0620_s23_qp_33
A paper of Chemistry, 0620
Questions:
8
Year:
2023
Paper:
3
Variant:
3
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1
Fig.1.1 shows part of the Periodic Table. I II III IV V VI VII VIII Li Al Ar C N O F Ca Fe Cr Cu Br I Answer the following questions using only the elements in Fig.1.1. Each symbol of the element may be used once, more than once or not at all. Give the symbol of the element that: is present in diamond forms an oxide that contributes to acid rain has an atom with five occupied electron shells forms an ion with a charge of 1+ forms an ion that gives a red-brown precipitate on addition of aqueous ammonia is used in the manufacture of aircraft because of its low density. 
8. The Periodic Table  →  8.1. Arrangement of elements
2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table
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Table2.1 shows some properties of the halogens. Table 2.1 halogen melting point in °C boiling point in °C density at room temperature and pressure in g / cm3 fluorine –220 –188 chlorine –101 0.003 bromine –7 +59 3.12 iodine +114 +184 4.93 Use the information in Table2.1 to predict: the boiling point of chlorine ������������������������������������������������������������������������������������������� the density of fluorine at room temperature and pressure �������������������������������������������� the physical state of iodine at +100 °C. Give a reason for your answer. physical state reason  Aqueous chlorine reacts with aqueous sodium bromide. Complete the word equation for this reaction. chlorine + sodium bromide → +  State a test for sodium ions. test observations  
8. The Periodic Table  →  8.3. Group VII properties
10. Chemistry of the environment  →  10.1. Water
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Polluted water can contain harmful substances such as metal compounds, nitrates and sewage. Name two other substances present in polluted water which are harmful to aquatic life.  State why sewage can cause disease. Table3.1 shows the masses of ions, in mg, present in 1000 cm3 of polluted water. Table 3.1 name of ion formula of ion mass of ion present in mg / 1000 cm3 of polluted water ammonium NH4 + 1.2 calcium Ca2+ 2.2 chloride Cl – 2.5 hydrogencarbonate HCO3 – 13.0 magnesium Mg2+ 1.0 nickel(Ni2+ 0.2 nitrate NO3 – 0.4 potassium K+ 6.3 silicate SiO3 2– 8.0 sodium Na+ 12.2 SO4 2– 0.1 Answer these questions using information from Table3.1. Name the positive ion present in the lowest concentration. State the name of the ion SO4 2–. Calculate the mass of calcium ions present in 250 cm3 of polluted water.  mass = mg Cobalt(chloride can be used to test for the presence of water. CoCl 2+ 6H2OCoCl 2•6H2Oblue cobalt(pink cobalt(chloride chloride Describe how pink cobalt(chloride can be changed to blue cobalt(chloride. Choose a word from the list which best describes pink cobalt(chloride. Draw a circle around your chosen answer. anhydrous hydrated liquid reduced Iron reacts with steam to form Fe3O4 and a gas which pops with a lighted splint. Complete the symbol equation for this reaction. 3Fe + H2O → Fe3O4 + 4  
10. Chemistry of the environment  →  10.1. Water
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
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This question is about bromine and compounds of bromine. Deduce the number of protons, neutrons and electrons in the bromide ion shown. 81Br – number of protons number of neutrons number of electrons  Hydrogenbromide decomposes to hydrogen and bromine when heated. Fig.4.1 shows an incomplete reaction pathway diagram for this reaction. energy progress of reaction Complete Fig.4.1 by writing these formulae on the diagram: ● 2HBr ● H2 + Br2. Explain how Fig.4.1 shows that the reaction is endothermic. Complete this sentence about an endothermic reaction using a word from the list. products reactants bromine surroundings An endothermic reaction transfers thermal energy from the . Hydrobromicacid is formed when hydrogen bromide dissolves in water. Write the formula of the ion which is present in all acids. Complete the word equation for the reaction of any acid with any carbonate. acid + carbonate → + +  A few drops of litmus indicator are added to a dilute acid. State the colour of the solution. Fig.4.2 shows the apparatus used for the electrolysis of molten lead(bromide using graphite electrodes. power supply + – Label Fig.4.2 to show: ● the cathode ● the electrolyte. Name the products and state the observations at the positive and negative electrodes. product at the positive electrode observations at the positive electrode product at the negative electrode observations at the negative electrode  State one property of graphite that makes it useful as an electrode. 
