THE UNKNOWN SOLUTION TEAM

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(3ai) To convert an aqueous solution of copper sulfate (CuSO₄) to an aqueous solution of zinc sulfate (ZnSO₄), you can use a displacement reaction involving zinc. CuSO₄(aq) + Zn(s) ---> ZnSO₄ (aq) + Cu(s) In this reaction, zinc (Zn) displaces copper (Cu) from copper sulfate (CuSO₄) because zinc is more reactive than copper. The zinc sulfate (ZnSO₄) formed is soluble in water and remains in the solution. (3aii) CuSO₄(aq) + Zn(s) ---> ZnSO₄ (aq) + Cu(s) (3b) (i) A titrant is a solution of known concentration that is used to determine the concentration of another solution through a chemical reaction. It is added to the solution being analyzed during a titration. (ii) Concordant titres refer to the multiple titration results that are within a narrow range of values, indicating that they are consistent and reliable. When the titration results are concordant, it means they are close to each other, and their average can be taken as an accurate measurement.

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I Edited the numbering. The 4e is 4c... I was doing fast.... See the correction 👆👆

(4ai) Air is a mixture of gases, primarily composed of nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. (4aii) Nitrogen (4aiii) A noble gas is an element from Group 18 of the periodic table, characterized by its stable and inert nature. (4aiv) (i) They are chemically inert (ii) They have a full outer electron shell (iii ) They exist as colorless, odorless gases at room temperature. (4bi) (PICK ANY TWO) (i) Calcium chloride (ii) Sodium sulfate (iii) Potassium hydroxide (iv) Anhydrous calcium sulfate (4bii) N2 + 3H2 ----> 2NH3 (4biii) It is often done through upward displacement of air or downward delivery into a container. (4biv) Differences in the method of collection of gases depend on factors such as the gas's density, solubility, and reactivity with atmospheric components. (4ci) -Haematite undergoes reduction -Coke acts as a reducing agent and provides heat. -Limestone undergoes decomposition to form calcium oxide. (4cii) Cast iron is brittle and contains a higher percentage of carbon compared to wrought iron, which is malleable and has a lower carbon content. (4ciii) Conditions favoring the conversion of sulfur (IV) oxide to sulfur (VI) oxide include low temperature, high pressure, and the presence of a catalyst. (4di) Both diamond and graphite have high melting points due to the strong covalent bonds between carbon atoms in their structures. In diamond, each carbon atom forms four strong covalent bonds in a tetrahedral structure, while in graphite, carbon atoms are arranged in layers held together by weak van der Waals forces. (4dii) (I) Copper would react with silver trioxonitrate (V) but not with zinc trioxonitrate (V). (II) The solution would change color, and silver metal would be observed as a solid precipitate.

(4dii) (I) Copper would react with silver trioxonitrate (V) but not with zinc trioxonitrate (V). (II) The solution would change color, and silver metal would be observed as a solid precipitate.