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Ninth Grade (Grade 9) Acids and Bases Questions

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Grade 9 Acids and Bases
Dilute and concentrated refer to                                        .
  1. the concentration of a solution
  2. how much water is added to the solution
  3. how high the boiling point is
  4. none of the above
Grade 9 Acids and Bases
Substances that release hydrogen ions (H+) when dissolved in water.
  1. buffers
  2. molecules
  3. acids
  4. salts
  5. bases
Grade 9 Acids and Bases
Substances that release hydroxide ions (OH-) when dissolved in water.
  1. acids
  2. bases
  3. elements
  4. salts
  5. atoms
Grade 9 Acids and Bases
A substance with a pH of 0 is a                .
  1. neutral
  2. strong acid
  3. strong base
  4. metal
  5. non-metal
Grade 9 Acids and Bases
These are weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH.
  1. Hydrogen ions
  2. Buffers
  3. Solution
  4. Hydroxide ions
  5. Atoms
Grade 9 Acids and Bases
A substance with a pH of 1.5 is classified as a/an                  .
  1. acid
  2. base
  3. neutral
  4. salt
  5. none of the above
Grade 9 Acids and Bases
Bases taste bitter, while acids taste sour.
  1. True
  2. False
Grade 9 Acids and Bases
Bleach is classified as a/an                .
  1. base
  2. salt
  3. acids
  4. neutral
  5. both b and c
Grade 9 Acids and Bases
What is the scale called that measures the strength of acids and bases?
  1. pH scale
  2. Acidity scale
  3. Corrosive scale
  4. Hydrogen scale
Grade 9 Acids and Bases
Which pH value indicates a neutral solution?
  1. 0
  2. 5
  3. 7
  4. 10
Grade 9 Acids and Bases
Which of these is a proton donor?
  1. A buffer
  2. A base
  3. A water molecule
  4. An acid
Grade 9 Acids and Bases
If a substance is considered to be a base, that means it has which of the following set of properties?
  1. low concentration of H+ ions, has a pH value of 1 to 6
  2. low concentration of OH- ions, has a pH value of 1 to 6
  3. high concentration of H+ ions, has a pH value of 8 to 14
  4. high concentration of OH- ions, has a pH value of 8 to 14
Grade 9 Acids and Bases
A strong base is characterized by which of the following?
  1. A high concentration of hydrogen ions
  2. A high concentration of hydroxide ions
  3. A high pH
  4. A low pH
  5. Both b and c
  6. Both a and d
Grade 9 Acids and Bases
The pH scale is used to measure                       .
  1. How acidic a liquid is
  2. How basic a liquid is
  3. Both (a) and (b)
  4. None of the above
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