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6. a) Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Question 6
6. a) Complete the sentence by putting a cross (✗) in the box next to your answer. Sodium is an alkali metal. In the periodic table, sodium is in group ☐ A 0... show full transcript
Worked Solution & Example Answer:6. a) Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
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b) Explain how metals conduct electricity.
Answer
Metals conduct electricity due to the presence of delocalised electrons. These electrons are not bound to any particular atom and can move freely throughout the metal's structure. When an electric field is applied, these electrons move towards the positive side, allowing for the conduction of electricity.
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c) (ii) Describe how silver nitrate solution can be used to show that solid sodium chloride contains chloride ions.
Answer
To test for chloride ions, first make a solution of sodium chloride by dissolving it in water. Then, add dilute nitric acid to eliminate any interfering ions. Next, add silver nitrate solution. A white precipitate, which is silver chloride, will indicate the presence of chloride ions.
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c) (iii) Describe how the reaction can be carried out, explaining what happens when a sodium atom reacts with a chlorine atom.
Answer
The reaction between sodium and chlorine can be carried out by placing a piece of sodium in a controlled environment with chlorine gas. Upon reaction, a vigorous exothermic reaction occurs, with sodium donating an electron to a chlorine atom. This forms a sodium ion (Na+) and a chloride ion (Cl−), resulting in the formation of sodium chloride (NaCl). The equation for the reaction is:
ightarrow 2 ext{NaCl (s)}$$