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
- all elemen... show full transcript
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 suggested that atoms were indivisible, while today's model recognizes that atoms are composed of subatomic particles such as protons, neutrons, and electrons.
Dalton's model implied that all atoms of the same element are identical, whereas modern atomic theory acknowledges isotopes, which are variations of elements with different numbers of neutrons.
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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H⁺
Step 5
Give the name of this type of reaction.
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Neutralization.
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 powder is added to dilute sulfuric acid, a reaction occurs that produces bubbles of carbon dioxide gas, and the solid copper carbonate will start to dissolve, leading to the formation of a blue solution of copper sulfate.
