Ch 5 - Water, Air, and Weather Flashcards
How much of the earth’s surface is covered with water?
three quarters
What are clouds made of?
water and air
Which kind of cloud is large and puffy?
cumulus
Which kind of cloud is light and feathery?
cirrus
Which kind of cloud looks like a blanket?
stratus
Which kind of cloud sometimes forms thunderheads?
cumulus
Which kind of cloud is called fog when it is very close to earth?
stratus
Which kind of cloud is often a sign of an approaching storm?
cirrus
Which kind of cloud is made of air and ice crystals?
cirrus
Which kind of cloud usually brings light rain or snow?
stratus
Which kind of cloud usually appears during fair weather?
cumulus
What percentage of your body is water?
65%
How much water does your body need to take in each day?
About 1.5 litres (Abbie) or 2 litres for an adult woman
What happens to your blood if you do not replace the water your body loses each day?
The blood becomes thicker and harder for the heart to pump.
What is matter?
anything that takes up space and has weight.
What is a molecule?
the smallest piece of a substance that still has all the qualities of that substance
What are the particles that make up a molecule called?
atoms
What happens to molecules of water during photosynthesis?
They are split into atoms of hydrogen and oxygen.
What happens to atoms of hydrogen and oxygen when your body uses food?
They are combined to form water.
In what three states does matter exist?
solid, liquid, and gas
Give an example of something in its solid, liquid, and gas states.
As a solid, water is ice; as a liquid, water; and as a gas, steam or water vapour.
Are ice, water, and steam different substances? Why or why not?
No. They are all different forms of the same substance.
Which state of matter has no shape and does not fill up a fixed amount of space?
a gas
Which state of matter has a definite shape and fills up a fixed amount of space?
a solid
Which state of matter has no shape of its own but fills up a fixed amount of space?
a liquid
List the states of matter according to the speeds of their molecules, from fastest to slowest.
gas, liquid, solid
Describe the action of molecules in a solid.
They vibrate very slowly.
What causes molecules to move more rapidly?
heat
What happens when the motion of the molecules in a solid or a liquid becomes stronger than the attraction of the molecules to each other?
The liquid becomes a gas and the solid becomes a liquid.
Which state of matter is represented in the picture shown?
a gas
Which state of matter is represented in the picture shown?
a liquid
Which state of matter is represented in the picture shown?
a solid
What is water’s melting point?
0 degrees Celsius (32 F)
What is water’s boiling point?
100 degrees Celsius (212 F)
What happens to most liquids when they become colder?
They contract.
What happens to water when it becomes colder?
It expands.
Why is this unique characteristic of water important?
It’s important because it causes ice to float rather than sink.
Why can objects heavier than water float in water?
surface tension