Oquizy

What does the atomic number of an atom represent?

Number of electrons Number of neutrons Number of nucleons Number of protons

John says: “When water boils, the H–O bonds are broken.” Is he correct?

No, boiling breaks the particles themselves No, boiling overcomes intermolecular forces only Yes, atoms are separated when boiling Yes, boiling breaks chemical bonds

Xinyi is doing an experiment. A cotton wool soaked in concentrated hydrochloric acid is placed at one end of a glass tube and another soaked in ammonia at the other. A white ring forms closer to the HCl end. Why?

Ammonia particles are heavier Ammonia particles diffuse faster due to lower mass Hydrochloric acid particles move faster They react immediately upon release

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

Which statement explains why solids have a fixed shape?

Their particles are chemically bonded Their particles are far apart Their particles can only vibrate in fixed positions Their particles move freely in all directions

Quiz: Chemistry - The Particulate Nature Of Matter