atoms and molecules class 9

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

When you heat matter, what happens to the atoms and molecules?

• they move faster 
• they move slower
• they stop moving
• they stay the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Atomicity is ......

• the number of atoms present in an element.

• the number of atoms present in a molecule.

• atomic mass

• none of the above

The smallest particle of a substance is......

• atom

• element

• molecule

• compound

The short-hand notation of an element is called....

• formula

• symbol

• mark

• representation

The bonding capacity of an element is called......

• Atomic number

• Atomic Mass Unit

• Molecular mass

• Valency

"Total mass of the products formed in chemical reaction is exactly equal to the total mass of the reactants present in it." is a .....

• Law of constant proportion

• Law of multiple proportion

• Law of conservation of mass

• All the above

"In a compound, the elements always present in the fixed ratio of their mass." is a ....

• Law of constant proportion

• Law of conservation of mass

• Law of multiple proportion

• None of the above

Father of modern chemistry is......

• Antoine Lavoisier

• Joseph L Proust

• John Dalton

• Rutherford

Who proposed Law of Conservation of mass?

• Proust

• Dalton

• Democrats

• Lavoisier