Mixtures, Solutions, Acids, & Bases

When dissolved in water, an acid or a base breaks down into

• a proton and an electron.

• two negative ions.

• a positive and a negative ion.

• a positive ion and a proton.

Which is a strong base?

• HCl

• NaOH

• NH₃

• H₃CO₃

A solution has a pH of 2. Which best describes the solution?

• a strong acid

• a strong base

• a neutral solution

• a weak base

The equation shows a neutralization reaction.

H₂SO₄ + 2NaOH Na₂SO₄ + 2H₂O

What is Na₂SO₄?

• an acid

• a base

• a salt

• an ion

Tags

NGSS.MS-PS1-1

What ion do acids release in solution?

• hydrogen

• hydroxide

• carbonate

• ammonium

Which substance is a base?

• HCOOH

• RbOH

• H₂CO₃

• NaNO₃

Which acid is naturally found in foods and can be safe to eat?

• sulfuric acid

• citric acid

• hydrochloric acid

• nitric acid

Which substance is used in lotions and cosmetics?

• ammonium hydroxide

• acetic acid

• formic acid

• zinc hydroxide

Which best describes solubility?

• the speed at which a substance dissolves

• the ability of one substance to dissolve in another

• the amount of surface area per a given mass

• the temperature at which substances become a mixture

Guy needs a 75% concentrated solution. When making his solution at room temperature, he could only make a solution that was 70% before the solute settled out.

What could he do to make his solution reach 75%?

• Put the solution in an ice bath, dissolve the solute, and let it return to room temperature.

• Heat the solution, dissolve the solute, and let it cool verifying nothing settled out.

• Add more water, boil the solution, and dissolve the solute until the some of the water evaporates.

• Keep the solution at room temperature, add more water, and dissolve the excess solute.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4