0620_s20_qp_31
A paper of Chemistry, 0620
Questions:
8
Year:
2020
Paper:
3
Variant:
1
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1
A list of symbols and formulae is shown. Al 3+ CH4 CO2 Fe3+ N2 NO2 O2 O2– Zn2+ Answer the following questions about these symbols and formulae. Each symbol or formula may be used once, more than once or not at all. Which symbol or formula represents: a compound which contributes to acid rain a compound which is a product of respiration a gas which forms 21% of clean dry air an ion which forms a red-brown precipitate when added to aqueous sodiumhydroxide an ion formed when an atom gains electrons? Complete the table to show the relative charge and approximate relative mass of a proton, a neutron and an electron. type of particle relative charge approximate relative mass proton +1 neutron electron  Deduce the number of electrons and neutrons in an atom of the isotope of iron shown. 58Fe number of electrons number of neutrons  
2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table
3. Stoichiometry  →  3.1. Formulae
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2
A solution is obtained by filtering a mixture of soil and water. The table shows the mass of some of the ions in 1000 cm3 of this solution. name of ion formula of ion mass of ion in 1000 cm3 of soil solution / mg aluminium Al 3+ 0.1 NH4 + 35.0 calcium Ca2+ 1.3 iron(Fe2+ 47.0 magnesium Mg2+ 0.2 NO3 – 23.0 phosphate PO4 3– 4.2 potassium K+ 99.0 sulfate SO4 2– 7.5 Answer these questions using the information in the table. Which negative ion has the lowest concentration? State the name of the NO3 – ion. Calculate the mass of phosphate ions in 250 cm3 of this solution.  mass = mg Name the compound that contains NH4 + ions and PO4 3– ions. Describe a test for potassium ions. test observations  The names and formulae for some compounds are shown. aluminium phosphate, Al PO4 calcium phosphate, Ca3(PO4)2 potassium phosphate, K3PO4 Deduce the formula for magnesium phosphate. 
9. Metals  →  9.4. Reactivity series
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
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3
Many compounds and elements have important uses. Complete the table to show the name, formula and use of each compound and element. name of compound or element number of atoms in the formula formula use chlorine chlorine = 2 Cl 2 carbon = 1 hydrogen = 4 CH4 calcium carbonate calcium = 1 carbon = 1 oxygen = 3  The table shows the minimum temperature for the reduction of four metal oxides by carbon. metal oxide minimum temperature for reduction by carbon calcium oxide not reduced at 1530 °C iron(oxide reduced at 650 °C titanium oxide reduced at 1530 °C zinc oxide reduced at 720 °C Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Anhydrous copper(sulfate, CuSO4, is used to test for water. Describe the change in colour when water is added to anhydrouscopper(sulfate. from to  This reaction is reversible. Describe how this reaction can be reversed. State one use of water in industry. 
9. Metals  →  9.4. Reactivity series
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
10. Chemistry of the environment  →  10.1. Water
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4
The properties of five alkenes at room temperature are shown in the table. alkene number of carbon atoms in a molecule state at room temperature density in g / cm3 boiling point / °C ethene gas 0.0012 –104 propene gas 0.0018 –47 butene gas 0.0024 pentene liquid 0.64 hexene liquid 0.67 Answer these questions using only the information in the table. Predict the boiling point of butene.  °C Describe the general trend in the density of the alkenes. Suggest why the densities of the first three alkenes are much lower than the density of pentene and hexene. Complete the chemical equation for the complete combustion of propene. 2C3H6 + O2 → 6CO2 + 6H2O Describe a test for carbondioxide. test observations  Universal indicator is added to an aqueous solution of carbondioxide. ● ● What colour change is observed? from green to ● ● Give a reason for your answer.  When propene undergoes incomplete combustion, carbonmonoxide is formed. What condition is needed for incomplete combustion? Give one adverse effect of carbonmonoxide on health. 
