AP Chemistry Unit 3

Which type of IMF is responsible for the attraction pictured above?

• Dipole-Dipole Interaction

• Ion-Dipole Interaction

• Hydrogen Bonds

• Covalent Bond

• Ionic Bond

Tags

NGSS.HS-PS2-4

Molecules that absorb infrared radiation undergo…

• bond vibrational movement.

• rotational movement.

• electron energy promotion (electron excitement).

Tags

SAP-8.C

When the volume of a gas decreases at constant temperature, what will happen to pressure?

• pressure increases due to increased kinetic energy of each gas particle

• pressure increases due to the smaller volume and more collisions with the sides of the container

• molecules collide less due to the pressure decrease due to smaller volume  of molecules

• pressure increases because molecules are moving faster due to the increase number of molecules

Which of the following is the best piece of laboratory glassware for preparing 500.0 mL of an aqueous solution of a solid?

• Volumetric flask

• Erlenmeyer flask

• Test tube

• Graduated beaker

• Graduated cylinder

Tags

SPQ-3.A

An ionic crystal is added to water and starts to dissolve as shown in the particulate representation above. Based on the orientation of the water molecules, what can be assumed about the charge of the hydrated particle indicated by the arrow?

• The particle is positively charged, because the oxygen atoms in water are attracted to it.

• The particle is negatively charged, because hydrogen atoms in water are attracted to it.

• The particle is both positively and negatively charged, because the water molecules are attracted to it.

• The particle is neutral, because the dipoles of the water molecules neutralize the charge of the particle.

Answer explanation

The oxygen atom of a water molecule has a partial negative charge due to oxygen’s greater electronegativity compared to hydrogen. The negative oxygen in H2O is attracted to positive particles (e.g., cations). The diagram shows the oxygen atoms of water molecules next to the particle indicated by the arrow, indicating that it has a positive charge.

Tags

SPQ-3.B

Which of the following pieces of laboratory glassware should be used to most accurately measure out a 25.00 mL sample of a solution?

• 5 mL pipet

• 25 mL pipet

• 25 mL beaker

• 25 mL Erlenmeyer flask

• 50 mL graduated cylinder

Tags

SPQ-3.A

Match the Following

• Polar Substances only

• Hydrogen Bond

• Present in Polar involving N, O, F

• London Dispersion Forces

• Present in both Polar and Non Polar Molecules

• Dipole- Dipole

Which of the following is associated with molecular rotation?

• UV-vis

• X-Ray

• Microwave

• Infrared

Which of the following is the strongest intermolecular force?

• hydrogen bonding

• dipole-dipole interactions

• London dispersion forces

• ionic bonds

Which of the following is most likely to be soluble in a nonpolar solvent?

• NaCl

• MgCl2

• C6H6

• CH2Cl2