L- 5 THE SCIENCE OF CHANGE

Answer the following questions

Q1. ‘Things around us are changing continuously.’ Justify the given statement.

Q2. How will you identify a change?

Q3. What bring about changes? Give 2 – 2 examples for each.

Q4. Broadly classify changes into different categories.

Q5. Explain how physical and chemical changes are useful in your daily life.

Q6. Can physical and chemical change occur simultaneously? Give one example other then the example given in the textbook.

Q7. Give reason:

a)      Rusting of Iron is chemical change.

b)      When urea is added to water, the beaker becomes cool.

Q8. Fill in the blanks

a)      Gases such as Oxygen and nitrogen under_______________ and ______ conditions turn into liquids.

b)      Fossil fuels are formed by _________ change.

c)      When we add baking soda to vinegar, it results in release of _______________.

d)      ____________ are the changes where the original form cannot be restored.

Q9. Identify and write the type of change

a)      Blackening of silver ornaments. ____________________

b)      Melting of wax.__________________

c)      Rotation of Moon around the Earth.________________

d)      Breaking of glass bowl._______________

e)      Photosynthesis.____________

f)       Cooking of vegetables.________________

g)      Making car from blocks._______________.