Mrs Brown’s class were investigating how the mass of magnesium changes when it burns. Write a word equation for the reaction.

Magnesium burns in the presence of oxygen with a white dazzling light to form magnesium oxide. It is an exothermic reaction as it produces heat and light. The word equation for the reaction is as follows: magnesium + oxygen → magnesium oxide

Mrs Brown’s class were investigating how the mass of magnesium changes when it burns. At the end of the experiment, they collected the results together in a table. Group Mass of magnesium in the starting Mass of magnesium at the end 1 0 . 51 0 . 65 2 0 . 52 0 . 72 3 0 . 50 0 . 35 4 0 . 51 0 . 75 State what is missing from the table.

Magnesium burns in the presence of oxygen with a white dazzling light to form magnesium oxide. It is an exothermic reaction as it produces heat and light. The word equation for the reaction is as follows: magnesium + oxygen → magnesium oxide The data in the table shows only the mass of magnesium before and after the reaction. It doesn't show the mass of oxygen which is reacted with the metal.

Mrs Brown’s class were investigating how the mass of magnesium changes when it burns. At the end of the experiment, they collected the results together in a table. Group Mass of magnesium in the starting Mass of magnesium at the end 1 0 . 51 0 . 65 2 0 . 52 0 . 72 3 0 . 50 0 . 35 4 0 . 51 0 . 75 Explain which group’s result was unexpected. Give a reason for your answer.

Magnesium burns in the presence of oxygen with a white dazzling light to form magnesium oxide. Since it is a combination reaction of magnesium with the oxygen present in the air, the mass of the resultant product is supposed to be greater than the metal used. From the given data it is clear that the result of group 3 is unexpected which shows that the mass of the product is decreased on the reaction of metal with oxygen.

Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Chemical Reactions, Exercise 5: Test-style questions

Author:Aidan Gill, Heidi Foxford & Dorothy Warren

Aidan Gill Science Solutions for Exercise - Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Chemical Reactions, Exercise 5: Test-style questions

Attempt the practice questions on Chapter 6: Chemical Reactions, Exercise 5: Test-style questions with hints and solutions to strengthen your understanding. Cambridge Lower Secondary Science Stage 8 : Workbook solutions are prepared by Experienced Embibe Experts.

Questions from Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Chemical Reactions, Exercise 5: Test-style questions with Hints & Solutions

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 2

Mrs Brown’s class were investigating how the mass of magnesium changes when it burns.

Write a word equation for the reaction.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 2

Mrs Brown’s class were investigating how the mass of magnesium changes when it burns.

At the end of the experiment, they collected the results together in a table.

Group	Mass of magnesium in the starting	Mass of magnesium at the end
$1$	$0.51$	$0.65$
$2$	$0.52$	$0.72$
$3$	$0.50$	$0.35$
$4$	$0.51$	$0.75$

State what is missing from the table.

HARD

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 2

Mrs Brown’s class were investigating how the mass of magnesium changes when it burns.

At the end of the experiment, they collected the results together in a table.

Group	Mass of magnesium in the starting	Mass of magnesium at the end
$1$	$0.51$	$0.65$
$2$	$0.52$	$0.72$
$3$	$0.50$	$0.35$
$4$	$0.51$	$0.75$

Explain which group’s result was unexpected. Give a reason for your answer.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 3

Many pollutants are formed during the combustion of carbon-containing fuels.

A sample of coal contains $C, H$ and $S$ atoms. Which air pollutant is not formed by the combustion of coal?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 3

Many pollutants are formed during the combustion of carbon-containing fuels. A sample of coal contains $C, H$ and $S$ atoms.

Write a word equation for the formation of sulphur dioxide.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 3

When sulphur dioxide dissolves in rain water the rain becomes acidic. Describe why this might be a problem?

HARD

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 3

This graph shows how global temperatures have changed over the past $1000$ years.

Look at the data in the graph.

Question Image

Describe what the graph shows.

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 6 - Chemical Reactions>Test-style questions>Q 3

Carbon dioxide is a greenhouse gas. Explain why some scientists think that the burning of carbon fuels has caused the temperature changes seen in the graph. Include a word equation in your answer.

Question Image

Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Chemical Reactions, Exercise 5: Test-style questions

Aidan Gill Science Solutions for Exercise - Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Chemical Reactions, Exercise 5: Test-style questions

Questions from Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Chemical Reactions, Exercise 5: Test-style questions with Hints & Solutions

Learn and Prepare for any exam you want !