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Acids, alkalis (bases) and the pH scale

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS1-2 · England: KS3 Chemistry: Chemical reactions (acids and alkalis)

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Score/ 16

1
Question 1
Universal indicator turns red in a solution. What does this tell you?
- A. It is a strong acid
- B. It is a strong alkali
- C. It is neutral
- D. It is pure water
2
Question 2
A solution has a pH of 2. Is it acidic, neutral or alkaline (basic)?
- A. acid
- B. neutral
- C. alkali (base)
3
Question 3
Acids and alkalis: which statement is NOT true?
- A. Alkalis have a pH below 7.
- B. Acids have a pH below 7.
- C. Strong acids and alkalis can be corrosive, so eye protection is needed.
- D. Pure water has a pH of 7.
4
Question 4
Which of these is an alkali (base)?
- A. orange juice
- B. sodium hydroxide solution
- C. hydrochloric acid
- D. vinegar
5
Question 5
A solution has a pH of 7. Is it acidic, neutral or alkaline (basic)?
- A. acid
- B. neutral
- C. alkali (base)
6
Question 6
Acids and alkalis: which statement is NOT true?
- A. Alkalis are bases that dissolve in water.
- B. Pure water has a pH of 7.
- C. A pH of 1 is a weak acid.
- D. Acids have a pH below 7.
7
Question 7
Which of these is an alkali (base)?
- A. hydrochloric acid
- B. vinegar
- C. orange juice
- D. sodium hydroxide solution
8
Question 8
A solution has a pH of 5. Is it acidic, neutral or alkaline (basic)?
- A. acid
- B. neutral
- C. alkali (base)
9
Question 9
Acids and alkalis: which statement is NOT true?
- A. Pure water has a pH of 7.
- B. Strong acids and alkalis can be corrosive, so eye protection is needed.
- C. Alkalis are bases that dissolve in water.
- D. All acids are dangerous.
10
Question 10
Which of these is an alkali (base)?
- A. vinegar
- B. hydrochloric acid
- C. orange juice
- D. sodium hydroxide solution
11
Question 11
A solution has a pH of 12. Is it acidic, neutral or alkaline (basic)?
- A. acid
- B. neutral
- C. alkali (base)
12
Question 12
Acids and alkalis: which statement is NOT true?
- A. Pure water has a pH of 7.
- B. A pH of 1 is a weak acid.
- C. Alkalis are bases that dissolve in water.
- D. Strong acids and alkalis can be corrosive, so eye protection is needed.
13
Question 13
Which acid is found in your stomach?
- A. sulfuric acid
- B. nitric acid
- C. citric acid
- D. hydrochloric acid
14
Question 14
A solution has a pH of 6. Is it acidic, neutral or alkaline (basic)?
- A. acid
- B. neutral
- C. alkali (base)
15
Question 15
Acids and alkalis: which statement is NOT true?
- A. Acids have a pH below 7.
- B. Strong acids and alkalis can be corrosive, so eye protection is needed.
- C. Alkalis have a pH below 7.
- D. Alkalis are bases that dissolve in water.
16
Question 16
Which of these is an alkali (base)?
- A. sodium hydroxide solution
- B. vinegar
- C. orange juice
- D. hydrochloric acid

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Answer key: Acids, alkalis (bases) and the pH scale

1. A. It is a strong acid
2. A. acid
3. A. Alkalis have a pH below 7.
4. B. sodium hydroxide solution
5. B. neutral
6. C. A pH of 1 is a weak acid.
7. D. sodium hydroxide solution
8. A. acid
9. D. All acids are dangerous.
10. D. sodium hydroxide solution
11. C. alkali (base)
12. B. A pH of 1 is a weak acid.
13. D. hydrochloric acid
14. A. acid
15. C. Alkalis have a pH below 7.
16. A. sodium hydroxide solution