Biology-Water
What is surface tension?
A property of liquid that allows it to resist an external force due to the cohesive nature of water molecules.
What is adhesion and cohesion?
Adhesion is when water is attracted to other substances and cohesion is when water is attracted to itself.
How does ice melting help keep food in a cooler cold?
As the ice melts, it takes in heat and extracts the heat from surrounding objects like food.
What is boiling?
Boiling is the process in which water (liquid) turns into a gas when it reaches a specific temperature.
What is the boiling point of water?
Boiling point of water: 100 C or 212 F
What is condensation?
Conversion of vapor or gas to a liquid.
What is evaporation and how is it important in the water cycle?
Evaporation is the process of liquid water turning into a gas or vapor. It is important in the water cycle because is supports the surface-to-atmosphere portion of the water cycle.
How does ice protect aquatic animals?
Floating ice acts as an insulation for the marine animals below the water, allowing them to survive for long periods of cold stages.
What are the freezing point and boiling point of water?
Freezing point: 32 F Boiling point: 212 F
What is the chemical formula for water?
H2O
Why is water a unique compound here on earth?
Only natural substance that is found in a solid, liquid, a gas state.
What is unusual about solid water compared to solids of other materials?
Solid water (ice) is lighter than liquid water, while most solids are more dense and sinks.
Why does water act "sticky"?
The hydrogen bonds and molecules are highly cohesive and they do not like to fall apart.
What is condensation and how is it important in the water cycle?
The process in which water vapor turns back into a liquid. It is important in the water cycle because is it responsible for the formation in clouds and the primary route for water to return to the earths surface within the water cycle.
Identify three places where water can be stored?
Water can be stored in the ocean, in the atmosphere as vapor, in glaciers, and in the ground as groundwater
what is a reservoir?
when water is stored for household, industrial, and agricultural use
how can runoff be a problem?
it can cause serious flooding and erosion, and can carry contaminants into rivers, lakes and oceans.
How does surface tension work?
surface tension is when the surface is a liquid allows it to resist an external force, due to the cohesive nature of its molecules.
What is specific heat?
water absorbs a lot of heat before it begins to get hot. It helps regulate the rate at which air changes temperature.
how do cloud form?
when saturated air in the atmosphere cools, water vapor condenses into tiny droplets to form clouds.
what causes it to rain?
when water droplets in the clouds get to heavy and large, they fall as rain.
By what percent does water expand when it freezes?
9%
How much of earth's freshwater is in the ocean?
96.5%
What is a polar molecule?
A polar molecule is when one side of the molecule is positively charges and one side is negatively charged.
What creates surface tension and capillary action?
Hydrogen bonds allow surface tension and capillary action to take place
Where is most of Earth's surface water found?
The oceans, seas, and bays
what is evaporation?
The process of turning any liquid into a vapor
What is water made up of?
Two oxygen molecules and one hydrogen molecule
How long can a human live without water?
Water is so important that humans can live only a week without water.
What happens to the boiling point of water when you decrease the air pressure?
Water starts to boil at a much lower temperature.
what is an aquifer?
an underground layer of porous rock and/or sand
How much of earth's water is actually usable?
1%
How much of earth's freshwater is in glaciers and ice caps?
1.74%
At what temperature does water begin to expand?
38 degrees F or 3 degrees C
Why is water called the universal solvent?
It dissolves more substances than any other liquid.
What is cohesion?
Due to the hydrogen bonds, cohesion is the acts of water sticking together and forming droplets.
What is precipitation and how is it important in the water cycle?
The process of water releasing from the clouds in the forms of rain, freezing rain, sleet, snow or hail, Provides the delivery of atmospheric water to the earth.
Why does water have a lopsided shape and act like a chemical magnet?
There is an uneven distribution of electrical charges between the hydrogen and oxygen atoms. The oxygen is negative and it attracts positive materials. The hydrogen is positive and it attracts negative materials.
What is transpiration?
Transpiration is the process by which moisture is carried through plants from the roots to the small pores on the underside of leaves. It is the evaporation of water from plant leaves
