4 Metals are extracted from substances naturally occurring in the Earth's crust - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 1
Question 4
4 Metals are extracted from substances naturally occurring in the Earth's crust.
(a) Which of these metals is usually found uncombined in the Earth's crust?
A ca... show full transcript
Worked Solution & Example Answer:4 Metals are extracted from substances naturally occurring in the Earth's crust - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 1
Step 1
Which of these metals is usually found uncombined in the Earth's crust?
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 only correct answer is B: gold. Calcium, iron, and magnesium are typically found chemically combined with other elements in the Earth's crust.
Step 2
Write the word equation for this reaction.
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 word equation for the reaction is:
zinc oxide + carbon → zinc + carbon dioxide
Step 3
State the type of reaction taking place when an oxide loses oxygen.
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 type of reaction taking place when an oxide loses oxygen is called reduction.
Step 4
Give the number of ions in the formula Al2O3.
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 formula Al2O3 consists of a total of 5 ions: 2 aluminum ions (Al³⁺) and 3 oxide ions (O²⁻).
Step 5
Complete the balanced equation for the overall reaction by putting numbers in the spaces.
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
The balanced equation for the overall reaction is:
2Al2O3 → 4Al + 3O2
Step 6
List the stages of the life-cycle assessment, using letters A, B, C, D, in the correct order from start to finish.
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
The correct order of stages in the life-cycle assessment is:
C (obtaining and processing the raw materials),
B (manufacturing the product),
D (using the product),
A (disposal of the product).
Step 7
Give two advantages of obtaining aluminium by recycling aluminium waste rather than mining the raw material.
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
Recycling aluminium significantly reduces energy consumption compared to mining and refining new aluminum, which conserves natural resources.
It reduces environmental impacts and pollution associated with mining operations, thus supporting sustainability.
