0620_w23_qp_31
A paper of Chemistry, 0620
Questions:
8
Year:
2023
Paper:
3
Variant:
1
Login to start this paper & get access to powerful tools
1
A list of substances is shown. ammonium nitrate carbon monoxide copper(chloride ethane ethene litmus methane methyl orange sodium chloride sodium sulfate sulfur dioxide thymolphthalein Answer the following questions using only the substances from the list. Each substance may be used once, more than once or not at all. Give the name of the substance that: turns from blue to colourless when an acid is added is in many fertilisers is a salt which has a negative ion with a charge of 2– is a waste gas from digestion in animals is a hydrocarbon with a total of five atoms in a molecule is a compound of a transition element. 
7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases
6. Chemical reactions  →  6.4. Redox
Open
2
Fig.2.1 shows the distillation apparatus that can be used to separate water from aqueous copper(sulfate. thermometer distillation flask aqueous copper(sulfate condenser water heat Explain how distillation separates water from aqueous copper(sulfate. Fig. 2.2 shows a fractionating column for separating petroleum into different hydrocarbon fractions. lubricating oil bitumen refinery gas fraction gasoline naphtha A diesel oil fuel oil On Fig.2.2, draw an X inside the column to show where the hydrocarbon with the highest viscosity collects. Name the fraction labelled A in Fig.2.2. State the name of the fraction in Fig.2.2 which has the lowest boiling point. State one use of the bitumen fraction. 
11. Organic chemistry  →  11.3. Fuels
Open
3
Table3.1 shows the average concentrations, in ng / 1000 cm3, of air pollutants in four different years. Table 3.1 year concentration of air pollutant in ng / 1000 cm3 ammonia hydrocarbons oxides of nitrogen particulates sulfur dioxide 10.6 12.0 15.3 30.1 20.5 11.2 13.0 21.6 28.2 20.0 14.3 15.2 23.5 26.5 25.0 15.5 9.0 14.0 25.2 18.2 Name the pollutant that has the lowest concentration in 2019. Name the pollutant that shows a continuous decrease in concentration from 2019 to 2022. Calculate the average mass, in ng, of sulfurdioxide in a 250 cm3 sample of polluted air in 2020.  mass = ng State one source of sulfurdioxide in the atmosphere. State one adverse effect of sulfur dioxide in the atmosphere. Choose the compound used to remove sulfur dioxide in flue gas desulfurisation. Tick (✓) one box. aluminium chloride calcium oxide methane sulfuric acid  Hydrochloricacid reacts with sodium sulfite. The products are sodium chloride, sulfur dioxide and a liquid which turns anhydrous cobalt(chloride pink. Complete the symbol equation for this reaction. Na2SO3 + HCl → 2NaCl + SO2 +  Name the acidified solution used to test for sulfurdioxide gas and state the observations. acidified solution observations  Ammonia forms an alkaline solution in water. Give the formula of the ion that is present in all alkaline solutions. Choose from the list the pH value for an alkaline solution. Draw a circle around your chosen answer. pH 1 pH 4 pH 7 pH 13 
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
10. Chemistry of the environment  →  10.3. Air quality and climate
Open
4
Bromine is a liquid at room temperature. State two general properties of a liquid.  Fig.4.1 shows the physical states of bromine. solid bromine liquid bromine bromine gas A B Name the changes of physical states A and B. A B  Describe liquid bromine and bromine gas in terms of the arrangement and motion of the particles. liquid bromine arrangement motion bromine gas arrangement motion  A sealed gas syringe contains 80 cm3 of bromine gas. State how decreasing the pressure affects the volume of bromine gas in the gas syringe when the temperature remains constant. 
