Water 1
What is water ?
Water is a transparent fluid which forms
the world's streams, lakes, oceans and rain,
and is the major constituent of the fluids of
living things.
What percentage of water covers the Earth's Surface ?
71 %
What is the molecular formular of water ?
H2O
What is the melting point of water ?
0℃
Water is vital for all known forms of life.
True or False
True
Pure water is tasteless and Odorless.
True of False
True
Does water change its pH when substances are dissolved in it ?
Yes they are.
A Water molecule is made up of what chemical compound ?
As a chemical compound, a water molecule contains
one oxygen and two hydrogen atoms that are connected by covalent bonds.
Name the two types of properties water has ?
Physical and Chemical
What is the pH level of rain, and what does it contain ?
Rain has a naturally acidic pH of about 5.6 because it contains natural derived carbon dioxide and sulfur dioxide.
What is the boiling point of water ?
100 ℃
Why is water called a universal solvent ?
Water is called a universal solvent because It is able to dissolve a large number of different chemical compounds.
For the human body to function properly, how much water is required to avoid dehydration?
What percentage of water does the human body contain ?
To function properly, the body requires between one to seven liters of water per day to avoid dehydration.
The human body contains from 55% to 78% water, depending on body size.
In a pure state what pH level does water have?
It has a neutral pH which means it's neither acidic nor basic.
Water conducts heat more easily than any liquid except _________ ?
Mercury
In what year did Joseph Louis Gay-Lussac and Alexander von Humboldt show that water was composed of two parts hydrogen and one part oxygen?
In 1805
Name four applications of water ?
For Drinking
Washing
Transportation
Chemical uses
What are some other systematic names for water ?
other names include hydroxic acid, hydroxylic acid, and hydrogen hydroxide.
When was the first decomposition of water into hydrogen and oxygen by electrolysis?
and who was it done by ?
It was first done in 1800 by English chemist William Nicholson.
What did Gilbert Newton Lewis do and when ?
Gilbert Newton Lewis isolated the first sample of pure heavy water in 1933.
The water Molecule is :
Found in :
absorbs:
contributes to :
essential for :
Found in : Planetary Atmospheres
absorbs : Infrared Radiation
contributes to Greenhouse warning
Essential for : Life
Water is the only substance that exists naturally on Earth in all three physical states of matter gas, liquid and rainfall and it is always on the move among them.
True of False
False :
Water is the only substance that exists naturally on Earth in all three physical states of matter gas, liquid and solid and it is always on the move among them.
Physical states of matter are gas, liquid and solid.
What does the 2 stand for in H20 ?
2 hydrogen atoms
The most abundant chemical compound in most living things is :
A: Carbon
B: Water
C : Oxygen
D : Hydrogen
B : Water of course
Water that does not have suspended particles or dissolved substances is said to be:
a: salt water
b: brackish water
c : pure water
d: fresh water
C : pure water