0620_m24_qp_42
A paper of Chemistry, 0620
Questions:
5
Year:
2024
Paper:
4
Variant:
2
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1
Iron ore contains iron(oxide, Fe2O3. A blast furnace is used to extract iron from Fe2O3. Equations for some of the reactions in the blast furnace are shown. equation 1 C + O2 → CO2 equation 2 CaCO3 → CaO + CO2 equation 3 CaO + SiO2 → CaSiO3 Equation 1 shows the combustion of carbon in the blast furnace. Name the substance which provides the carbon for this reaction. State the purpose of the combustion of carbon in the blast furnace. Iron(oxide, Fe2O3, in iron ore is converted to iron when it reacts with carbon monoxide, CO, in the blast furnace. Calculate the percentage by mass of iron in iron(oxide, Fe2O3.  percentage = % State the name of the iron ore which consists mainly of iron(oxide. Describe how carbon monoxide is formed in the blast furnace. Write the symbol equation to show the reaction that occurs when iron(oxide is converted to iron in the blast furnace. Name the chemical process which happens to iron when iron(oxide is converted to iron in the blast furnace. State the type of reaction shown by equation 2. Explain why the reaction in equation 3 can be described as an acid–base reaction. State: ● the chemical name of SiO2 ● the common name given to CaSiO3 when it is formed in the blast furnace.  Aluminium cannot be extracted from its ore using a blast furnace. State why aluminium is not extracted from its ore using a blast furnace. Name the process used to extract aluminium from its ore. Both iron(oxide and aluminium oxide contain metal ions with a 3+ charge. Write the electronic configuration of an Al 3+ ion. Deduce the number of protons and electrons in an Fe3+ ion. protons electrons  
9. Metals  →  9.6. Extraction of metals
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2
The elements in Group VII of the Periodic Table are known as the halogens. Halogens can form halide ions. Identify the halogen with the lowest density at r.t.p. (room temperature and pressure). State the appearance of bromine at r.t.p. Use the Periodic Table to: ● give the symbol of the halogen with the highest atomic number ● deduce the number of occupied electron shells in an atom of this element.  Bromine molecules have covalent bonding. State what is meant by the term covalent bond. Name one halide ion which bromine molecules can displace. Explain why bromine can displace the halide ion in . Name a halide compound which can be used to detect the presence of water. Calcium chloride is an ionic compound. Complete the dot-and-cross diagram in for the ions in calcium chloride. Give the charges on each of the ions. Cl Cl Ca  Aqueous lead(ions are added to aqueous chloride ions. A white precipitate of insoluble lead(chloride, PbCl 2, is formed. Name a lead(compound which can be used in this reaction. Write the ionic equation for this reaction. Include state symbols. Name one other insoluble chloride. 
8. The Periodic Table  →  8.3. Group VII properties
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3
This question is about acids, bases and alkalis. Table 3.1 shows the pH values of some substances. Table 3.1 substance pH NaOH14 Ca(OH)210 H2O7 CH3COOH4 HNO31 Define the term base. State what is meant by the term alkali. Thymolphthalein is an indicator. State the colour of thymolphthalein in: ● NaOH● CH3COOH.  Use the information in Table 3.1 to identify the substance with the highest concentration of H+ions. Explain your answer. substance explanation  Name an indicator which can be used to identify the substance with the highest concentration of H+ions. Complete the equation to show the dissociation of ethanoic acid, CH3COOH, in aqueous solution. CH3COOHWrite the ionic equation which represents a neutralisation reaction between any acid and any alkali. Dilute nitric acid, HNO3, reacts with aqueous calcium hydroxide, Ca(OH)2, as shown. 2HNO3+ Ca(OH)2→ Ca(NO3)2+ 2H2O20.0 cm3 of 0.0150 mol / dm3 Ca(OH)2reacts with 25.0 cm3 of HNO3. Calculate the concentration of HNO3in g / dm3. Use the following steps. ● Calculate the number of moles of Ca(OH)2used.  mol ● Determine the number of moles of HNO3which react with the Ca(OH)2.  mol ● Calculate the concentration of HNO3in mol / dm3.  mol / dm3 ● Calculate the concentration of HNO3in g / dm3.  g / dm3  
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases
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4
The equation for the reaction between methanoic acid and ethanol in the presence of a catalyst can be represented as shown. HCOOH + CH3CH2OH X + H2O ∆H = –29.5 kJ / mol X represents the ester formed. In the equation, methanoic acid is represented by the formula HCOOH. Name this type of formula. Write the empirical formula of methanoic acid. Name and draw the displayed formula of ester X. name displayed formula  The reaction is reversible and reaches an equilibrium within a closed system. State what is meant by the term closed system. State two characteristics of an equilibrium.  Complete Table 4.1 to show the effect, if any, on the concentration of X at equilibrium for each change of condition. Table 4.1 change of condition effect on the concentration of X at equilibrium temperature is decreased concentration of HCOOH is decreased concentrations of both HCOOH and CH3CH2OH are decreased the catalyst is removed  
6. Chemical reactions  →  6.2. Rate of reaction
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
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5
Butane and but-1-ene are colourless gases at room temperature and pressure. Suggest why but-1-ene diffuses quicker than butane. Identify the products formed when butane undergoes complete combustion. One molecule of butane reacts with one molecule of chlorine in the presence of ultraviolet light. During the reaction, one hydrogen atom in butane is replaced by one chlorine atom. Name the type of reaction which needs ultraviolet light. State the purpose of ultraviolet light during this reaction. Name the type of reaction which takes place when one atom of chlorine replaces one atom of hydrogen. Determine how many different structural isomers can form during this reaction. When but-1-ene reacts with steam, two possible products form. Identify the type of catalyst which is used in this reaction. Name and draw the displayed formulae of the two possible products. product 1 product 2 name name displayed formula displayed formula  But-1-ene undergoes polymerisation. State the type of polymerisation but-1-ene undergoes. Draw part of the polymer molecule to show three repeat units.  
11. Organic chemistry  →  11.4. Alkanes
11. Organic chemistry  →  11.5. Alkenes
6. Chemical reactions  →  6.2. Rate of reaction
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