Chemistry
Fill in the blanks:
(a) The change of a solid into a liquid is called …………… .
(b) The process in which a solid directly changes into gas is called …………… .
(c) The change of water vapour into water is called …………… .
(d) The temperature at which a liquid starts changing into its vapour state is …………… .
(e) A gas can be changed into a liquid and then into solid by ............... its pressure and cooling .
(f) LPG cylinders contain cooking gas in ............... state at high pressure.
(g) In a chemical reaction, the total mass of the reactants is ............... to the total mass of the products.
Matter
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Answer
(a) Melting
(b) Sublimation
(c) Condensation
(d) Boiling point
(e)increasing
(f) liquid
(g) equal
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Related Questions
Assertion (A): Conversion of a substance in solid state to its liquid state is called melting.
Reason (R): On heating, the kinetic energy of solid molecules increases.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Solids can be hardly compressed by applying pressure.
Reason (R): The molecules in solids are closely packed.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Write whether the following statements are true or false.
(a) Matter can be created or destroyed during a chemical reaction.
(b) When a substance changes its state, its mass is also changed.
(c) In solids, the molecules can only vibrate about their mean positions. They are not free to move.
(d) In liquids, the kinetic energy of molecules is less than that of solids.
(e) In gases, the intermolecular forces of attraction are negligible.
Match the following:
Column A Column B (a) Smallest inter-molecular spaces (i) Diffusion (b) Random motion of particles in a liquid (ii) Gases (c) Intermixing of gaseous molecules (iii) Intermolecular force of attraction (d) Highest kinetic energy (iv) Brownian motion (e) Increases with a decrease in temperature (v) Solids