9. Metals
A section of Chemistry, 0620
Listing 10 of 1272 questions
A student investigates the reaction of calciumcarbonate with dilute hydrochloricacid. CaCO3 + 2HCl CaCl 2 + CO2 + H2O The student measures the mass of the reaction mixture at 10 second intervals using the apparatus shown. 250.00 g calcium carbonate cotton wool dilute hydrochloric acid The graph shows the results when 5.0 g of calciumcarbonate is added to an excess of dilute hydrochloricacid. time / s mass / g Suggest why the reaction mixture decreases in mass as the reaction proceeds. Calculate the loss of mass in grams when the reaction is complete.  loss in mass = g The experiment is repeated using dilute hydrochloricacid of twice the concentration. All other conditions are kept the same. On the grid, draw a graph to show how the mass changes with time using dilute hydrochloricacid of twice the concentration. The original experiment is repeated at three different temperatures. All other conditions are kept the same. The three temperatures are 20 °C, 30 °C and 40 °C. Complete the table by writing the temperatures in the first column. temperature in °C initial rate of reaction in g / s 0.16 0.64 0.32  Complete the sentences about the use of calciumcarbonate in the extraction of iron using words from the list. bauxite dioxide hematite monoxide silicon slag The main ore of iron is called . The main impurity in the iron ore is silicon(oxide. Calcium carbonate added to the blast furnace decomposes to form calcium oxide and carbon . The calcium oxide reacts with the silicon(oxide to form .  
0620_w18_qp_31
THEORY
2018
Paper 3, Variant 1
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Glass can be made by heating a mixture of sand, sodium carbonate and limestone (calciumcarbonate). Calculate the relative formula mass of sodiumcarbonate, Na2CO3. Show all your working. Use your Periodic Table to help you.  relative formula mass = Sodium carbonate can be manufactured by the reaction between limestone and sodiumchloride. The reaction is endothermic. What is meant by the term endothermic? During this glass-making process, limestone decomposes into lime (calcium oxide). Lime is used to treat acidic soils. What type of chemical reaction occurs when lime reacts with acidic soils? Draw a circle around the correct answer. addition neutralisation oxidation reduction  Charcoal can be burned in an excess of clean, dry air to provide the heat needed to make glass. Which gas is 21% of clean, dry air? Write a word equation for carbon burning in an excess of air. Complete the energy level diagram for this reaction by adding these two words: ● reactants ● product energy progress of reaction  Argon is also present in clean, dry air. Give one use of argon. Which two of the following statements about argon are correct? Tick two boxes. Argon is unreactive. Argon is diatomic. Argon is monatomic. Argon forms ionic compounds. Argon is a greenhouse gas.  
0620_w18_qp_31
THEORY
2018
Paper 3, Variant 1
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A student investigates the rate of reaction of iron powder with dilute hydrochloricacid. dilute hydrochloric acid iron powder Complete the diagram to show the apparatus the student could use to collect and measure the gas produced. Label your diagram. The graph shows the results the student obtained using dilute hydrochloricacid of concentration 0.2 mol / dm3 and an excess of iron powder. time / minute volume of gas / cm3 Use the graph to deduce: the time that the reaction was complete the volume of gas produced when the reaction was complete. The student repeated the experiment using a lower concentration of dilute hydrochloricacid. All other conditions were kept the same. On the grid, draw a graph to show how the volume of gas changes with time when a lower concentration of dilute hydrochloricacid is used. Iron is extracted from iron ore using a blast furnace. The solid substances added to the blast furnace are iron ore, coke and limestone (calciumcarbonate). State the name of an ore of iron. Complete the sentences about the reactions which occur in a blast furnace using words from the list. air decomposes dioxide monoxide nitrogen oxidises slag tetrachloride The coke burns in a blast of hot to form carbondioxide. This reacts with further hot coke to form carbon . This gas reduces the iron(oxide in the iron ore to iron. The limestone to form lime (calciumoxide) which reacts with impurities in the iron to form .  
0620_w18_qp_33
THEORY
2018
Paper 3, Variant 3
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Magnesium, calcium and strontium are GroupII elements. Complete the table to show the arrangement of electrons in a calcium atom. shell number number of electrons  Describe how the arrangement of electrons in a strontium atom is: similar to the arrangement of electrons in a calcium atom different from the arrangement of electrons in a calcium atom.  Calcium reacts with cold water to form two products: ● ● a colourless gas, P, which ‘pops’ with a lighted splint ● ● a weakly alkaline solution, Q, which turns milky when carbondioxide is bubbled through it. Name gas P. Identify the ion responsible for making solution Q alkaline. Suggest the pH of solutionQ. Write a chemical equation for the reaction of calcium with cold water. Magnesium reacts with chlorine to form magnesiumchloride, MgCl 2. Magnesiumchloride is an ionic compound. Complete the diagrams to show the electronic structures of the ions in magnesiumchloride. Show the charges on the ions. Cl Mg Cl  Give three physical properties that are typical of ionic compounds such as MgCl 2.  Aqueous magnesiumchloride is added to aqueous silvernitrate. A white precipitate forms. Write an ionic equation for this reaction. Include state symbols. 
0620_w18_qp_42
THEORY
2018
Paper 4, Variant 2
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Tin is a metallic element in Group IV. Its main ore is cassiterite which is an impure form of tin(oxide, SnO2. Tin also occurs in stannite, Cu2FeSnS4. Calculate the relative formula mass, Mr, of Cu2FeSnS4. Mr of Cu2FeSnS4 = The Mr of SnO2 is 151. Calculate the percentage of tin by mass in SnO2. percentage of tin by mass in SnO2 = The percentage of tin by mass in Cu2FeSnS4 is 27.6%. Use this information and your answer to to suggest whether it would be better to extract tin from SnO2 or Cu2FeSnS4. Explain your answer. Tin can be extracted by heating tin(oxide with carbon. Carbonmonoxide is the other product. Write a chemical equation for this reaction. The position of tin in the reactivity series is shown. iron most reactive tin copper least reactive A student added iron to a solution containing Sn2+ ions. The student then separately added tin to a solution containing Cu2+ ions. Complete the ionic equations. If there is no reaction write ‘no reaction’. Fe + Sn2+ Sn + Cu2+ Copper(nitrate, Cu(NO3)2, decomposes when it is heated. The only solid product is copper(oxide, CuO. There are two gaseous products. One of the gaseous products is oxygen. Describe a test for oxygen. test result  Name the other gaseous product. Describe its appearance. name appearance  Write a chemical equation for the thermal decomposition of copper(nitrate. Iron does not rust when it is completely coated with zinc. When the zinc is scratched, the iron still does not rust. Explain why the iron does not rust when it is completely coated with zinc. Explain why the iron still does not rust when the zinc is scratched.
0620_w18_qp_43
THEORY
2018
Paper 4, Variant 3
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Questions Discovered
1272