Solutions Review

You add 0.5 moles of HCl to 2 L of water. What's the concentration of the solution you made?

• 0.25 mol/L

• 4.5 mol/L

• 1 mol/L

• 4 mol/L

Tags

NGSS.HS-PS1-5

You have a 9 M stock solution of Sodium Hydroxide, but you need 15 L of 0.03 M solution. How much stock solution should you start with?

• 0.05 L

• 0.05 M

• 135 L

• 135 M

Tags

NGSS.HS-PS1-7

The earth's ice caps are melting, adding fresh liquid water to the ocean. What happens to the concentration of salt in the world's ocean as the ice caps melt?

• The concentration of salt increases.

• The concentration of salt decreases.

• The concentration of salt stays the same.

Tags

NGSS.HS-ESS2-2

NGSS.HS-ESS3-5

As carbon dioxide dissolves into the surface of the ocean, it turns into carbonic acid. What is happening to the pH of the ocean as the world's climate changes?

• The ocean's pH is rising

• The ocean's pH is falling

• The ocean's pH is staying the same

Tags

NGSS.HS-ESS2-6

This burger has been sitting in concentrated hydrochloric acid (HCl), which ripped apart most of the molecules in its lower half. Which ion do you think did most of the damage?

• H⁺

• Cl^-

• Na⁺

• OH^-

You have a pot containing 3 Liters of water and a salt concentration of 0.005 mol/L. Once you boil off 1 Liter of the water, what's your final concentration?

• 0 mol/L

• 0.015 mol/L

• 0.005 mol/L

• 0.0075 mol/L

You're trying to dissolve a solid ionic compound in a liquid solvent. Which of these is NOT something you can do to make it dissolve faster?

• Heat up the liquid.

• Grind the solid into a powder.

• Stir the mixture as the solid is dissolving.

• Add some salt to the solvent before mixing in the other solid.

Tags

NGSS.HS-PS3-4

Which of these will INCREASE the concentration of a solution if you add it to a sample?

• Solute

• Solvent

• Solution

You have 25 mL of window cleaner (0.15 M solution of NH₃) and add water until the volume is 100 mL. What's the new concentration of ammonia in your solution?

• 0.25 mL

• 4 mL

• 0.0375 M

• 3.75 M

Tags

NGSS.HS-PS1-5

Find the pH of the Hydrochloric acid in your stomach. Its concentration is about 0.01 mol/L.

• pH = 0

• pH = 1

• pH = 2

• pH = 3