9. Metals
A section of Chemistry, 0620
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This question is about metals. State three general physical properties common to most metals.  Metals are often used in the form of alloys. State the meaning of the term alloy. Explain in terms of their properties why alloys are used instead of pure metals. Stainless steel is an alloy. Give one use of stainless steel. Place these metals in order of their reactivity with oxygen. copper magnesium potassium zinc Put the least reactive metal first. least reactive most reactive  When 4.8 g of magnesium reacts with excess oxygen, 8.0 g of magnesiumoxide is formed. Calculate the minimum mass of magnesium needed to produce 24.0 g of magnesiumoxide.  minimum mass = g 
0620_m22_qp_32
THEORY
2022
Paper 3, Variant 2
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This question is about metals and compounds of metals. Table4.1 shows some properties of five metals, A, B, C, D and E. Table 4.1 metal density in g / cm3 melting point in °C colour of metal chloride A 5.90 white B 5.96 green C 11.34 white D 8.90 yellow E 1.53 white State which two of these metals, A, B, C, D and E, are transition elements. Give two reasons for your answer using only the information in Table4.1. metals and reason 1 reason 2  Choose the metal chloride that is insoluble in water. Tick (✓) one box. magnesium chloride potassium chloride silver chloride sodium chloride  Magnesium chloride is produced when magnesium burns in chlorine. Mg + Cl 2 → MgCl 2 shows an incomplete reaction pathway diagram for this reaction. progress of reaction energy Complete Fig.4.1 by writing these formulae on the diagram: ● Mg + Cl 2 ● MgCl 2.  Explain how Fig.4.1 shows that the reaction is exothermic. Table4.2 shows the reactions of four different metals with steam. Table 4.2 metal reaction with steam iron reacts slowly magnesium reacts very rapidly nickel reacts very slowly niobium does not react Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  A compound of nickel has the molecular formula NiP4F12. Complete Table4.3 to calculate the relative molecular mass of NiP4F12. Table 4.3 atom number of atoms relative atomic mass fluorine 12 × 19 = 228 nickel phosphorus  relative molecular mass = 
0620_m23_qp_32
THEORY
2023
Paper 3, Variant 2
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