Chapter 3 Environmental Systems: Matter, Energy, and Life

In general, what types of substances tend to be acidic?

• coffee

• soda pop

• drain cleaner

• vinegar

• soap

Tags

NGSS.MS-PS1-2

What types of substances tend to be alkaline or basic?

• lemon juice

• hand soap

• soda pop

• oven cleaner

• ammonia

A pH of less than 7 indicates that the liquid is

• acidic

• a base

• alkaline

• neutral

A pH of g4reater than 7 indicates a liquid is

• acidic

• alkaline (basic)

• neutral

• water

Tags

NGSS.MS-PS1-2

A pH of 7 indicates that a liquid is

• acidic

• alkaline (basic)

• neutral

Tags

NGSS.MS-PS1-2

Rainfall generally has a pH value between 5 and 6.5. It is acidic because of dissolved carbon dioxide and air pollutants, such as sulfur dioxide or nitrogen oxides. Heavy rains can change the pH of streams and rivers by

• lowering the pH and making the water more acidic

• raising the pH and making the water more alkaline (basic)

• having no affect on pH

Tags

NGSS.MS-PS1-2

If rain water flows over soil containing hard-water minerals, such as limestone, the pH of the water will _____________________ producing pH values between 7 and 8.5.

• increase

• decrease

• remain neutral

Tags

NGSS.MS-PS1-2

The optimal pH level for fish and aquatic insects is between

• 6.5 and 8.2

• 4.5 and 5.0

• 9.0 and 10.5

• 11.0 and 11.5

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

Which foods contain high levels of starch?

• potato

• apples

• tuna

• bread

• milk

Which foods are good sources of protein?

• tuna

• milk

• apples

• potatoes

• beans