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Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Question 6
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: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 attached to any particular atom and can move freely throughout the metallic structure. When an electric voltage is applied, these electrons flow and carry an electric current.
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, first prepare a solution of sodium chloride by dissolving it in water. Then, add a few drops of dilute nitric acid to the solution to remove any carbonate ions. Finally, add silver nitrate solution to the resulting solution. A white precipitate of silver chloride will form if chloride ions are present.
Step 5
Describe how the reaction can be carried out, explaining what happens when a sodium atom reacts with a chlorine atom.
Answer
To carry out the reaction between sodium and chlorine, place a small piece of sodium in a petri dish and expose it to chlorine gas (this should be done in a fume hood due to the reactivity and potential hazards). Sodium will react vigorously with chlorine gas, forming sodium chloride. During this reaction, a sodium atom donates one electron to a chlorine atom. This electron transfer results in the formation of a sodium cation (Na⁺) and a chloride anion (Cl⁻). The resulting sodium chloride compound is formed through the electrostatic attraction between these oppositely charged ions.