Earth Science Unit 1 lesson 1 Water and it's Properties
What is a water molecule composed?
2 hydrogens and 1 oxygen- Which is the formula for H20
How much of the freshwater used by humans is used for in dustrial purposes such as two manufactured goods, cool power stations, clean industrial products, extract minerals and generate energy by using hydroelectric dam?
20%
What percentage of water on earth is fresh water?
3%
How much water do humans make up?
70%
What percent of water on earth is saltwater?
97%
Solvent
A liquid substance capable of dissolving other substances
When water changes state, what happens to the energy?
Absorbs or release
The property that holds molecules of different substances together is called what?
Adhesion
What property of water allows certain water to stick to a spider?
Adhesion
Matter is made of tiny particles called what?
Atoms-Which can join with other atoms to make molecules
What are examples of how water is used for human activities?
Bathing, cleaning, watering lawns and gardens, drinking and doing dishes
Why do water molecules stick together tightly?
Because of polarity
Gravity
Causes Liquid water to flow downhill and to rest and low lying areas and became lakes rivers and oceans
In a living organism what is water needed for?
Cellular chemistry, regulates temperature, transport substances
What characteristic of water accounts for its properties of adhesion, cohesion, high specific heat and nature as a solvent?
Chemical reaction
What is the property that holds molecules of a substance together called?
Cohesion
What property of water allows certain insects to walk on top of a pond?
Cohesion
What property of water allows it to form droplets when it is in liquid form?
Cohesion
What property of water allows one to fill a glass above the rim?
Cohesion
weather
Depends on the amount of moisture in the air
What are the properties of water in the solid-state?
Different shapes and different volume
Why is earths water vapor not found in low places?
Expands to fill available space
What are the properties of water in the gaseous state?
Fills the available space, expands to fill the space, doesn't have a different shape or volume
What are the properties of water in the liquid state?
Flows, definite volume shape of container
Why do humans need clean water?
Good health and in order to survive
What is water used for in agriculture?
Irrigating crops and care for farm animals
Why is water called the universal solvent?
It dissolves more substances than any other liquid
What happens when water freezes?
It expands and there are more open spaces between the water molecules. Therefore ice is less dense than liquid water so it ice floats on liquid water
What form of water makes up most of earth?
Liquid
In a water molecule, the oxygen atoms have a small what?
Negative charge
What is contaminated water sources harmful to?
Plants, animals and can affect crops that provide food for humans
In a water molecule, the hydrogen atoms have a small what?
Positive charge
How do ocean waves reshape a landscape?
Pounds the beaches
What are the forms of water that fall to earth?
Rain, hail, snow, sleet
How do glaciers and reshape a landscape?
Scrapes away rock and soil, depositing your sediment when it melts
What are the four properties of water?
Stick to itself, Absorbs a large amount of energy, Dissolves many things, And sticks to other substances
How do you rivers reshape the landscape?
They can wear away rock and carry away sediment and soil
When water drops roll off services made of non-polar molecules it is called what?
Unwettable or waterproof- ex. Rubber boots
wettable
Water molecules that can stick to the molecules of other polar substances Ex. Paper towel
The ability of water to the store and release heat is very important in what?
Weather and climate
Polarity
anything that has a positive charge at one end and a negative charge at the other end
Four roles of water on Earth
influencing weather, shaping earth's surface, supporting life, supporting human activites
What are the three states of water?
solid, liquid, gas
The energy needed to heat substance by a particular amount
specific heat
water vapor
water in the form of a gas. Or it can freeze into solid ice or snow
