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Matter in our surroundings

For any substance, why does the
temperature remain constant
during the change of state?

Matter in our surroundings

What is the physical state of
water at:
a. 250oC b. 100oC ?

Matter in our surroundings

Convert the following temperature
to celsius scale:
a. 300 K b. 573 K

Matter in our surroundings

What produces more severe burns, boiling water or steam?

Matter in our surroundings

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

Matter in our surroundings

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

Matter in our surroundings

What is the physical state of water at—
(a) 25 °C

(b) 0°C

(c) 100°C ?

Matter in our surroundings

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

Matter in our surroundings

Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving
any solid.
(b) We can get the smell of perfume sitting several metres
away.

Matter in our surroundings

Convert the following temperatures to the kelvin scale.
(a) 25°C

(b) 373°C