Question

Q:1 Make formula:
(a) Magnesium nitrate.
(b) Aluminium hydroxide.

Q:2 Write 3 points of difference each between Solid, Liquid and Gases.

Q:3 (a) Find the molecular mass of (a) Sugar (b) Water.

(b) Find the number of moles present in 17 grams of sodium chloride.

Q:4 Demonstrate an experiment to show : Effect of temperature on change of state.

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Answer 1

Answer:

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Answer 2

Answer:

Hope it helps.

Explanation:

1)(a)Mg(NO3)2

(b)Al(OH)3

2)Solid.

• They are incompressible. Liquids cannot be compressed. Gases can be compressed quite easily.
• Solids have a definite shape and volume.
• The force of attraction between the molecules is incredibly high.

Liquid.

• Liquids cannot be compressed
• Liquids have a definite volume.
• The force of attraction between the molecules is incredibly high.

Gas.

• Gases can be compressed quite easily.
• Gases have no definite volume
• The force of attraction between the molecules is incredibly high.

3)(a)342.2965 g/mol

(b)18.01528 g/mol

4)Lab manual. Ex-2.

BOILING POINT OF WATER AT CONSTANT TEPERATURE : Take some water in a beaker . suspend and clamp a thermometer in beaker in water so that bulb of thermometer remains in water without touching bottom and sides of beaker .supply heat by burner and note the temperature at room temperature (20oC) nearly.

Record the temperature after evefy minute . Temperature rises and as it reaches 100oC water starts boiling . though heat is being supplied temperature does not rises i.e. it remains constant at 100oC and bubles fromed are seen . thus , boiling point of water is 100oC and at boiling point heat supplied is absorbed by water at constant temperature . because this heart is being used to change every molecule of water into vapours.