AP Chemistry

2.45 mole of LiBr is dissolved to make a 0.750 L of solution. What is the molarity?

• 3.27 M

• 0.306 M

• 0.0376 M

2.92 g of NaCl is dissolved to make a 750.0 ml solution. What is the molarity?

• 2.93 M

• 0.066 M

• 5.02 x 10^-5 M

What volume, in milliliters, of 10.0 M NaOH is needed to prepare 300.0 mL of 2.00 M NaOH by dilution?

• 0.067 mL

• 60.0 mL

• 100 mL

• 125 mL

If I have 150.0 mL of a 0.500 M NaBr solution, what will the concentration be if I add 750.0 mL more water to it? (Remember to use the total new volume)

• .083 M

• 3.78 M

• .389 M

• 1.76 M

Given your knowledge of the Lewis structure for H₂O, which is most likely to be the blue sphere at the center?

• Calcium Ion

• Sulfide Ion

• Pure Carbon Atom

• Hexane

Tags

NGSS.HS-PS1-3

If the ion at the center was Fluoride, how would this depiction change?

• There would be no change

• There would be twice as many water molecules

• The water molecules would flip around

• There would be half as many water molecules

Tags

NGSS.HS-PS1-2

Ink can be separated by a method of -----------------------------------------------

• distillation

• filtration

• chromatography

• sedimentation

chromatography separates the mixture of dyes on the basis of their ----------------------------

• density
• solubility
• gravity
• boiling point

On the chromatogram given -------------- is a mixture.

• red

• orange

• green

• black

Distillation is used to separate ______.

• a liquid from its solution.

• an insoluble solid from its solution.

• a soluble solid from its solution.