Acids and Bases

Which of these pH values represent an acid?

• 4

• 8

• 10

• 12

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

When an acid is dissolved in water, it turns red litmus paper blue.

• True

• False

Tags

NGSS.MS-PS1-2

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 an acid?

• vinegar

• bleach

• sugar in water

• starch in water

• toothpaste in water

An acid is a solution that contains __________ ions dissolved in water.

• positive

• negative

The pH value of an acid represents its __________ of positive ions in the solution

• amount

• concentration

• color

• charge

Tags

NGSS.HS-PS1-5

Which of the following is a property of a base?

• bitter taste

• reacts with metals

• salty

• sour taste

The higher the concentration of negative (hydroxide) ions in the solution, the stronger the base is.

• True

• False