Activity 1.1 Class 10 Science

Table of Contents

Aim of the activity

To understand the burning of Magnesium and formation of magnesium oxide.

Materials used in the activity

Magnesium ribbon (2 cm in length)
Sand paper
Burner
Watch glass
Tongs

Procedure

Preparation

At first, we will take a 2 cm long magnesium ribbon and clean it with sand paper to remove any oxide layer over it.

Burning process

Now we hold it with a pair of tongs and burn using a burner for a while.

Observation

When magnesium ribbon is burnt in flame, it burns with white dazzling and a white powder or ash is obtained in watch glass.

Explanation

When magnesium ribbon is burnt, it undergoes a chemical reaction. Actually Magnesium (Mg) reacts with air (O₂) and form magnesium oxide which is white in colour.

Mg + O₂ →2MgO

Magnesium undergoes a combination reaction in which Mg combines with oxygen to form MgO.

So, through this reaction we can understand that during a chemical reaction, a new substance is formed.

It is also an oxidation reaction, as Oxygen is added to magnesium.

Conclusion

It is clear that Mg burns and changes into a new substance of new state, which is magnesium oxide (MgO).

MgO is formed by the reaction of magnesium with oxygen present in air.

Safety measures

It would be better if student’s wear eye protection.
Do not hold magnesium ribbon with hands, use tongs.
Perform activity in the assistance of teacher.

Significance of activity

This activity demonstrates a chemical reaction. The students can observe and analyze the changes in matter during the reaction.

What can a student explore more through this activity

Student can measure the amount of magnesium oxide formed during this activity.
Student can compare the chemical and physical properties of magnesium and magnesium oxide.

Questions based on the activity

Why is magnesium ribbon cleaned before burring?

Ans – Magnesium ribbon is cleaned before burning because it has a oxide layer on it. That’s why it is cleaned with sand paper.

What is chemical name and formula of product formed during the activity 1.1?

Ans- Chemical name – Magnesium oxide

Chemical formula – MgO

Name the chemical reactions takes place when magnesium ribbon is burnt?

Ans – It is combination reaction. Magnesium combines with oxygen to form magnesium oxide.

Write the equation for the chemical reaction takes place.

Ans – Mg + O₂ →2MgO

What is the colour of ash collected in watch glass during the activity?

Ans – White