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Ninth Grade (Grade 9) Acids and Bases Questions

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Grade 9 Acids and Bases
Acidic solutions contain high concentrations of which of the following?
  1. electrons
  2. hydrogen ions
  3. hydroxide ions
  4. water
  5. oxygen
Grade 9 Acids and Bases
When an unknown substance is dissolved in water, hydronium ions form. What can you conclude about the substance?
  1. The substance is a gas.
  2. The substance is a base.
  3. The substance is a carbohydrate.
  4. The substance is an acid.
Grade 9 Acids and Bases
Acidic solutions contain high concentrations of which of the following?
  1. H+ ions
  2. OH- ions
  3. Water
  4. Oxygen
Grade 9 Acids and Bases
What is the pH of pure water?
  1. pH=0
  2. pH=14
  3. pH=7
  4. pH=5
Grade 9 Acids and Bases
Listed below are common household ingredients with their pH value listed. Which one is the strongest base?
  1. Baking Soda, pH=8.8
  2. Vinegar, pH=3.2
  3. Bleach, pH=13.1
  4. Oven Cleaner, pH=11.2
Grade 9 Acids and Bases
What is produced when an acid reacts with a base?
  1. a base and water
  2. water and ethane
  3. water and salt
  4. water only
Grade 9 Acids and Bases
When an acid dissolves almost completely in water, it is called which of the following?
  1. weak acid
  2. strong acid
  3. weak base
  4. strong base
Grade 9 Acids and Bases
What is the chemical name for HCl?
  1. Hypochloric Acid
  2. Hypochlorous Acid
  3. Hydrochloric Acid
  4. Chloric Acid
Grade 9 Acids and Bases
Which of the following theories defines acid as a species that forms hydronium ion in water?
  1. Arrhenius theory
  2. Lewis acid-base theory
  3. Lowry-Bronsted theory
  4. None of the above
Grade 9 Acids and Bases
What happens when blue litmus paper is dipped in dilute nitric acid?
  1. The blue litmus paper turns red.
  2. The blue litmus paper turns colorless.
  3. The blue litmus paper turns yellow.
  4. The blue litmus paper turns green.
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