4. Electrochemistry  →  4.1. Electrolysis
11. Organic chemistry  →  11.5. Alkenes
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This question is about metals. Nickel is a transition element. Sodium is an element in GroupI of the Periodic Table. State two differences in the physical properties of nickel compared to sodium.  Stainless steel is an alloy that is used to make cutlery. Give one reason why stainless steel is used to make cutlery. Table5.1 shows some information about the reaction of four metals with oxygen. Table 5.1 metal reaction with oxygen gold no reaction lanthanum forms a layer of oxide rapidly but does not burn magnesium burns rapidly to form an oxide nickel forms a layer of oxide slowly but does not burn Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Complete the diagram in Fig.5.1 to show the electronic configuration of a magnesium atom. Mg  
9. Metals  →  9.4. Reactivity series
9. Metals  →  9.1. Properties of metals
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A student investigates the reaction of magnesium with dilute hydrochloricacid at three different temperatures. The temperatures are: ● 20 °C ● 30 °C ● 40 °C. All other conditions stay the same. Table6.1 shows the time taken for each reaction to finish. Table 6.1 temperature / °C time taken for the reaction to finish / s Complete Table6.1 by writing the temperatures in the first column. Describe the effect on the time taken for the magnesium to finish reacting with dilute hydrochloricacid when the surface area of the magnesium is increased. All other conditions stay the same. Describe the effect on the time taken for the magnesium to finish reacting with dilute hydrochloricacid when the concentration of acid is decreased. All other conditions stay the same. Describe how crystals of magnesium chloride can be prepared after reacting excess magnesiumwith dilute hydrochloricacid. Magnesium chloride is soluble in water. Choose one other compound that is soluble in water. Tick (✓) one box. ammonium sulfate calcium carbonate iron(hydroxide silver chloride  
9. Metals  →  9.4. Reactivity series
6. Chemical reactions  →  6.2. Rate of reaction
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Fig.7.1 shows the displayed formula of compoundE. C H C H H C H O H C H H H On Fig.7.1 draw a circle around the functional group that makes compoundE unsaturated.  Deduce the molecular formula of compoundE. Describe a chemical test to distinguish between a saturated and an unsaturated compound. test observations with saturated compound observations with unsaturated compound  Alcohols have an –OH functional group. Write the general formula for the alcohol homologous series. Ethanol is an alcohol with two carbon atoms in each molecule. Draw the displayed formula of ethanol.  Ethanol reacts to form a compound with the formula C6H12O2. Complete Table7.1 to calculate the relative molecular mass of C6H12O2. Table 7.1 atom number of atoms relative atomic mass carbon 6 × 12 = 72 hydrogen oxygen  relative molecular mass = Ethanol can be manufactured by the fermentation of aqueous glucose. State two conditions for fermentation.  Ethanol can be oxidised to ethanoicacid. Complete the word equation for the reaction of ethanoicacid with sodium. ethanoic acid + sodium → +  
11. Organic chemistry  →  11.2. Naming organic compounds
11. Organic chemistry  →  11.6. Alcohols
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This question is about non-metals. Non-metals are poor thermal conductors. Describe two other physical properties which are typical of non-metals.  Carbondioxide contributes to increased global warming which leads to climate change. State two strategies which help to reduce climate change caused by carbondioxide.  Water is a simple molecular compound. Complete Fig.8.1 to show the dot-and-cross diagram for a molecule of water. Show outer shell electrons only. O H H  State two properties of simple molecular compounds.  Water is a good solvent. State the meaning of the term solvent. Pure water has a neutral pH value. Choose from the list, the pH value that is neutral. Draw a circle around your chosen answer. pH 1 pH 3 pH 7 pH 14 A crystal of blue copper(sulfate is placed at the bottom of a beaker of water as shown in Fig.8.2. at first after one day water crystal of copper(sulfate After one day, the blue colour has spread throughout the water in the beaker. Explain these results in terms of the kinetic particle theory. 
9. Metals  →  9.1. Properties of metals
2. Atoms, elements and compounds  →  2.5. Simple molecules and covalent bonds
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