic table. Complete the sentence.

been discovered.

What is the name of the group that contains argon? Tick (✓) one box.

An atom of argon is represented as 40Ar 18 Determine the number of protons and the number of neutrons in one atom of argon.

39 38 Different atoms of argon are, Ar and Ar 18 18 What is the name given to these different atoms of argon?

Tick (✓) one box.

40 What is the electronic structure of an argon atom, Ar ? 18 Tick (✓) one box.

Why is argon unreactive?

This question is about Group 1 elements.

Sodium reacts with chlorine to produce sodium chloride. Balance the equation for the reaction.

4.6 g of sodium reacts with chlorine to produce 11.7 g of sodium chloride. What mass of chlorine reacted?

A teacher puts hot sodium into a gas jar of chlorine. The changes seen before, during and after this reaction were observed. Complete the sentences. Choose the answers from the box.

Sodium chloride (NaC l) is an ionic compound. Write the formulae of the ions in sodium chloride.

Complete the sentence. Choose the answer from the box.

Potassium is more reactive than sodium.

How does the size of a potassium atom compare with the size of a sodium atom? Give a reason for your answer.

This question is about oxygen and compounds of oxygen.

What is the state symbol of oxygen at room temperature?

Figure 4 shows the percentage by mass of the elements calcium, carbon and oxygen in calcium carbonate.

What is the percentage by mass of calcium in calcium carbonate?

At high temperature, sodium nitrate decomposes into sodium nitrite and oxygen. A student heats three samples of sodium nitrate. The mass of each sample was 4.50 g The mass of solid after heating was recorded. Table 2 shows the mass of solid after heating in each experiment.

Calculate the mean mass of solid after heating. Give your answer to 3 significant figures.

Table 3 shows the electronic structure of hydrogen and oxygen.

Figure 5 shows part of a dot and cross diagram of a molecule of water (H₂O). Complete the dot and cross diagram. You should show only the electrons in the outer energy levels.

Oxygen and sulfur are examples of simple molecules.

Complete the sentence. Choose the answer from the box.

Figure 6 shows the relative sizes of an oxygen molecule and a sulfur molecule.

How does the boiling point of sulfur compare with the boiling point of oxygen? Complete the sentences.

than the intermolecular forces in oxygen.

This question is about reactions of metals. Figure 7 shows what happens when calcium, copper, magnesium and zinc are added to hydrochloric acid.

What is the order of decreasing reactivity of these four metals? Tick (✓) one box.

A student wants to make a fair comparison of the reactivity of the metals with hydrochloric acid.

Name two variables that must be kept constant.

What is the independent variable in this reaction?

Predict the reactivity of beryllium compared with magnesium. Give a reason for your answer. Use the periodic table.

A solution of hydrochloric acid contains 3.2 g of hydrogen chloride in 50 cm³ Calculate the concentration of hydrogen chloride in g per dm³

This question is about salts. Ammonium nitrate solution is produced when ammonia gas reacts with nitric acid.

Give the state symbol for ammonium nitrate solution.

What is the formula of nitric acid? Tick (✓) one box.

Ammonia gas dissolves in water to produce ammonia solution. Ammonia solution contains hydroxide ions, OH^– A student adds universal indicator to solutions of nitric acid and ammonia. What colour is observed in each solution?

Colour in nitric acid Colour in ammonia solution

The student gradually added nitric acid to ammonia solution. Which row, A, B, C or D, shows the change in pH as the nitric acid is

Calculate the percentage by mass of oxygen in ammonium nitrate (NH₄NO₃). Relative atomic masses (A_r): H = 1 N = 14 O = 16 Relative formula mass (M_r): NH₄NO₃ = 80

Describe a method to investigate how the temperature changes when different masses of ammonium nitrate are dissolved in water. You do not need to write about safety precautions.