5 (a) The diagram shows the structure of diamond - Edexcel - GCSE Chemistry - Question 5 - 2014 - Paper 1
Question 5
5 (a) The diagram shows the structure of diamond.
(i) Describe what each ● represents.
(ii) State the type of bonding in the diamond structure.
(b) Give the name ... show full transcript
Worked Solution & Example Answer:5 (a) The diagram shows the structure of diamond - Edexcel - GCSE Chemistry - Question 5 - 2014 - Paper 1
Step 1
Describe what each ● represents.
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Answer
The ● represents a carbon atom. Each vertex of the structure in the diagram indicates a carbon atom within the diamond lattice.
Step 2
State the type of bonding in the diamond structure.
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Answer
The type of bonding in the diamond structure is covalent bonding.
Step 3
Give the name of the process used to obtain oxygen from liquid air.
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Answer
The process used to obtain oxygen from liquid air is fractional distillation.
Step 4
What is the Rf value of this dye?
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Answer
To calculate the Rf value, use the formula:
Rf=distancemovedbysolventdistancemovedbydye
Substituting the values, we have:
Rf=8cm2cm=0.25
Thus, the answer is A 0.25.
Step 5
Describe how the reaction can be carried out, including an explanation of what happens to the magnesium and oxygen atoms when they form magnesium oxide.
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Answer
To carry out the reaction, follow these steps:
Ignite Magnesium: Place a strip of magnesium ribbon in a Bunsen burner flame until it ignites, ensuring it has enough oxygen to react.
Oxidation Reaction: As magnesium burns, it reacts with oxygen in the air, forming magnesium oxide (MgO).
Chemical Change: In this reaction, each magnesium atom donates its two outer shell electrons to an oxygen atom, which accepts the electrons to complete its outer shell.
Ionic Compound Formation: The resulting magnesium ions (Mg²⁺) and oxide ions (O²⁻) attract each other to form magnesium oxide, an ionic compound. This process can be summarized as:
Magnesium: 2 electrons lost → Mg²⁺
Oxygen: 2 electrons gained → O²⁻
Visual Observation: The reaction produces a bright white flame and results in a white powder, which is solid magnesium oxide.
