9.4. Reactivity series
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 452 questions
Four statements about the reactions of oxides with dilute hydrochloric acid and with aqueous sodium hydroxide are listed. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. Calcium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. Copper(oxide reacts with dilute hydrochloric acid but not with aqueous sodium hydroxide. Sulfur dioxide does not react with either dilute hydrochloric acid or aqueous sodium hydroxide. Which statements are correct?
0620_s24_qp_21
MCQ
2024
Paper 2, Variant 1
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Table 2.1 shows the percentages by mass of the elements present in the human body. Table 2.1 element percentage by mass of element calcium 1.50 carbon 18.00 chlorine 0.15 hydrogen 10.00 magnesium 0.05 nitrogen 3.00 oxygen 65.00 phosphorus 1.00 potassium 0.35 sodium 0.15 sulfur 0.25 other elements 0.55 Answer these questions using information from Table 2.1. Name the non-metallic element in Table 2.1 that has the lowest percentage by mass. Name an element in Table 2.1 that is in Period 4 of the Periodic Table. Some medicines contain a compound made of Mg2+ ions and OH– ions. Name the compound made of Mg2+ ions and OH– ions. Describe the observations when aqueous sodium hydroxide is added dropwise to a solution containing calcium ions until the sodium hydroxide is in excess. observations with dropwise addition of sodium hydroxide observations with excess sodium hydroxide  Name a calcium salt that is soluble in water. Table 2.2 shows some properties of the Group I metals. Table 2.2 metal melting point / °C observations on reaction with water lithium sodium bubbles form rapidly but no flame potassium bubbles form very rapidly and flame rubidium explodes Use the information in Table 2.2 to predict: ● the melting point of potassium ● the observations when lithium reacts with water.   State how the density of the Group I elements changes down the group. Sodium reacts with water to produce sodium hydroxide and a gas which pops with a lighted splint. Complete the symbol equation for this reaction. Na + 2H2O → 2NaOH +  
0620_s24_qp_31
THEORY
2024
Paper 3, Variant 1
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Chromium and iron are transition elements. They are ductile and have high melting and boiling points. State three other physical properties of chromium.  The formula for rust is Fe2O3•xH2O. State the chemical name of rust. An iron object is coated with plastic. Explain how this prevents the iron from rusting. Chromium behaves as a typical metal when it reacts with sulfuric acid. Complete the word equation for this reaction. chromium + sulfuric acid → +  The list shows five metals. aluminium calcium copper iron zinc Put these metals in order of their reactivity. Put the most reactive metal at the top. least reactive most reactive  Zinc can be produced by heating zinc oxide with carbon. ZnO + C → Zn + CO Describe how this equation shows that zinc oxide is reduced. 
0620_s24_qp_33
THEORY
2024
Paper 3, Variant 3
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This question is about metals. shows a blast furnace used to extract iron from its ore. waste gases slag air air A Coke and iron ore are added at the top of the blast furnace. Name one other substance that is added at the top of the blast furnace. Name the substance that leaves the blast furnace at A. Slag is produced from an impurity in iron ore. Name the impurity in iron ore that is converted into slag. Name two substances that react together to produce the high temperature in the blast furnace. and Name two waste gases that leave the blast furnace.  Zinc is produced from zinc oxide in a furnace. The zinc is produced as a gas. It then forms molten zinc. Suggest why the zinc produced inside the furnace is a gas. State the name of the physical change that occurs when gaseous zinc is converted into molten zinc. Zinc is used to coat iron to prevent rusting. Name the process used to coat iron with zinc as a method of rust prevention. When the zinc coating is scratched, the iron underneath does not rust. Explain why the iron underneath the zinc does not rust. Zinc oxide neutralises both acids and bases. State the general name given to oxides that neutralise both acids and bases. When zinc oxide neutralises aqueous sodium hydroxide, sodium zincate is formed. The formula of the zincate ion is ZnO2 2–. Deduce the formula of sodium zincate. Name the zinc compound that forms when zinc oxide neutralises dilute sulfuric acid. 
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THEORY
2024
Paper 4, Variant 1
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Questions Discovered
452