Physical States of Matter

We can Convert oC temperature to Kelvin temperature by adding ______.

• 273

• 373

• 473

• 573

A liquid boils when its vapour pressure becomes equal to.

• 760cm Hg

• 1 Pa

• o.1 atm

• 101.325 kPa

Some solids on heating change to vapours without passing through the liquid state. This process is called.

• sublimation

• evaporation

• vapour pressure

• Boiling point

Which statement about the particles of a solid is not correct?

• They move at great speeds

• They arranged in regular patterns

• There is a very little space between the particles.

• The forces of attraction between the particles are strong.

Acetone has characteristics fragrant odour and is used to make finger nail polish. It melts at – 94⁰C and boils at 56⁰C. What is the physical state of acetone at 25⁰C and 1atm?

• Gas

• liquid

• solid

• cannot be predicated

Bromine has a melting point of -7⁰C and a boiling point of 59⁰C. What is the physical state of bromine at 100⁰C?

• Gas

• liquid

• solid

• cannot be predicted

Which is not the property of crystalline solids?

• Have well defined shape

• Have orderly arrangements of particles

• Have repeating three dimensional arrangement of particles

• Are generally soft

Water normally boils at 100⁰C, but it is possible to boil water at room temperature. What variable would you have to change to do this:

• Increase external pressure

• Decrease external pressure

• Decrease temperature

• None of these