Acids and bases

Milk is a very weak acid. What might its pH value be?

• 6.5

• 7.8

• 4.2

• 12.2

Tags

NGSS.MS-PS1-2

When acids react with metals, they produce hydrogen gas and salt.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an acid?

• vinegar

• bleach

• sugar in water

• starch in water

• toothpaste in water

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 pH values represents a base?

• 2.1

• 4.6

• 6.8

• 8.1

Which of the following is a base?

• baking soda in water

• orange juice

• vinegar

• lemonade

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

What is an acid?

• a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus paper red
• Has a pH of 11
• Has a pH of 7

What is a base?

• Has a pH of 3
• Has a pH of 7
• substances that are slippery to the touch; turns red litmus paper blue