5
(a) Argon is an element in Group 0 of the periodic table - Edexcel - GCSE Chemistry - Question 5 - 2015 - Paper 1
Question 5
5
(a) Argon is an element in Group 0 of the periodic table.
It is used as the gas in filament lamps.
Complete the sentence by putting a cross (X) in the box next t... show full transcript
Worked Solution & Example Answer:5
(a) Argon is an element in Group 0 of the periodic table - Edexcel - GCSE Chemistry - Question 5 - 2015 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is D: Argon is inert. This means it does not react with the filament, providing a stable environment.
Step 2
Explain, in terms of their structures, why metals are malleable.
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Answer
Metals are malleable because their structure consists of layers of atoms that can slide over each other. When a force is applied, these layers can move without breaking the metallic bonds, allowing the metal to be shaped without fracturing.
Step 3
Calculate the empirical formula of the phosphorus bromide.
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Answer
To find the empirical formula, first, we need to calculate the moles of phosphorus and bromine:
Moles of phosphorus (P):
Moles of P=31 g/mol3.1 g=0.1 mol
Moles of bromine (Br):
Moles of Br=80 g/mol24 g=0.3 mol
Next, we find the simplest mole ratio:
Ratio of P: ( \frac{0.1}{0.1} = 1 )
Ratio of Br: ( \frac{0.3}{0.1} = 3 )
Thus, the empirical formula of phosphorus bromide is PBr₃.