11. Organic chemistry  →  11.5. Alkenes
11. Organic chemistry  →  11.4. Alkanes
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5
When concentrated hydrochloricacid is electrolysed, gases are produced at the electrodes. The incomplete apparatus is shown. concentrated hydrochloric acid power supply + – Complete the diagram by: ● ● labelling the anode and cathode ● ● showing how the gases are collected.  Predict the products of this electrolysis at the: positive electrode negative electrode.  Graphite electrodes are used in this electrolysis. Suggest one other element that can be used as an electrode and give a reason, other than that it can conduct electricity. element reason  Hydrogenchloride is produced when chlorine reacts with hydrogen. Complete the chemical equation for this reaction. Cl 2 + → HCl Aqueous chlorine reacts with aqueous sodiumiodide. Cl 2 + 2NaI → I2 + 2NaCl How does this reaction show that chlorine is more reactive than iodine? What colour is iodine in aqueous solution? 
4. Electrochemistry  →  4.1. Electrolysis
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6
Acids have characteristic properties. Hydrochloricacid reacts with magnesium. Name the products of this reaction and give the observations. The rate of reaction of iron(carbonate with hydrochloricacid can be determined by measuring the time taken to produce 20 cm3 of carbondioxide. A student measured the time taken to produce 20 cm3 of carbon dioxide at three different temperatures. In each experiment the student used: ● ● 1 g of large pieces of iron(carbonate ● ● dilute hydrochloric acid of the same concentration and volume. The results are shown in the table. temperature / °C time / s Use the information in the table to describe how the rate of reaction changes with temperature. Describe the effect of each of the following on the rate of this reaction at constant temperature. ● ● Smaller pieces of iron(carbonate are used. All other conditions stay the same. ● ● The concentration of hydrochloricacid is decreased. All other conditions stay the same.  The reaction of iron(carbonate with hydrochloricacid is exothermic. What is meant by the term exothermic? Rust contains compounds of iron. State two conditions needed for iron to rust. Iron and magnesium are both used in alloys. Which one of these diagrams, A, B, C or D, best represents an alloy? A B C D 
6. Chemical reactions  →  6.2. Rate of reaction
9. Metals  →  9.4. Reactivity series
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7
The structure of myrcene is shown. C C H H H H H C C H H H H H C C C C C H H C H H H H Deduce the formula of myrcene to show the number of atoms of carbon and hydrogen. Myrcene is found in some plants. The coloured compounds in plant leaves can be separated by chromatography. Complete the diagram by putting the correct labels in the boxes. beaker lid  Myrcene is an unsaturated hydrocarbon. Describe a chemical test to distinguish between a saturated and an unsaturated hydrocarbon. test observations with saturated hydrocarbon observations with unsaturated hydrocarbon  Butane is a saturated hydrocarbon. To which homologous series does butane belong? Draw a circle around the correct answer. alcohol alkane alkene carboxylic acid Large hydrocarbons can be cracked to form smaller hydrocarbons. Complete the chemical equation for cracking tridecane, C13H28, to form an alkene and one other hydrocarbon. C13H28 → C3H6 +  Ethene is an alkene. Draw the structure of ethene showing all of the atoms and all of the bonds.  Complete the sentences about the separation of hydrocarbons from petroleum using words from the list. bitumen combustion condense crystallisation distillation evaporate gasoline kerosene melt Hydrocarbons are separated in a fractionating column by fractional . Hydrocarbons with lower boiling points move further up the column. When the temperature in the column falls below the boiling points of the hydrocarbons they . The fraction at the bottom of the column which is used for making roads is called .  
11. Organic chemistry  →  11.5. Alkenes
11. Organic chemistry  →  11.3. Fuels
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8
The diagram shows part of the structures of sodiumbromide and sulfur. Na+ Br – Na+ Br – Br – Na+ Br – Na+ Na+ Br – Na+ Br – Br – Na+ Br – Na+ sodium bromide sulfur Describe both sodiumbromide and sulfur in terms of: ● ● bonding ● ● electrical conductivity ● ● solubility in water.  Sulfur is an element. What is meant by the term element ? Sodium can be extracted from sodiumbromide by electrolysis. Sodium is a metal in GroupI of the PeriodicTable. Describe one chemical property of sodium. Which two of these statements about the physical properties of sodium are correct? Tick two boxes. Sodium is very hard. Sodium has a high density. Sodium conducts electricity. Sodium is malleable. Sodium does not conduct heat.  
2. Atoms, elements and compounds  →  2.4. Ions and ionic bonds
2. Atoms, elements and compounds  →  2.7. Metallic bonding
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