Look at this table of densities. Material Density in kg / m 3 Pure water (Liquid) 1000 Pure ice (Solid Water) 917 Seawater (liquid water with added salt and minerals) 1030 Wood (pine) 700 Is solid (frozen) pure water more dense or less dense than pure liquid water?

From the given table, we can see that the density of solid (frozen) pure water that is pure ice is 917 kg / m 3 and the density of pure liquid water is 1000 kg / m 3 . So, it is very much clear that ice is less dense than pure liquid water. This is why ice floats on water.

Look at this table of densities. Material Density in kg / m 3 Pure water (Liquid) 1000 Pure ice (Solid Water) 917 Seawater (liquid water with added salt and minerals) 1030 Wood (pine) 700 Ice floats on liquid water. Explain why this happens.

Some solid substances can float in water whereas some substances cannot. This is because of the density of the substances. If the density of the solid substance is less than water it will float and if the density of the solid substance is more than water it will sink. This is because, if water is denser than the substance then more particles that push up the substance than push it down and vice versa. The liquid water is denser than ice, so the particles that will push up the ice will be more than the particles pushing the ice down and thus the ice will float on liquid water.

Look at this table of densities. Material Density in kg / m 3 Pure water (Liquid) 1000 Pure ice (Solid Water) 917 Seawater (liquid water with added salt and minerals) 1030 Wood (pine) 700 Predict whether ice will float or sink in sea water. Explain your answer.

Some solid substances can float in water whereas some substances cannot. This is because of the density of the substances. If the density of the solid substance is less than water it will float and if the density of the solid substance is more than water it will sink. This is because, if water is denser than the substance then more particles that push up the substance push it down and vice versa. The seawater is denser than ice, so the particles that will push up the ice will be more than the particles pushing the ice down and thus the ice will float on seawater.

Look at this table of densities. Material Density in kg / m 3 Pure water (Liquid) 1000 Pure ice (Solid Water) 917 Seawater (liquid water with added salt and minerals) 1030 Wood (pine) 700 Explain by referring to density why wood is a good material to use to build a boat.

Some solid substances can float in water whereas some substances cannot. This is because of the density of the substances. If the density of the solid substance is less than water it will float and if the density of the solid substance is more than water it will sink. This is because, if water is denser than the substance then more particles that push up the substance push it down and vice versa. The water is more dense than wood, so the particles that will push up the wood will be more than the particles pushing the wood down and thus wood will float on water. This is the reason why wood is a good material to use to build a boat.

Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Moments, Pressure and Density, Exercise 4: Exercise 4

Author:Aiden Gill, Heidi Foxford & Dorothy Warren

Aiden Gill Science Solutions for Exercise - Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Moments, Pressure and Density, Exercise 4: Exercise 4

Attempt the practice questions on Chapter 10: Moments, Pressure and Density, Exercise 4: Exercise 4 with hints and solutions to strengthen your understanding. Cambridge Lower Secondary Science Stage 9: Workbook solutions are prepared by Experienced Embibe Experts.

Questions from Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Moments, Pressure and Density, Exercise 4: Exercise 4 with Hints & Solutions

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 3

The density of aluminium is $2.7 g / {cm}^{3}$ . Suggest why aluminium is used to build aircraft.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 5

You can rearrange the density equation to work out other quantities.

Fresh pure water has a density of $1.0 g / {cm}^{3}$ . A container filled to the top with pure water holds $2.0 litres$ . What is the mass of water in the container in kg?

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 5

You can rearrange the density equation to work out other quantities.

Air has a density of $1.2 kg / m^{3}$ . Calculate the mass of air in a $2.0 litre$ container.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 5

You can rearrange the density equation to work out other quantities.

Fresh pure water has a density of $1.0 g / {cm}^{3}$ . What is the volume of $1.0 tonne$ mass of pure water in $m^{3}$ ? $(1 tonne = 1000 kg)$

Write only the numerical value without any unit in the given box.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 6

Look at this table of densities.

Material	Density in $kg / m^{3}$
Pure water (Liquid)	$1000$
Pure ice (Solid Water)	$917$
Seawater (liquid water with added salt and minerals)	$1030$
Wood (pine)	$700$

Is solid (frozen) pure water more dense or less dense than pure liquid water?

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 6

Look at this table of densities.

Material	Density in $kg / m^{3}$
Pure water (Liquid)	$1000$
Pure ice (Solid Water)	$917$
Seawater (liquid water with added salt and minerals)	$1030$
Wood (pine)	$700$

Ice floats on liquid water. Explain why this happens.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 6

Look at this table of densities.

Material	Density in $kg / m^{3}$
Pure water (Liquid)	$1000$
Pure ice (Solid Water)	$917$
Seawater (liquid water with added salt and minerals)	$1030$
Wood (pine)	$700$

Predict whether ice will float or sink in sea water. Explain your answer.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 6

Look at this table of densities.

Material	Density in $kg / m^{3}$
Pure water (Liquid)	$1000$
Pure ice (Solid Water)	$917$
Seawater (liquid water with added salt and minerals)	$1030$
Wood (pine)	$700$

Explain by referring to density why wood is a good material to use to build a boat.

Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Moments, Pressure and Density, Exercise 4: Exercise 4

Aiden Gill Science Solutions for Exercise - Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Moments, Pressure and Density, Exercise 4: Exercise 4

Questions from Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Moments, Pressure and Density, Exercise 4: Exercise 4 with Hints & Solutions

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