EduNinja

IGCSE Chemistry2.11 Combustion productsTopic Practice

2.11 Combustion products

Describe the combustion of elements in oxygen, including magnesium, hydrogen and sulfur

Question 1(b)(i)

[Maximum number: 1]

This question is about gases in the atmosphere.

Sulfur reacts with oxygen to produce sulfur dioxide gas.

Write a chemical equation for this reaction.

Question 2(a)(iii)

[Maximum number: 1]

The box gives the names of some gases in the atmosphere.

Table

Choose gases from the box to answer these questions.

Identify the gas needed for combustion reactions.

Question 2(a)(i)

[Maximum number: 1]

This question is about gases in the atmosphere.
A teacher uses this apparatus to determine the percentage of oxygen in air.

Question image

The teacher removes the stopper, ignites the magnesium ribbon and immediately replaces the stopper.

The magnesium reacts with oxygen to form magnesium oxide.
During the reaction the water level in the bell jar rises.
When the flame goes out, some magnesium remains in the basin.

Give the appearance of the magnesium oxide.

Question 2(a)(i)

[Maximum number: 1]

The table gives some information about five gases.

Table

Use gases from the table to answer these questions.

You may use each gas once, more than once or not at all.

Name the gas needed for combustion.

Question 4(a)

[Maximum number: 2]

This question is about magnesium and magnesium compounds.

Magnesium burns in oxygen to form magnesium oxide.

State two observations that would be seen during the reaction.

1
2

Question 5(c)(i)

[Maximum number: 1]

This is a question about metals and their compounds.

Magnesium is a metal that burns in air.

State one observation made during the combustion of magnesium metal.

Question 7(a)

[Maximum number: 2]

A teacher ignites a piece of magnesium ribbon and places it in a gas jar of oxygen.
This is the equation for the reaction.

2Mg+O2→2MgO2 \mathrm{Mg}+\mathrm{O}_{2} \rightarrow 2 \mathrm{MgO}

Give two observations that would be made during this reaction.

1

2

Question 8

Question 8(a)

(a)

A piece of magnesium ribbon is ignited and placed in a gas jar of oxygen.
The equation for the reaction is

2Mg+O2→2MgO2 \mathrm{Mg}+\mathrm{O}_{2} \rightarrow 2 \mathrm{MgO}
[ 2 ]

Question 8(a)(i)

(i)

Give two observations that would be made in this reaction.

1

2

[ 2 ]

Question 8(b)

(b)

A second piece of magnesium ribbon is ignited and placed in a gas jar of carbon dioxide.

A very exothermic reaction occurs, forming magnesium oxide and carbon.

[ 1 ]

Question 8(b)(iii)

(i)

A fire starts in a warehouse where magnesium is stored.

Suggest why it would not be suitable to use a carbon dioxide fire extinguisher to put out this fire.

[ 1 ]
0 selected