Edexcel GCSE Combined Science Paper 3: Chemistry 1 Foundation June 2025 question paper 1SC0/1CF

A student investigates the reaction that occurs when zinc carbonate is heated.

Figure 1 shows the apparatus the student uses.

What is the name of the piece of apparatus labelled G in Figure 1?

State what apparatus should be used to heat the zinc carbonate in Figure 1.

The word equation for the reaction that occurs when zinc carbonate is heated is

zinc carbonate zinc oxide + carbon dioxide

The carbon dioxide bubbles through the limewater.

State what is seen when carbon dioxide bubbles through the limewater.

Another student investigates the change in mass that takes place when zinc carbonate is heated.

Figure 2 shows the results the student records at the start of the investigation.

Using the results in Figure 2, calculate the mass of zinc carbonate in the test tube.

mass of zinc carbonate =_........ g

The student then

• heats the test tube containing the zinc carbonate for five minutes

• places the hot test tube on a bench mat to cool

• finds the mass of the test tube and contents.

Describe what the student should do next to make sure that all the zinc carbonate has reacted completely.

Figure 3 shows the changes of state between ice, water and steam.

What is the name of the change of state labelled P in Figure 3?

Which of the following shows the arrangement of particles in ice?

Figure 4 shows the apparatus that can be used to separate a mixture of ethanol and water by fractional distillation.

Name the piece of apparatus labelled R in Figure 4.

Explain the purpose of the piece of apparatus labelled Q in Figure 4.

A student investigates the food dyes used to make the colours W, X, Y and Z in four different sweets.

Figure 5 shows the chromatogram produced.

The solvent front shows how far the solvent moves during the investigation.

Using the information in Figure 5, state which colour is made of only two food dyes.

The R_f value of a spot on the chromatogram can be calculated using the equation R = distance moved by the food dye ^f distance moved by solvent front

Using the information in Figure 5, calculate the R_f value of the food dye labelled S.

Give your answer to 2 decimal places.

R_f value of food dye S =_........

This question is about metals and their reactions with acids.

Place ticks () in boxes to show which elements in the table are metals.

Use the periodic table to help you answer this question.

Three equal sized pieces of the metals E, F, G and H are put into separate test tubes containing equal volumes of dilute sulfuric acid.

The results in Figure 6 show the test tubes after half a minute.

Arrange the metals E, F, G and H in order of reactivity.

The bubbles that form are hydrogen.

Which row of the table shows the test and result that confirm the gas is hydrogen?

When zinc reacts with very dilute nitric acid, zinc nitrate is formed.

The formula of zinc nitrate is Zn(NO₃)₂

Calculate the relative formula mass of zinc nitrate, Zn(NO₃)₂

(relative atomic masses: Zn = 65, N = 14, O = 16)

relative formula mass =_........

A student investigates the reaction between a metal and a dilute acid using the apparatus shown in Figure 7.

Cotton wool is placed in the top of the apparatus as shown, to stop any acid from spraying out.

The total mass of the apparatus is shown at the start of the reaction and after the reaction has ended.

start of reaction end of reaction

Figure 7

State two ways the student would know that the reaction has ended.

Figure 8 shows part of the reactivity series of metals.

The method used to extract a metal from its ore is related to the metal’s position in the reactivity series.

Which metal is found in the Earth’s crust as an uncombined element?

Name one metal in Figure 8 that is normally extracted by electrolysis.

25 000 kg of an ore of iron was found to contain 10 050 kg of iron.

Calculate the percentage of iron in this ore of iron.

percentage of iron in ore =_........

When copper oxide is heated with carbon, the products are copper and carbon dioxide.

Write the word equation for this reaction.

In this reaction, copper oxide loses oxygen.

State the type of reaction when copper oxide loses oxygen.

In one reaction, 159.0 g of copper oxide was heated with excess carbon to produce 127.0 g of copper.

Use this information to calculate the mass of copper formed, in g, when 238.5 g of copper oxide is reacted with excess carbon.

mass of copper =_........ g

State why this reaction with copper oxide uses excess carbon.

A solution of zinc sulfate was made by dissolving 23.8 g of the compound in water and was made up to a total volume of 250 cm³ with water.

Calculate the concentration of this solution in g dm^–3.

Give your answer to 2 significant figures.

concentration =_........ g dm^–3

Atoms of neon are made up of subatomic particles.

Figure 9 shows some information about the subatomic particles in neon atoms.

Complete Figure 9 with the missing information.

All atoms of neon have an atomic number of 10.

Describe what information about the number of subatomic particles can be obtained from the atomic number of neon.

Explain why atoms of neon are electrically neutral.

*(b) The structure of the periodic table and the position of the elements in the periodic table are linked to the electronic configuration of the elements.

Figure 10 shows the structure of the periodic table and the first 12 elements with their atomic numbers.

group

Use the first 12 elements shown in Figure 10 to explain

• how the structure of the periodic table is linked to the electronic configuration of the atoms of the elements

• how the arrangement of the elements is linked to their electronic configuration.

Silver nitrate and potassium chloride are ionic compounds that are soluble in water.

When potassium chloride solution is added to a solution of silver nitrate, a white precipitate forms.

Complete the equation for this reaction, including the missing state symbol.

Give the name of the white precipitate that forms.

State and explain how the white precipitate can be separated from the reaction mixture.

Silver nitrate solution conducts electricity. Solid silver also conducts electricity.

Describe how silver nitrate solution conducts electricity and how solid silver conducts electricity.

A bottle containing an unknown solution is labelled with the two hazard symbols shown in Figure 11.

What are the meanings of these two symbols?

State a safety step that should be taken when using the unknown solution.