Acids and bases_ Grade 7

A substance is found to have the following characteristics:

Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water

In what category would the substance be classified?

• acid

• base

• enzyme

• fatty acid

Which of the following are properties of acids?

• They conduct electricity when dissolved in water

• They taste sour

• They react with metals to produce hydrogen gas

• All of the answer choices are correct

Which of the following is a property of a base?

• bitter taste

• reacts with metals

• salty

• sour taste

All bases have a sour taste.

• True

• False

Which of the following is a base?

• baking soda in water

• orange juice

• vinegar

• lemonade

Many cleaning solutions are bases. Which of the following is a property of most bases?

• feels slippery
• white color
• can only be liquid
• tastes sour

 Which of the following is an acid?

• shampoo
• baking soda
• orange juice
• water

A sour taste is a characteristic of:

• acids

• bases

• neutral

• pH scale

Milk is generally:

• Slightly acidic and becomes more acidic over time.

• Basic, although it becomes more acidic over time.

• Milk is neither acidic nor basic.

• Basic and it becomes more basic over time.

Vinegar, fruit juice, and cola are examples of:

• salts

• neutral substances

• bases

• acids