Page 123 - Science Course 2 (Book 1)

Mo4-L3: Key Concept Check

Direction: On each line, write the term from the word bank that correctly completes each sentence. Some
terms may be used more than once

acidic basic hydronium hydroxide
inverse neutral pH solution

1. means that as one thing increases, another thing decreases.
2. For the safety of all swimmers, it is important for pool water to have the correct .
3. A(n) measure of the concentration of hydronium ions in a solution
defines pH.
4. When the concentration of ions increases, the pH decreases.
5. A solution with a lower pH is more .
6. A solution with a higher pH is more .
7. An acid is distinguished from a base by a higher amount of ions than
hydroxide ions.
8. Bases are distinguished from an acid by a higher amount of ions than
hydronium ions.
9. A change from one pH unit to another pH unit represents a ten-fold change in how acidic or basic
a(n) is.
10. Solutions that have a pH of 7 are not acidic or basic; they are referred to as .

Mo4-L3: Lesson Review Quiz (Matching)

Direction: On the line before each definition, write the letter of the term that matches it correctly.
Not all terms are used.

1. a substance that produces a hydronium ion when it is dissolved in water A. indicator
2. a compound that changes color at different pH values when it reacts B. pH
with acidic or basic solutions C. neutral
3. a substance that produces hydroxide ions when dissolved in water D. acid

4. inverse measure of the concentration of hydronium ions in a solution E. base

Direction: Respond to each statement on the lines provided

5. Recall several household and food items that are acidic and several that are basic.

6. State the relationship between the number of hydronium ions and hydroxide ions in a neutral solution.
Write the chemical formula for each ion as part of your answer.

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