This question is about metals and metal compounds - AQA - GCSE Chemistry - Question 2 - 2018 - Paper 1
Question 2
This question is about metals and metal compounds.
Iron pyrites is an ionic compound.
Figure 1 shows a structure for iron pyrites.
Determine the formula of iron p... show full transcript
Worked Solution & Example Answer:This question is about metals and metal compounds - AQA - GCSE Chemistry - Question 2 - 2018 - Paper 1
Step 1
Determine the formula of iron pyrites.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The formula for iron pyrites is FeS2, indicating that there is one iron atom and two sulfur atoms in the compound.
Step 2
Number of protons
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The number of protons in the iron atom is 26.
Step 3
Number of neutrons
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The number of neutrons is 30, calculated as follows:
Number of neutrons = Mass number - Atomic number = 56 - 26 = 30.
Step 4
Number of electrons
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The number of electrons in a neutral atom of iron is also 26.
Step 5
Give two differences between the properties of iron and sodium.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Iron has a higher melting and boiling point compared to sodium.
Iron is denser than sodium, which affects their physical properties.
Step 6
Explain why carbon can be used to extract nickel from nickel oxide.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Carbon can be used to extract nickel because it is more reactive than nickel. It can displace nickel from nickel oxide by removing oxygen, as shown in the reaction:
NiO+C→Ni+CO
Step 7
Calculate the percentage atom economy for the reaction to produce nickel.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the percentage atom economy:
Total formula mass of reactants = 75 (for NiO) + 12 (for C) = 87.
Mass of nickel produced = 59.
