Mia and Ahmed heated a mixture of iron and sulphur using the equipment below. Why did they add mineral wool to the end of the test tube ?

When a mixture of Iron and Sulphur is heated, the sulphur melts and reacts with the iron exothermically to form iron(II) sulphide. The mineral wool plug in the mouth of the test tube prevents sulphur vapour from escaping and possibly catching fire.

Mia and Ahmed heated a mixture of iron and sulphur using the equipment below. What could they do to reduce the risk in this experiment ?

To reduce the risk in the experiment we can follow some steps: Step 1: We must use a Bunsen burner in adult supervision. Step 2: Since it is a highly exothermic reaction so must wear eyeglasses and gloves while doing the experiment. When Iron reacts with sulphur, it forms a new compound called Iron(II)Sulphide ( FeS ) .

E M B I B E

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4

Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Elements, Compounds and Mixtures, Exercise 4: Exercise 4

Author:Aidan Gill, Heidi Foxford & Dorothy Warren

Aidan Gill Science Solutions for Exercise - Aidan Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Elements, Compounds and Mixtures, Exercise 4: Exercise 4

Attempt the free practice questions on Chapter 4: Elements, Compounds and Mixtures, Exercise 4: Exercise 4 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: Elements, Compounds and Mixtures, Exercise 4: Exercise 4 with Hints & Solutions

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 1

Draw a line to match the keyword (s) to its diagram.

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MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 3

Name the elements present in the compound Sodium Chloride.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 4

What is the formula of Copper Carbonate?

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MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 6

Mia and Ahmed heated a mixture of iron and sulphur using the equipment below.
Question Image
Why did they add mineral wool to the end of the test tube ?

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 6

Mia and Ahmed heated a mixture of iron and sulphur using the equipment below.
Question Image
What could they do to reduce the risk in this experiment ?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 7

Copper sulphate and diamond both form crystals.
The formula of copper sulphate is ${CuSO}_{4} . 5 H_{2} O$
The formula of diamond is $C$ .
Why is copper sulphate a compound and diamond an element ?

MEDIUM

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 4 - Elements, Compounds and Mixtures>Exercise 4>Q 8

Ershad and Pramod were heating copper metal using a Bunsen burner. At the end of the experiment, they noticed that the copper had gone black. Ershad thinks that the metal is covered in shoot but Pramod disagrees.

Explain why Ershad is wrong.

Learn and Prepare for any exam you want !

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