Unit 4 Acids and Bases

Which statement is true when acids and bases are mixed together?

• acids become stronger
• bases become stronger
• there is no change
• they neutralize each other

What is the pH of water?

• 0
• 4
• 7
• 14

What does a pH of 1 indicate about a liquid?

• it is a very strong base
• it is a weak base 
• it is a weak acid
• it is a strong acid

Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution.  If you test a base with litmus paper, it will turn ____________.

• purple
• red
• blue
• pink

When dissolved in water, acids produce:

• bases
• salts
• hydrogen ions
• hydroxide ions

Tags

NGSS.MS-PS1-2

Any substance that produces hydroxide ions in water is known as _____________.

• an acid
• a hydrogen ion
• a base
• a neutral

A hydrogen ion, H⁺, is the same as a(n):

• neutron
• electron
• proton
• hydroxide ion

Tags

NGSS.MS-PS1-1

What is the range of pH values in an acidic solution?

• 0-7
• 7-14
• 15-239058204958
• pH = 7

This is one way to show a neutral substance:

• [H⁺]=[OH^-]
• [H⁺]~~[OH^-]
• [H⁺]<[OH^-]
• [H⁺]>[OH^-]

An indicator will ______________ when it is in contact with an acid or base

• Bubble
• Form a new substance
• Change color
• Stay the same color

Tags

NGSS.MS-PS1-2