Water lesson for class 8 icse

The chemical compound of water is

• HO
• H₂O
• H₃O
• HO₂

Tags

NGSS.MS-PS1-1

Water is a universal solvent

• True
• False

A Compound that is being dissolved is called a

• Solution
• Solute
• Solvent
• Suspension

Tags

NGSS.MS-PS1-2

A solvent is...

• substance into which the solute dissolves
• a compound being dissolved
• a substance that does not dissolve
• None of the above

Water is polar because...

• The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
• The molecule has two poles, at which the it is colder than other regions of the molecule.
• The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
• The water molecule is neutral.

Tags

NGSS.MS-PS1-1

True or false, water is a polar molecule? 

• True 
• False 

Tags

NGSS.MS-PS1-1

Acid (H+) + base (OH-) → water + salt

• The reaction above is solution
• The reaction above is a suspension
• The reaction above is neutralization
• The reaction above is condensation

Why is fresh water a limited resource?

• It isn't because it is a renewable resource

• 97% of water is in the oceans and too salty to drink.

• Only 2.5% is drinkable and is stored in icecaps, rivers, and lakes.

Where most freshwater is stored is in _________.

• Groundwater
• pH
• Glaciers
• Sea water

Where 97% of Earth's water is stored?

• Glaciers
• pH
• Groundwater
• Sea water