Page 215 - New Medley 5 Semester 2

D. Classify the following into elements, compounds and mixtures.

Sugar Water Air Salt Iron Soil Carbon Gold
Hydrogen Baking Soda Soda Water Sea Water

Elements Compounds Mixtures

Think and Answer • Critical Thinking

1. Chemical changes are called permanent changes. Why?

2. Why do solids have a xed volume and xed shape?
3. We cannot see air but it is considered matter. Why?

Let Us Do S E L Self-Management • Hands-on Learning

Take two equal-sized glass bowls and keep 10 ice cubes in each of them. Add
8 spoons of salt in one of them and mix well. Keep both the bowls on a table and note

the time. Observe the bowls at intervals of 5 minutes each. Note down the time taken

in melting of ice cubes in both the bowls. Do you nd any di erence?

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