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 (✗) 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 (✗) in the box next to your answer.
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Answer
The best answer is D, as argon is inert. This property makes it suitable for use in filament lamps because it does not react with the materials present, ensuring a longer lifespan for the lamp.
Step 2
Explain, in terms of their structures, why metals are malleable.
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Answer
Metals are malleable due to their atomic structure, which consists of a lattice of positively charged ions surrounded by a sea of delocalized electrons. This arrangement allows layers of metal atoms to slide over one another when force is applied, preventing the structure from breaking and allowing the metal to be shaped without fracturing.
Step 3
Calculate the empirical formula of the phosphorus bromide.
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Answer
First, we need to determine the number of moles of each element:
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 take the simplest ratio of moles:
For P: ( \frac{0.1}{0.1} = 1 )
For Br: ( \frac{0.3}{0.1} = 3 )
Therefore, the empirical formula for phosphorus bromide is PBr₃.
