1 (a) (i) Suggest, in terms of the number of subatomic particles, why the atomic numbers of the three atoms are the same - AQA - GCSE Chemistry - Question 1 - 2017 - Paper 1
Question 1
1 (a) (i) Suggest, in terms of the number of subatomic particles, why the atomic numbers of the three atoms are the same.
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Worked Solution & Example Answer:1 (a) (i) Suggest, in terms of the number of subatomic particles, why the atomic numbers of the three atoms are the same - AQA - GCSE Chemistry - Question 1 - 2017 - Paper 1
Step 1
Suggest, in terms of the number of subatomic particles, why the atomic numbers of the three atoms are the same.
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Answer
The atomic numbers of the three atoms are the same because they all have the same number of protons. In this case, each atom contains 12 protons.
Step 2
Explain, in terms of the number of subatomic particles, why the mass numbers of the three atoms are different.
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Answer
The mass number is the total of protons and neutrons in an atom's nucleus. While the three atoms have the same number of protons (12), they differ in their neutron count, resulting in different mass numbers. For example:
Atom 1 has 12 neutrons (mass number 24).
Atom 2 has 13 neutrons (mass number 25).
Atom 3 has 14 neutrons (mass number 26).
Step 3
How many elements are in the formula H₂SO₄?
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Answer
There are 3 distinct elements in the formula H₂SO₄: hydrogen (H), sulfur (S), and oxygen (O).
Step 4
How many atoms are in the formula H₂SO₄?
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Answer
The formula H₂SO₄ contains a total of 7 atoms: 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.
Step 5
What is the mass of the products?
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Answer
The total mass of the products is 319 g (which includes 159 g of copper sulfate and 160 g of water).
Step 6
Describe and explain the changes seen during the reaction.
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Answer
During the reaction of sulfuric acid with copper carbonate, the following changes occur:
Color Change: The solution initially appears blue (due to copper carbonate) and may change to green or colorless as the copper carbonate dissolves, indicating a chemical change.
Bubble Formation: Effervescence is observed as carbon dioxide gas is produced.
Mass Decrease: The overall mass of the solid initially decreases as the copper carbonate dissolves and gas is released.
Final Product: At the end of the reaction, a new solution of copper sulfate is formed, which may be blue, along with the release of water.
