AQA GCSE Trilogy Chemistry Paper 2 Foundation June 2019 question paper 8464/C/2F

This question is about gases.

Draw one line from each substance to the description of the substance.

What is used to test for each of the gases?

Draw one line from each gas to the test for the gas.

Give two reasons why the percentage of carbon dioxide in the air has decreased in the last 2.7 billion years.

Tick (✓) two boxes.

Oxygen reacts with sulfur dioxide.

The reaction is reversible.

What is the symbol for a reversible reaction?

Complete the sentence.

In a reversible reaction the forward reaction is exothermic, so the

A reversible reaction happens in apparatus which stops the escape of reactants and products.

Complete the sentence.

Equilibrium is reached when the forward and reverse reactions happen at

Concrete contains cement, water, sand and small stones.

Concrete is a mixture designed as a useful product.

What do we call a mixture which has been designed as a useful product?

Tick (✓) one box.

Concrete contains cement.

Cement is made by heating a mixture containing silicon dioxide (SiO₂).

Why does silicon dioxide have a very high melting point?

Tick (✓) two boxes.

Student A investigated how the mass of the small stones in concrete affects the strength of a concrete beam. All other variables were kept the same.

The student added weights until the concrete beam broke.

Figure 1 shows the apparatus Student A used.

Draw one line from each type of variable to the correct example of the variable.

Table 1 shows Student A ’s results.

Plot the data from Table 1 on Figure 2.

The first three points are plotted for you.

Draw the line of best fit.

What mass of small stones would be needed to make the strongest concrete?

Give a reason for your answer.

Use Figure 2.

Student B did a similar investigation.

Figure 3 shows Student B ’s results.

How could Student B improve their investigation?

Use Figure 2 and Figure 3.

A student investigated the rate of the reaction between magnesium and hydrochloric acid.

Figure 4 shows the apparatus the student used.

Balance the equation for the reaction.

The student used 50 cm³ of hydrochloric acid.

Which apparatus would measure 50 cm³ of hydrochloric acid with the greatest accuracy?

Tick (✓) one box.

The student measured the volume of gas produced every 20 seconds for 2 minutes.

The volume of gas was zero at the start of the experiment.

The measured volumes of gas were:

Complete Table 2 to show these results.

The volumes of gas were lower than expected.

Suggest one reason.

The student repeated the experiment using different concentrations of hydrochloric acid.

Give two variables the student should keep the same.

Complete the sentences.

As the concentration of the hydrochloric acid increased, the

Large hydrocarbon molecules can be cracked to produce smaller, more useful molecules.

Alkanes and alkenes are produced when hydrocarbons are cracked.

Give two conditions used for cracking.

Butane (C₄H₁₀) is an alkane.

Figure 5 shows part of the displayed structural formula of butane.

Complete the displayed structural formula of butane in Figure 5.

Butane burns in oxygen.

Complete the word equation for the complete combustion of butane.

Ethene is an alkene.

Give a test for alkenes.

Give the result of the test if an alkene is present.

Each year many tonnes of crude oil are extracted from the Earth.

It took millions of years for the crude oil to be formed.

What do we call development that meets the needs of current generations without compromising the resources for future generations?

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Figure 6 shows the percentage by mass of some metals in the Earth’s crust.

What is the percentage by mass of calcium in the Earth’s crust?

Tick (✓) one box.

The percentage by mass of magnesium in the Earth’s crust is 2.1%

Draw the bar for magnesium on Figure 6.

Copper sulfate is produced during the extraction of copper from the Earth’s crust.

Copper is produced from copper sulfate solution using iron.

The word equation for the reaction is:

copper sulfate + iron → iron sulfate + copper

From the equation a company calculated that 648 kg of copper sulfate are needed to produce 617 kg of iron sulfate and 258 kg of copper.

Calculate the mass of iron needed to make 258 kg of copper.

Copper is used as a catalyst.

Figure 7 shows the reaction profile for a reaction without a catalyst.

Draw an arrow on Figure 7 to show the activation energy.

The reaction profile for the reaction without a catalyst is shown again in Figure 8.

Draw a reaction profile on Figure 8 for the same reaction with a catalyst.

What are catalysts in biological systems called?

Tick (✓) one box.

Water that is safe to drink contains dissolved substances.

What do we call water that is safe to drink?

Tick (✓) one box.

Describe a test for pure water.

Give the result of the test if the water is pure.

Describe a method to determine the mass of dissolved solids in a 100 cm³ sample of river water.

A sample of river water contains 125 mg per dm³ of dissolved solids.

Calculate the mass of dissolved solids in grams in 250 cm³ of this sample of river water.

Give your answer to 2 significant figures.

A water company allows a maximum of 500 mg per dm³ of sulfate ions in drinking water.

A sample of drinking water contains 44 mg per dm³ of sulfate ions.

Calculate the percentage (%) of the maximum allowed mass of sulfate ions in the sample of drinking water.

This question is about atmospheric pollutants from fuels.

Fuel burns in a car engine.

Describe how oxides of nitrogen are produced in a car engine.

Table 3 shows the carbon footprint during the manufacture and use of three cars.

Evaluate the carbon footprint of the cars.

Use information from Table 3.