0620_s06_qp_2
A paper of Chemistry, 0620
Questions:
6
Year:
2006
Paper:
2
Variant:
0
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1
Use The diagram shows models of various elements. B E D A C Define the term element. Which one of the models A to E represents a solid containing diatomic molecules? Which two of the models A to E represent gases? and Which one of the models A to E represents diamond? State the name of the element present in diamond. State a use of diamond other than in jewellery. Examiner's Use Structure E is a metal. State three physical properties which are characteristic of all metals. Metals are sometimes mixed with other elements in order to change their properties. What is the name given to a mixture of metals with other elements? Match up the metals in the boxes on the left with their uses on the right. The first one has been done for you. for making chemical plants for plating tin cans for car bodies for electrical wiring in houses for aircraft bodies tin mild steel stainless steel aluminium copper
9. Metals  →  9.2. Uses of metals
9. Metals  →  9.1. Properties of metals
8. The Periodic Table  →  8.1. Arrangement of elements
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2
Use The diagram shows a biogas digester. Animal and vegetable waste is fermented by bacteria. The gas produced is a mixture of mainly carbon dioxide and methane. gas gas out gas holder animal and vegetable waste solid residue fermentation chamber State the name given to the energy-releasing process in which organisms use food and produce carbon dioxide. Hydrogen is also produced during the fermentation. The hydrogen reacts with the carbon dioxide to form methane and oxygen. Complete the equation for this reaction. CO2 + 2H2 + Suggest a use for the methane produced in this reaction. Describe the arrangement and motion of the molecules in methane gas. arrangement motion State the name of the homologous series to which methane belongs. Which one of the following compounds belongs to the same homologous series as methane? Tick one box. C2H4 C2H6 CH3OH CH3CO2H Examiner's Use Which one of the following equations A, B, C or D describes fermentation? A CH4 + H2O CO + 3H2 B C6H12O6 + 6O2 6H2O + 6CO2 C C6H12O6 2C2H5OH + 2CO2 D C6H14 C4H10 + C2H4 Many of the reactions occurring in the biogas digester are catalysed by enzymes. Suggest where the enzymes come from. Define the term catalysis. The solid residue from the biogas digester can be used as a fertiliser. State the names of two non-metallic elements found in fertilisers which are needed for plant growth. and
6. Chemical reactions  →  6.2. Rate of reaction
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
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3
Use The electronic structures of various atoms are shown below. A B D E C Which one of these structures A to E represents a noble gas? Which two of these structures represent atoms from the same Group of the Periodic Table? and Which one of these structures represents an atom with an atomic number of 8? Which one of these structures forms a stable ion by gaining one electron? Which one of these structures is in Period 3 of the Periodic Table? Examiner's Use Complete the following sentences using words from the list. chlorine diamond high low sharing sodium strong transfer weak Covalent bonds are formed by the of pairs of electrons. Simple covalent molecules such as and bromine have melting points. Giant covalent structures such as have many bonds and have high melting points. The simplest covalent molecule is hydrogen. Draw a diagram to show how the electrons are arranged in a hydrogen molecule. Describe a test for hydrogen. test result
2. Atoms, elements and compounds  →  2.5. Simple molecules and covalent bonds
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4
Use Coal gas is made by heating coal in the absence of air. The table shows the composition of coal gas. name of gas % of gas in coal gas hydrogen methane carbon monoxide carbon dioxide nitrogen ethene oxygen Which element in this table is a highly flammable gas? Which compound in the table is an alkene? Which compound in the table turns limewater milky? Describe a test you can use to distinguish between ethene and methane. test result with ethene result with methane Examiner's Use Molecules of ethene can react with each other to make poly. What is the name given to this type of reaction? Which formula below best represents a molecule of poly? Tick one box. C C H H H H n C C H H H CH3 n C C H H n C C H H H H Ethene can be manufactured by breaking down hydrocarbons into smaller molecules using high temperatures and a catalyst. State the name given to this type of reaction. A liquid is also formed when coal is heated in the absence of air. This liquid contains a high percentage of ammonia. Describe a test for ammonia. test result Ammonia has the formula NH3. Calculate the relative molecular mass of ammonia. Coal contains a small amount of sulphur. Explain why burning coal is harmful to the environment.
11. Organic chemistry  →  11.3. Fuels
11. Organic chemistry  →  11.5. Alkenes
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5
Use The diagram shows a cross section of a soil. decaying leaves topsoil subsoil limestone A student took 10 g of topsoil and shook it with 200 cm3 of distilled water. How can the student separate the solids in the soil from the solution? The topsoil had a pH of 6. Which of the following gives the best description of this pH? Tick one box. strongly acidic weakly acidic neutral weakly alkaline Examiner's Use The soil contained large amounts of calcium ions and carbonate ions. Use the information in the diagram to suggest where these ions came from. Complete the word equation for the reaction of calcium carbonate with hydrochloric acid. calcium carbonate + + hydrochloric acid calcium chloride + The table shows the mass of each ion present in 200 cm3 of soil solution. ion formula of ion mass present/milligrams calcium Ca2+ carbonate - CO iron(Fe3+ magnesium Mg2+ nitrate - NO phosphate - PO others Which negative ion has the highest concentration in the soil solution? Calculate the mass of iron(ions in one litre (1000 cm3) of solution. Which ion in the table will release ammonia when heated with aqueous sodium hydroxide and aluminium foil? Describe a test for iron(ions. test result Examiner's Use The air trapped in the soil has a different composition from the air in the atmosphere. The table shows the composition of the air in the soil. gas percentage of gas in soil air carbon dioxide nitrogen oxygen other gases State how the composition of soil air compares with the composition of air in the atmosphere. carbon dioxide nitrogen oxygen Decaying leaves produce ethanoic acid. Complete the formula for ethanoic acid showing all atoms and bonds. C C H H H
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
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6
Use Iron is extracted from iron ore by heating the iron ore with coke and limestone. State the name of the ore from which iron is extracted. The coke burns in a blast of hot air to form carbon monoxide. Complete the equation for this reaction. C + O2 CO State an adverse effect of carbon monoxide on human health if it were to escape from the blast furnace. Near the top of the blast furnace, carbon monoxide reacts with iron ore. Fe2O3 + 3CO 2Fe + 3CO2 Write a word equation for this reaction. What type of chemical reaction is the conversion of Fe2O3 to 2Fe? Examiner's Use The limestone is converted to calcium oxide and carbon dioxide by the intense heat in the furnace. CaCO3 CaO + CO2 What type of chemical reaction is this? Name a use of limestone other than in the blast furnace. The calcium oxide reacts with silica and alumina in the iron ore. The product of this reaction collects on top of the molten iron at the bottom of the furnace. What is the name of this product? Put a ring around the correct answer. bauxite sand slag slaked lime The iron obtained from the blast furnace contains the following impurities. carbon manganese phosphorus silicon Which one of these elements is a transition element? What type of oxide is phosphorus oxide? Put a ring around the correct answer. acidic amphoteric basic neutral 50 tonnes of impure cast iron from the blast furnace contains 47 tonnes of iron. Calculate the percentage of the impurities in the cast iron.
9. Metals  →  9.6. Extraction of metals
9. Metals  →  9.4. Reactivity series
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
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