Unit 1 Lesson 1

Question 1

Polarity

Answer 1

Anything that has a positive charge at one end and negative charge at the other end

Question 2

Cohesion

Answer 2

The property that holds molecules of a substance together

Question 3

Adhesion

Answer 3

The property that holds molecules of different substances together

Question 4

Specific Heat

Answer 4

The energy needed to heat a substance by particular amount

Water heats up slowly and cools down slowly

Question 5

Solvent

Answer 5

A liquid that dissolves substances

Water is the universal solvent (dissolves many things)

Question 6

What are some of the roles of water on Earth?

Answer 6

A. It influences weather. Weather depends on the amount of moisture in the air
B. It shapes Earth’s surface - by erosion and weathering
C. It supports life (drinking and for crops)
D. It supports human activities like bathing and cleaning

Question 7

What states of water occur on earth?

Answer 7

Liquid form - most of earth’s water

Gas form - water vapor. Found in earth’s atmosphere

Solid form - ice or snow

Question 8

Properties of water

Answer 8

A. It sticks to itself (Cohesion)
B. It sticks to other substances (Adhesion)
C. It can absorb large amount of energy (specific heat)
D. It dissolves many things (universal solvent)
E. It has polarity
F. It has capillary action - can move through small tubes
G. It has surface tension

Question 9

Surface Tension

Answer 9

Tightness across the surface of water

Question 10

Permeable

Impermeable

Answer 10

Allows water to pass through. Example sand or gravel

Does not allow water to pass through. Example granite

Question 11

Watershed

Answer 11

A land area that supplies water to a river system
The Mississippi River watershed is the largest in the US

Question 12

Buoyancy

Answer 12

Ability to float