(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 of the process used to obtain oxygen from liquid air. (c) A colouring in some sweets was analysed using paper chromatography. One of the dyes in the colouring moved 2 cm up the paper while the solvent moved 8 cm. What is the Rf value of this dye? Put a cross (✗) in the box next to your answer. A 0.25 B 2 C 4 D 6 *d) Here is some information about magnesium, oxygen and magnesium oxide. The electronic configuration of magnesium atoms is 2.8.2 The electronic configuration of oxygen atoms is 2.6 Magnesium oxide is an ionic compound. When magnesium ribbon is heated, it reacts with oxygen from the air to form magnesium oxide, MgO. 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.

Photo AI

(a) The diagram shows the structure of diamond - Edexcel - GCSE Chemistry - Question 5 - 2014 - Paper 1

Question 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 of... show full transcript

Worked Solution & Example Answer:(a) The diagram shows the structure of diamond - Edexcel - GCSE Chemistry - Question 5 - 2014 - Paper 1

Step 1

Describe what each ● represents.

96%

114 rated

Answer

Each ● represents a carbon atom in the diamond structure. In a diamond, each carbon atom is tetrahedrally coordinated, meaning it bonds with four other carbon atoms, creating a strong and rigid three-dimensional network.

Step 2

State the type of bonding in the diamond structure.

99%

104 rated

Answer

The type of bonding in the diamond structure is covalent bonding, where each carbon atom shares electrons with four neighboring carbon atoms, resulting in a very strong structure.

Step 3

Give the name of the process used to obtain oxygen from liquid air.

96%

101 rated

Answer

The process used to obtain oxygen from liquid air is called fractional distillation.

Step 4

What is the Rf value of this dye?

98%

120 rated

Answer

The Rf value of the dye can be calculated using the formula:

$Rf = \frac{distance\ moved\ by\ dye}{distance\ moved\ by\ solvent}$

Substituting the values: $Rf = \frac{2\ cm}{8\ cm} = 0.25$

Therefore, the correct 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.

97%

117 rated

Answer

To carry out the reaction between magnesium and oxygen to form magnesium oxide (MgO), follow these steps:

Setting up the apparatus: Place a piece of magnesium ribbon in a heat-resistant dish (like a crucible) and ensure you have a Bunsen burner ready.
Igniting the magnesium: Using tongs, hold the magnesium ribbon and ignite it in a Bunsen flame. Be cautious as the reaction is highly exothermic and will emit bright white light.
Observing the reaction: Once the magnesium burns, it reacts with oxygen in the air, forming magnesium oxide, which appears as a white powder or solid.
Understanding the bonding: Magnesium atoms have 2 electrons in their outer shell and tend to lose these electrons to achieve a stable electron configuration. When magnesium burns in the presence of oxygen, it forms MgO by transferring its electrons to the oxygen atoms. Oxygen atoms have 6 electrons in their outer shell and need 2 more to complete it. Therefore, they gain 2 electrons from magnesium, forming Mg²⁺ ions and O²⁻ ions. These oppositely charged ions attract each other and form ionic bonds, resulting in magnesium oxide.

(a) The diagram shows the structure of diamond - Edexcel - GCSE Chemistry - Question 5 - 2014 - Paper 1

Worked Solution & Example Answer:(a) The diagram shows the structure of diamond - Edexcel - GCSE Chemistry - Question 5 - 2014 - Paper 1

Describe what each ● represents.

State the type of bonding in the diamond structure.

Give the name of the process used to obtain oxygen from liquid air.

What is the Rf value of this dye?

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.

Join the GCSE students using SimpleStudy...

Other GCSE Chemistry topics to explore