Unit 5: Gases, Acids/Bases, Solutions

A student has 3 beakers of 100 grams of water. In one beaker she puts 3 teaspoons of sugar. In the next she puts 2 teaspoons of sugar. In the last she puts 1 teaspoon of sugar. Which beaker will be the most concentrated?

• 1 teaspoon of sugar

• 2 teaspoons of sugar

• 3 teaspoons of sugar

• they will have the same concentration

The sugar in sweet tea would be considered the _______________ in the solution.

• solid

• solute

• solution

• solvent

If you taste a substance that tastes sour, the pH is probably...

• 0

• 7

• below 7

• above 7

Put the following items in order from highest pH to lowest pH.

baking soda, coke, water

• baking soda, water, coke

• coke, water, baking soda

• water, coke, baking soda

• water, baking soda, coke

Based on the chart, which of the acids would be the best conductor of electricity?

• HCl

• NH₃

• NaOH

• KOH

Which substances listed would turn a red litmus paper blue? (use scale)

• HCl

• Saliva

• Distilled water

• Bleach

If you test a substance that turns a blue litmus paper red, but doesn't change the color of the red litmus paper, what type of substance do you have?

• base

• neutral

• acid

• pH of 14

Which of the following will usually increase the rate that a substance dissolves?

• increase temperature

• stir

• smaller particles

• all of the above

Select all of the following that would be characteristics of a strong acid.

• Sour taste

• bitter taste

• strongly conducts electricity

• makes soap

• forms hydrogen ions

Select all of the following that would be characteristics of a strong base.

• Sour taste

• bitter taste

• strongly conducts electricity

• makes soap

• forms hydroxide (OH-) ions