AP Chemistry Intermolecular Forces

Polarity of a molecule is determined by

• shape and charge

• shape and difference in EN value

• difference in EN value and size

• difference in EN value and charges

In a water molecule, the polar bond forms because

• the electrons spend most of their time near the hydrogen atom

• the electrons spend most of their time near the oxygen atom

• the protons spend most of their time near the hydrogen atom

• the protons spend most of their time near the oxygen atom

Tags

NGSS.MS-PS1-1

Arrange the boiling point of molecules from lowest to highest.

• lowest H₂ - N₂ - H₂O - CI₂ highest

• lowest H₂ - H₂O - N₂ - CI₂ highest

• lowest H₂ - N₂ - CI₂ - H₂O highest

• lowest H₂O - N₂ - H₂ - CI₂ highest

Tags

NGSS.MS-PS1-4

Intermolecular forces are the forces

• within molecules

• between molecules

In general, substances with stronger intermolecular forces have ________ boiling points than those with weaker forces

• Higher

• Lower

• The same

Which substance has the weakest intermolecular forces?

• Substance A, boiling point of 75 °C

• Substance B, boiling point of 105 °C

• Substance C, boiling point of 25 °C

• Substance d, boiling point of 45 °C

When Ice melts why does the temperature stay at zero for a while before increasing ?

• The particles must all reach the same temperature before the temperature can change.

• The hot plate wasn't turned on.

• The thermometer was not connected correctly.

• The kinetic energy was too high and the particles had to slow down.

Tags

NGSS.MS-PS1-4

What state/phase is the object likely from points A to B?

• Solid

• Liquid

• Gas

• Plasma

Tags

NGSS.MS-PS1-4

What is happening to the particles in the substance between points D and E?

• Melting

• Freezing

• Vaporizing

• Sublimating

Tags

NGSS.MS-PS1-4

Is the substance gaining or losing energy?

• Gaining

• Losing

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4