Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 10>Q 2

EASY

Lower Secondary Stage 8

IMPORTANT

Earn 100

How many carbon and oxygen atoms are in one molecule of carbon dioxide $({CO}_{2})$ ?

Important Questions on Elements, Compounds and Mixtures

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 10>Q 3

A molecule of glucose has the formula

C_{6} H_{12} O_{6}

. What elements make up a glucose molecule?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 10>Q 3

A molecule of glucose has the formula

C_{6} H_{12} O_{6}

. How many of each atom are in one molecule of glucose?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 10>Q 4

The compound lithium oxide has the formula

{Li}_{2} O

. Which statement is correct?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 10>Q 5

The formula of magnesium chloride is

{MgCl}_{2}

. A piece of magnesium chloride contains

400

chlorine atoms. How many magnesium atoms are there?

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 11>Q 6

Describe how the properties of magnesium oxide are different to the elements it is made from.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 11>Q 7

A teacher heats together iron and sulphur. Iron sulphide is produced.

Name two elements mentioned.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 11>Q 7

A teacher heats together iron and sulphur. Iron sulphide is produced.

Name the compound.

EASY

Lower Secondary Stage 8

IMPORTANT

Cambridge Lower Secondary Science Stage 8 : Student's book>Chapter 4 - Elements, Compounds and Mixtures>Exercise 11>Q 7

A teacher heats together iron and sulphur. Iron sulphide is produced.

This is a chemical reaction. Explain what this means.