Hong Kong F.3 Chemistry Homework Questions (Urgent!)?

Question

Hello, everyone. I am doing a worksheet about chemistry. Can anyone help me to answer these questions?
1. Reaction with hydrochloric acid of Silver, aluminium, copper.
2. Chemical component of the ore of Silver, aluminium,copper.
3. Method of extraction of copper.
4. Reaction with oxygen of iron and copper.

Answer 1

1. Assuming metallic forms, there will be no reaction with Ag.
Reaction with Aluminum produces hydrogen and Aluminum chloride, with Copper, hyfrogen and copper chloride.

2. The ores of silver, aluminum and copper can either be in the form of oxides, carbonates although silver ores are essentially found in native or metallic form. Alunimum has many ore compositions but the majority are in the form of silicates.

3. Copper is usually roasted in a smelting plant and further refined by electrolysis.

4. You get oxides of iron like FeO, Fe2O3, Fe3O4, and oxides of copper like CuO and Cu2O.

Answer 2

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Answer 3

1. HCl does not react with silver or copper.

HCl reacts with aluminum to produce H2 and AlCl3 (Hydrogen gas and aluminum chloride).

2. Latter

3. Latter

4. 4 Fe +3 O2 --> 2 Fe2O3
2 Cu + O2 --> 2 CuO
With the exception of O2 ( gas), all reactants and products are solids at room temperature

Answer 4

1) Ag (No reaction unless heated)

2 Al + 6 HCl -> 2AlCl3 + 3 H2
Cu + 2HCl -> CuCl2 + H2

2) Ag2S, Al2O3, CuS or FeCuS2

3) Thermal reduction

4) 4 Fe + 3 O2 -> 2Fe2O3
2 Cu + O2 -> 2 CuO