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Identify the substance used to reduce titanium(IV) chloride to titanium.
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The reduction of titanium(IV) chloride to titanium cannot be carried out in air.
The air has to be replaced with argon gas. Explain why
The air has to be replaced with argon gas. Explain why
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chemistry
A1
| Question | Answer |
|---|---|
| Identify the substance used to reduce titanium(IV) chloride to titanium. | magnesium |
| The reduction of titanium(IV) chloride to titanium cannot be carried out in air. The air has to be replaced with argon gas. Explain why | there is oxygen, nitrogen and water in the air, their presence will make titanium brittle. |
| Two advantages of electrolysis are that it is quicker and can be run continuously. Give two other reasons why electrolysis would be a more efficient method of extraction than the Kroll process. | has lower energy requirements, will give a purer product. |
| Complete and balance the chemical equation for the reaction of calcium hydroxide with sulfuric acid. (State symbols are not required.) | |
| Compare the similarities and differences between the extraction of aluminium and the extraction of chlorine by electrolysis. | similarities-ions free to move in both compounds elements formed at both anode and cathode use electricity to decompose compounds diffrences -alumnia is a liquid while brine is an aqueos soulotion electroylsis of brine requires less energy that brine |
| When brine is electrolysed, three useful products are formed: hydrogen, chlorine and sodium hydroxide. Describe where each product is formed during the electrolysis of brine. | hydrogen is formed atathode and ion go to cathode chlorine ions form at anode and ions go to anode sodium hydroxide is left behind in the solution |
| Explain how a transition metal works as a catalyst. | speeds up reaction provides a surface for reaction to take place provides an alternative pathway |
| Explain how alumina is extracted and purified from bauxite. You may include equations in your answer. | bayer process is used bauxite cushed the reacted with sodium hydroixed to produce sodium alumiate filter out solid imputies and crystilize to form alumium hydroixed heat rotary kiln to ptoduce alumina |
| Explain how the diaphragm cell is used to produce sodium hydroxide, chlorine and hydrogen. | |
| Explain the effect of using a catalyst in the Haber process | |
| Explain the function of the membrane in the cell | |
| Explain why alumina must be dissolved before electrolysis can take place. | |
| Give two reasons why the electrolysis of alumina is expensive. | |
| Explain why manganese (IV) oxide can act as a catalyst. |
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aishamselem01