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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
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 ☐ B 1 ☐ C... show full transcript
Worked Solution & Example Answer:a) Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Step 1
Step 2
Explain how metals conduct electricity.
Answer
Metals conduct electricity due to the presence of delocalised electrons. These electrons are not fixed in place and can move freely throughout the metal structure. This movement allows electric current to flow when a voltage is applied, enabling the conduction of electricity.
Step 3
Step 4
Describe how silver nitrate solution can be used to show that solid sodium chloride contains chloride ions.
Answer
To demonstrate the presence of chloride ions in sodium chloride, firstly, make a solution of sodium chloride in water. Then, add dilute nitric acid followed by silver nitrate solution. If chloride ions are present, a white precipitate of silver chloride will form.
Step 5
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 conducted by combining solid sodium with chlorine gas in a controlled environment. When a sodium atom, which has one electron in its outer shell, comes into contact with a chlorine atom, which has seven electrons in its outer shell, a transfer occurs. Sodium donates its electron to chlorine, resulting in the formation of sodium ions (Na⁺) and chloride ions (Cl⁻). This process releases energy, and they bond together to form sodium chloride (NaCl), a stable ionic compound.