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.
When Dalton first described atoms he said that
- all elements are made of atoms
- atoms are not formed of any s... 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 are indivisible; however, today's model recognizes that atoms can be broken down into subatomic particles (protons, neutrons, and electrons).
Dalton's model did not account for isotopes, whereas the modern model acknowledges that atoms of the same element can have 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. Its empirical formula 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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You would see bubbles of gas being formed due to the release of carbon dioxide. Additionally, the blue color of copper carbonate would fade as it dissolves in the acid, forming copper sulfate, which is typically colorless.
