The scientist John Dalton lived over 200 years ago - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2021 - Paper 1
Question 5
The scientist John Dalton lived over 200 years ago.
(a) John Dalton suggested an early model of atoms.
When Dalton first described atoms he said that
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Worked Solution & Example Answer:The scientist John Dalton lived over 200 years ago - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2021 - Paper 1
Step 1
Give two differences between Dalton's model of atoms and today's model of atoms.
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Answer
Dalton's model considered atoms as indivisible and indestructible, whereas today's model recognizes that atoms can be divided into subatomic particles (protons, neutrons, and electrons).
Dalton's model did not account for isotopes, which are atoms of the same element with different numbers of neutrons. In contrast, the modern atomic model incorporates isotopes.
Step 2
Give the molecular formula and the empirical formula of ethene.
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The molecular formula of ethene is C₂H₄.
The empirical formula of ethene is CH₂.
Step 3
Complete the balanced equation for this reaction, including the three missing state symbols.
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Cl₂(g) + H₂O(l) ⇌ HCl(aq) + HClO(aq)
Step 4
Give the formula of the ion in Figure 6 that causes the hydrogen chloride solution to be acidic.
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The formula of the ion is H⁺.
Step 5
Give the name of this type of reaction.
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This type of reaction is called a neutralization reaction.
Step 6
Describe what you would see when some copper carbonate powder is added to a beaker of dilute sulfuric acid.
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When copper carbonate is added to dilute sulfuric acid, a visible reaction occurs. Bubbles of carbon dioxide gas are produced, and the copper carbonate may appear to dissolve, leading to a color change in the solution due to the formation of copper sulfate.
