Oquizy

A gas jar containing bromine vapour is placed above a jar of air. After some time, John sees the brown colour spreads downward. What explains this?

Bromine diffuses due to particle attraction Bromine dissolves into air due to heat Bromine particles are heavier, so they sink Bromine particles diffuse randomly into the air

What best describes the arrangement of particles in a gas?

Closely packed and fixed Closely packed but able to slide Far apart and move freely and rapidly Fixed and vibrate only

Which of the following best defines isotopes?

Atoms with different proton numbers Atoms with same number of electrons Atoms with the same proton number but different neutron numbers Ions of the same element

What is the number of neutrons in ³⁷₁₇Cl?

17 20 37 54

John says, “Solid particles don’t move at all.” Which statement best describes the motion of particles in a solid?

They are completely stationary They race around randomly in all directions They slide over one another They vibrate in fixed positions

An atom of fluorine has atomic number 9 and mass number 19. What are the subatomic particles in F⁻?

10p, 10n, 9e 9p, 10n, 10e 9p, 10n, 8e 9p, 9n, 10e

Quiz: Chemistry - The Particulate Nature Of Matter