1. States of matter  →  1.1. Solids, liquids and gases
Open
5
This question is about metals and metal compounds. Table5.1 shows some properties of some GroupI metals. Table 5.1 metal melting point in °C boiling point in °C observations on reaction with water solubility of metal hydroxide in g / dm3 at room temperature sodium bubbles form rapidly but no flame potassium rubidium explodes caesium explodes Use the information in Table 5.1 to predict: the melting point of rubidium ���������������������������������������������������������������������������������������� the solubility of sodium hydroxide at room temperature ����������������������������������������������� the observations when potassium reacts with water the physical state of caesium at 20 °C. Give a reason for your answer. physical state reason Iron is extracted in a blast furnace by reduction of iron(oxide, Fe2O3, with carbonmonoxide. Carbonmonoxide is produced by the reaction of carbon with carbondioxide. C + CO2 → 2CO Explain how this equation shows that carbondioxide is reduced. Name the type of chemical reaction where oxidation and reduction take place simultaneously. Calciumcarbonate is added to the blast furnace. The calciumcarbonate undergoes thermal decomposition. State the meaning of the term thermal decomposition. Stainless steel is an alloy of iron. Give one reason why alloys are more useful than pure metals. Brass is an alloy. Choose the diagram, A, B, C or D, in Fig.5.1 that best shows the structure of brass. Zn Zn Cu Zn Cu Cu Zn Cu Cu Zn Cu Zn A Cu Cu Cu Cu Cu Zn Zn Zn Zn Zn B Cu Fe Fe Zn Cu Cu Zn Zn Fe Cu Zn Fe C Fe Fe Fe Zn Zn Fe Fe Fe Fe Zn Fe Zn D diagram Table 5.2 gives some observations about the reactivity of four metals with dilute hydrochloricacid. Table 5.2 metal observations iron bubbles form slowly magnesium bubbles form very quickly mercury no bubbles form tin bubbles form very slowly Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive 
9. Metals  →  9.4. Reactivity series
9. Metals  →  9.1. Properties of metals
9. Metals  →  9.6. Extraction of metals
Open
6
A student investigates the reaction of large pieces of magnesium carbonate with dilute hydrochloricacid at 20 °C. The magnesiumcarbonate is in excess. Fig.6.1 shows the volume of carbondioxide gas released as the reaction proceeds. time / min volume of carbon dioxide gas / cm3 Deduce the volume of carbondioxide gas released after 2minutes.  volume of carbon dioxide = cm3 The student repeats the experiment using the same volume of hydrochloricacid but with a higher concentration. The magnesiumcarbonate is still in excess. All other conditions stay the same. Draw a line on the grid in Fig.6.1 to show the volume of carbondioxide released when hydrochloricacid with a higher concentration is used. The student repeats the experiment using smaller pieces of magnesium carbonate. All other conditions stay the same. Describe how the rate of reaction differs when smaller pieces of magnesiumcarbonate are used. The student repeats the experiment at 10 °C. All other conditions stay the same. Describe how the rate of reaction differs when the temperature is 10 °C. Hydrochloricacid reacts with iron. Complete the word equation for this reaction. hydrochloric acid + iron → +  Acids are used as catalysts in many chemical reactions. State the meaning of the term catalyst. 
6. Chemical reactions  →  6.2. Rate of reaction
9. Metals  →  9.4. Reactivity series
Open
7
Fig.7.1 shows the displayed formula of compound S. H C H C C H H H O O O H On Fig.7.1, draw a circle around the carboxylic acid functional group. Deduce the molecular formula of compound S. CompoundS can be converted to acrylicacid. The molecular formula of acrylic acid is C3H4O2. Complete Table7.1 to calculate the relative molecular mass of acrylic acid. Table 7.1 atom number of atoms relative atomic mass carbon 3 × 12 = 36 hydrogen oxygen  relative molecular mass = Acrylic acid is an unsaturated compound. Describe a test for an unsaturated compound. test observations  When left in the air, acrylic acid forms a polymer. State the meaning of the term polymer. Polyis also a polymer. Choose from the list the type of polymerisation that occurs when polyis made. Draw a circle around your chosen answer. substitution oxidation neutralisation addition Ethanoicacid is a carboxylic acid. Complete the word equation for the reaction of ethanoicacid with sodiumhydroxide. ethanoic acid + sodium hydroxide → +  Ethanoicacid can be converted to ethanol. Name the two products formed when ethanol undergoes complete combustion. and ������������������������������������������������������������������� 
11. Organic chemistry  →  11.2. Naming organic compounds
11. Organic chemistry  →  11.7. Carboxylic acids
Open
8
Lithiumbromide is a compound with ionic bonding. State the meaning of the term ionic bond. Complete Fig.8.1 to show: ● the electronic configuration of a lithium ion ● the charge on the ion. Li  Deduce the number of protons and neutrons in the bromide ion shown. 79Br – number of protons number of neutrons  Molten lithiumbromide is electrolysed using graphite electrodes. State the names of the product at each electrode and give the observations at the positive electrode. product at the negative electrode product at the positive electrode observations at the positive electrode  Fig.8.2 shows the structure of graphite. State the type of bonding in graphite. Explain by referring to Fig.8.2 why graphite is used as a lubricant. Graphite and diamond are both forms of carbon. State one use of diamond. 
2. Atoms, elements and compounds  →  2.6. Giant covalent structures
4. Electrochemistry  →  4.1. Electrolysis
Open