Chapter 2 Chemistry of Life

What kind of chemicals make up our bodies and the physical environment?

• Elements

• Compounds

• Atoms

• Molecules

Tags

NGSS.HS-LS1-6

Why is life's chemistry tied to water?

• Life first evolved in water.

• All living organisms require water.

• The chemical reactions of our body occur in cells consisting of 70-95% water.

• Water dissolves a wide range of substances, facilitating chemical reactions in cells.

Elements cannot be broken down to other substances.

• True
• False

What is matter composed of?

• Chemical elements

• Energy

• Sub particles

• Trace elements

What 4 elements make up 96% of the weight of our bodies?

• Carbon, Oxygen, Hydrogen, and Nitrogen

• Carbon, Calcium, Phosphorus, and Potassium

• Oxygen, Fluoride, Nitrogen, and Carbon

• Nitrogen, Hydrogen, Oxygen, and Magnesium

• Carbon, Hydrogen, Calcium, and Nitrogen

What element makes up most of our bodies and what is the percentage?

• Oxygen, 65%

• Hydrogen, 65%

• Oxygen, 75%

• Nitrogen, 55%

How many elements are ESSENTIAL for life?

• 25

• 20

• 65

• 4

A deficiency in which of these trace elements can cause the goiter disease?

• Iron

• Iodine

• Magnesium

• Sodium

How many elements exist in nature?

• 92

• 101

• 56

• 65

What is the smallest unit of an element?

• atom

• molecule

• sub particles