Acids & Alkalis

Multiple Choice

Which of the following is an example of an alkali (base)?

• Vinegar

• Lemon juice

• Soap

• Orange juice

Multiple Choice

Which of the following is NOT a characteristic of acids?

• Acids have a pH value of less than 7.

• Acids taste sour.

• Acids are usually solid at room temperature.

• Acids feel soapy.

Multiple Select

Which of the following substances contain acids?

• Lemons

• Tea

• Toothpaste

• Stomach

Open Ended

Explain how the pH scale helps to distinguish between acids, bases, and neutral substances.

Multiple Choice

What is the purpose of a universal indicator in chemistry?

• To measure temperature

• To indicate the strength of an acid or base by changing color

• To dissolve substances

• To neutralize acids

Open Ended

Explain how litmus paper can be used to identify acids and alkalis.

Multiple Select

Select all correct statements about combining acids and bases.

• A strong acid with a weak base creates a weaker acid.

• A weak acid with a strong base creates a weaker base.

• Acids and bases of similar strengths neutralize each other.

• A strong acid with a strong base creates a stronger acid.

Multiple Choice

Which statement best describes what happens when acids and alkalis are mixed together in the correct proportions?

• A neutral solution is formed through a neutralization reaction.

• The solution becomes more acidic.

• The solution becomes more alkaline.

• No reaction occurs.

Open Ended

Describe how you would test for the presence of an acid or alkali (base) in a solution. What materials and indicators would you use?