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CBSE - Class 9 Science Matter in Our Surroundings Worksheet

Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations. (b) We can get the smell of perfume sitting several metres away.

Convert the following temperatures to the celsius scale. (a) 293 K

Convert the following temperatures to the kelvin scale. (b) $373^{\circ}$C

Which of the following materials fall in the category of a “pure substance”? (c) Iron

What is the physical state of water at— (b) $0^{\circ}$C ?

What is the physical state of water at— (a) $25^{\circ}$C ?

Convert the following temperatures to the kelvin scale. (a) $25^{\circ}$C

Why is ice at 273 K more effective in cooling than water at the same temperature?

10.

What produces more severe burns, boiling water or steam?

11.

What is the physical state of water at— (c) $100^{\circ}$C ?

12.

Give two reasons to justify— (b) an iron almirah is a solid at room temperature.

13.

Give two reasons to justify— (a) water at room temperature is a liquid.

14.

Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.

15.

Convert the following temperatures to the celsius scale. (b) 470 K

16.

Name A,B,C,D,E and F in the following diagram showing change in its state

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