Two pieces of metal can be joined by welding them together - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Question 1
Two pieces of metal can be joined by welding them together.
(i) Complete the sentence by putting a cross (✗) in the box next to your answer.
The structure of a meta... show full transcript
Worked Solution & Example Answer:Two pieces of metal can be joined by welding them together - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The structure of a metal is a lattice of: C cations in a sea of electrons.
Step 2
State why a high temperature has to be used.
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Answer
Metals have a high melting point, which means a lot of energy is needed to break or overcome the metallic bonds.
Step 3
Explain why an atmosphere of argon is used.
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Answer
Argon is an inert gas, which prevents oxidation of the metal during the welding process. This ensures that the integrity of the weld is maintained without contamination.
Step 4
Write the balanced equation for this reaction.
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Answer
The balanced equation for the reaction of iron with bromine is:
ightarrow 2FeBr_3 $$
Step 5
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
At room temperature, iodine is a: B brown liquid.
Step 6
Use the information in the table to explain the order of reactivity of the three halogens.
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Answer
Chlorine and bromine do not displace chloride or bromide ions, respectively, but iodine does displace bromide ions. This indicates that iodine is less reactive than bromine and chlorine. Therefore, the order of reactivity is Chlorine > Bromine > Iodine.
