9.2. Uses of metals
A subsection of Chemistry, 5070, through 9. Metals
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This question is about metals. Chromium is a transition element. Sodium is an element in Group I of the Periodic Table. State two physical properties of chromium that are different to those of sodium. Deduce the number of protons and neutrons in the chromium atom shown. 24 Cr number of protons number of neutrons Chromium(oxide, Cr2O3, reacts with carbon and chlorine to produce chromium(chloride, CrCl3, and carbon monoxide. Construct the symbol equation for this reaction. Complete the diagram in to show the electronic configuration of a sodium ion. Include the charge on the ion. Na Table 2.1 shows the observations made when four different metals are heated in oxygen. Table 2.1 metal observations lanthanum forms a layer of oxide rapidly on the surface but does not burn mercury does not form a layer of oxide on the surface nickel forms a layer of oxide slowly on the surface but does not burn sodium burns rapidly Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive Aluminium is used in food containers and overhead electrical cables because it is resistant to corrosion. Explain why aluminium is resistant to corrosion. State two other reasons why aluminium is used in overhead electrical cables.
5070_w23_qp_22
THEORY
2023
Paper 2, Variant 2
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