Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 10: End of stage review

Author:Mark Levesley, Chris Meunier, Fran Eardley & Gemma Young

Mark Levesley Science Solutions for Exercise - Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 10: End of stage review

Attempt the practice questions from Exercise 10: End of stage review with hints and solutions to strengthen your understanding. Cambridge Lower Secondary Science Stage 7 : Student's Book solutions are prepared by Experienced Embibe Experts.

Questions from Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 10: End of stage review with Hints & Solutions

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 1

There are four layers of sedimentary rock in a cliff (figure given below). How can you tell that D is the oldest layer.

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EASY
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 2

A bottle in a laboratory has this symbol on the label. Why should you wear eye protection when using this substance.

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HARD
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 2

Scientists use indicators to decide whether a substance is an acid or an alkali.

A student used the following colour chart to test different liquids.

Indicator pH 1 pH 4 pH 7 pH 10 pH 13
Methyl orange Red Red Yellow Yellow Yellow
Phenolphthalein Colourless Colourless Colourless Pink Pink

Copy and complete the table to show the missing indicator colours.

  Colour in indicator
Substance Methyl orange Phenolphthalein
Lemon juice Red Colourless
Vinegar Red  
Bleach   Pink
Soap solution   Pink

HARD
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 2

Scientists use indicators to decide whether a substance is an acid or an alkali.

Indicator pH 1 pH 4 pH 7 pH 10 pH 13
Methyl orange Red Red Yellow Yellow Yellow
Phenolphthalein Colourless Colourless Colourless Pink Pink

A student used the above colour chart to test different liquids and tabulated the results as given below.

  Colour in indicator
Substance Methyl orange Phenolphthalein
Lemon juice Red Colourless
Vinegar Red Colourless
Bleach Yellow Pink
Soap solution Yellow Pink

Which substance in the table is the strongest acid?

HARD
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 2

Scientists use indicators to decide whether a substance is an acid or an alkali.

Indicator pH 1 pH 4 pH 7 pH 10 pH 13
Methyl orange Red Red Yellow Yellow Yellow
Phenolphthalein Colourless Colourless Colourless Pink Pink

A student used the above colour chart to test different liquids and tabulated the results as given below.

  Colour in indicator
Substance Methyl orange Phenolphthalein
Lemon juice Red Colourless
Vinegar Red Colourless
Bleach Yellow Pink
Soap solution Yellow Pink

What further test would you need to do to identify which substance is the strongest alkali?

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 3

Methane can exist in all three states of matter. Draw a diagram to show the arrangement of particles in methane when it is a gas.

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 4

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Usman buys a new saucepan. It is made of aluminium with a plastic handle.

Suggest and explain two reasons why aluminium was chosen for the pan.

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 7 - Acids and Alkalis>End of stage review>Q 4

Question Image 

Usman buys a new saucepan. It is made of aluminium with a plastic handle.

Suggest one reason why plastic was chosen for the handle.