Class 5 Science Lesson 6

Exercise – 1 (Mixture)

1. If the statement given below is correct, put a tick mark (✓) and if it is wrong, put a cross mark (✗):

(a) Matter occupies space.  ✓

(b) A liquid has a definite shape.  ✗

(c) Gas is a compressible substance.  ✓

(d) Heat changes the state of matter. ✓

(e) Heat is not required to melt ice.  ✗

2. Fill in the blanks in the sentences below by choosing the appropriate word:

(a) Matter exists in three states.

(b) Heat changes the state of matter.

(c) Solid and liquid substances cannot be compressed.

(d) The state of matter having definite shape and volume is the solid.

(e) Camphor changes to gas when heated.

3. Choose the correct option for the question given below:

(a) Which effect of heat allows us to make new plastic products from used plastics?
👉 ii. the property by which heat can change the state of matter

(b) In how many states can matter generally exist?
👉 i. three

(c) What would you do if you had to open a tightly sealed glass bottle?
👉  ii. open by heating it

(d) Which of the following is a negative effect of heat?

👉 iii. decomposition of food substances due to heat

(e) Which of the following substances can flow?

👉 B. liquids and gases

4. Write the answers to the following questions:

(a) What is matter?

👉 Matter is anything that has mass and occupies space.

(b) Write three differences between solid and liquid.
👉

Solid has a fixed shape, but liquid does not.

Solid cannot flow, but liquid can flow.

Solid cannot be compressed, and liquid also cannot be compressed easily, but they behave differently when placed in containers.

(c) Why is air called a gaseous substance?

👉 Air is called a gaseous substance because it has no definite shape or volume, can be compressed, and flows easily.

(d) Write the reason why heat and light are not considered matter.

👉 Heat and light are not considered matter because they do not have mass and do not occupy space.

(e) Can the state of the matter be changed? How? Give examples.

👉 Yes, the state of matter can be changed by heating or cooling. For example, ice melts into water, and water boils into steam when heated.

(f) Water turns into steam when it boils. Represent this process in a diagram so that the particles of matter are clear.

👉 (Draw a diagram showing closely packed particles in liquid water changing into widely spread particles in steam/gas)

(g) Have you seen used plastic bags being collected? Why are they collected?

👉 Yes, used plastic bags are collected because they can be melted and reshaped to make new plastic products.

Exercise -2 (Mixture)

1. If the statement given below is correct, put a tick mark (✓) and if it is wrong, put a cross mark (✗):

(a) A new substance made up of two or more physical substances is called a mixture. ✓

(b) Salt water is a homogeneous mixture.  ✓

(c) Coca-Cola is a mixture of liquid and liquid.  ✗ (It is liquid and gas)

(d) Turbid water can be separated by filtration.  ✓

(e) If stones are mixed with beaten rice, they can be removed by hand. ✓

2. Fill in the blanks in the sentences given below by choosing the appropriate word:

(a) The substance mixed in a mixture is known as component of the mixture.

(b) If the components of a mixture can be seen with the naked eye, the mixture is called heterogeneous mixture.

(c) Sand and water can be separated by the method of filtration.

(d) To separate the mixture of heavy and light substances winnowing method is used.

(e) Sugar water solution is an example of homogeneous mixture.

3. Choose the correct option for the questions given below:

(a) In which of the following mixtures are all the components solids?

👉  iii. dalmoth

(b) Which of the following mixtures can be seen with the naked eye?

👉 iii. soil and water

(c) Which method is better to follow before collecting water if you get dirty water in the tap?

👉  ii. filtration

(d) Which of the following options would you take to make a homogeneous mixture?

👉  iii. water and vinegar

(e) What kind of mixture is air?

👉 iv. mixture of gas and gas

4. Write the answers to the following questions:

(a) What is a mixture?

👉 A mixture is a combination of two or more substances that are physically combined.

(b) Write the difference between a homogeneous mixture and a heterogeneous mixture.

👉 A homogeneous mixture has evenly mixed components that cannot be seen with the naked eye. A heterogeneous mixture has unevenly mixed components that can be seen with the naked eye.

(c) Why is air called a gas and a mixture of gas?

👉 Air is called a gas because it has no definite shape or volume, and it is a mixture of gases like oxygen, nitrogen, carbon dioxide, etc.

(d) As soon as Biju opened the Coca-Cola bottle, fizz came out. Why did this happen?

👉 The fizz came out because carbon dioxide gas was dissolved in the liquid under pressure, and it escaped when the bottle was opened.

(e) Ramila mixed sand in the drinking water by mistake. She was afraid that her mother would scold her. What advice would you give her after reading the method of separating the mixtures?

👉 I would advise Ramila to separate the sand from the water using the filtration method to make the water clean again.