This question is about substances with covalent bonding - AQA - GCSE Chemistry: Combined Science - Question 2 - 2020 - Paper 1
Question 2
This question is about substances with covalent bonding.
02.1 Figure 2 shows a ball and stick model of a water molecule (H₂O).
Suggest one limitation of using a ba... show full transcript
Worked Solution & Example Answer:This question is about substances with covalent bonding - AQA - GCSE Chemistry: Combined Science - Question 2 - 2020 - Paper 1
Step 1
Suggest one limitation of using a ball and stick model for a water molecule.
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Answer
One limitation of using a ball and stick model for a water molecule is that it does not accurately represent the three-dimensional arrangement of atoms in space.
Step 2
Complete the sentence.
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Answer
Ice has a low melting point because the intermolecular forces are weak.
Step 3
What is the molecular formula of the molecule in Figure 3?
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Answer
The molecular formula of the molecule in Figure 3 is CH₄.
Step 4
What is the number of bonds formed by each carbon atom in diamond? Tick (✓) one box.
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Answer
✓ 4
Step 5
Give two physical properties of diamond.
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Answer
Diamond is very hard.
Diamond has a very high melting point.
Step 6
Name two other substances with giant covalent structures.
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Answer
Graphite
Silicon dioxide
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