 |
| 1 | |
What is a pH scale? |
| | A) | A pH scale is a numerical scale that is used to classify aqueous solutions as either acidic or basic. |
| | B) | A pH scale is a numerical scale that is used to classify aqueous solutions as acidic, basic, or neutral. |
| | C) | A pH scale is a numerical scale that is used to classify gases as either acidic or basic. |
| | D) | A pH scale is a numerical scale that is used to classify gases as acidic, basic, or neutral. |
|
|
|
| 2 | |
What is the classification of a solution with a pH level of zero? |
| | A) | neutral |
| | B) | basic |
| | C) | acidic |
| | D) | No solution can have a pH level of exactly zero, because the pH scale begins at level one and ranges to 14. |
|
|
|
| 3 | |
Milk has a pH of six, while lemons have a pH of two. What does this tell you about the relationship between these two substances? |
| | A) | Milk is more acidic than lemons. |
| | B) | Lemons are more acidic than milk. |
| | C) | The concentration of hydroxide ions in milk is five times greater than in lemons. |
| | D) | The concentration of hydroxide ions in lemons is five times greater than in milk. |
|
|
|
| 4 | |
What happens when a pH indicator, such as litmus paper, is placed in a solution? |
| | A) | The pH level of the solution changes. |
| | B) | The colour of the solution changes to indicate its pH level. |
| | C) | The litmus paper dissolves in an acid and remains unchanged in a base. |
| | D) | The colour of the indicator changes to show the concentration of hydrogen ions and hydroxide ions. |
|
|
|
| 5 | |
Which statement accurately describes the difference between an acid and a base? |
| | A) | The pH of an acidic solution is greater than seven, while the pH of a basic solution is less than seven. |
| | B) | When dissolved in water, acids form hydrogen ions, and bases form hydroxide ions. |
| | C) | Acids turn red litmus paper blue; bases turn blue litmus paper red. |
| | D) | Acids taste bitter; bases taste sour. |
|
|
|
| 6 | |
A change of one on the pH scale means that the concentration of hydrogen ions in a solution have changed by a factor of… |
| | A) | one. |
| | B) | ten. |
| | C) | 100. |
| | D) | 1000. |
|
|
.