ATOMS AND MOLECULES -CLASS -9 by PRABHAKAR MIRIYALA

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

Tags

NGSS.MS-PS1-1

When __________ form, the elements lose there individual chemical properties and take on new properties.

• compounds
• atoms
• subscript
• formula

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

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 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

Tags

NGSS.MS-PS1-5

"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

Who proposed Law of Conservation of mass?

• Proust

• Dalton

• Democrats

• Lavoisier

Tags

NGSS.MS-PS1-5

Who proposed Law of constant proportion?

• John Dalton

• Joseph L Proust

• Lavoisier

• Neil's Bohr

'S' is the symbol of ....

• Silicon

• Sulfur

• Sodium

• Above all