ATOMS AND MOLECULES CLASS IX

ATOMS AND MOLECULES CLASS IX

LAW OF CHEMICAL COMBINATION

1. LAW OF CONSERVATION OF MASS
2. LAW OF CONSTANT PROPORTION OR DEFINITE PROPORTION

Multiple Choice

Which law states that mass can neither be created nor be destroyed and given by ______________________.

• Law of conservation.

• Law of definite, Antonie Lavoisier

• Law of conservation, Proust

• None of the above

Multiple Choice

Which law states that mass can neither be created nor be destroyed?

• LAW OF MULTIPLE PROPORTION

• LAW OF CONSERVTION OF MASS

• LAW OF CONSTANT PROPORTION

• LAW OF CONSTANT PROPORTION

Multiple Choice

Which law states that in a chemical substance the elements are always present in definite proportion by mass and given by ______________________

• Law of conservation of mass, Proust

• Law of constant proportion,Lavosier

• Law of constant proportion, Proust

• None of the above

Multiple Choice

Atoms of different substances are ___________ in all aspects i.e they possess different size, shape, mass etc.

• different

• same

• both 1 & 2

• none of the above

Multiple Choice

Atoms of the same substances are _____________________ in all aspects, i.e they possess same size, shape , mass, chemical properties etc

• Different

• Identical

• Both 1 & 2

• None of the above

Multiple Choice

The ratio of mass for oxygen and hydrogen in water will be _______.

• 1:8

• 8:1

• 1:2

• 2:1

Multiple Choice

What is mass of water?

• 3g

• 7g

• 10g

• 18g

Multiple Choice

______________ is the smallest particle that takes part in a chemical reaction.

• Molecule

• Compound

• Atoms

• Ion

Multiple Choice

Atoms of different elements combine with each other in a simple ______________ number ratio to form compound.

• Whole

• Fraction

• Natural

• None of the above

Multiple Choice

The smaller tiny particles of matter which cannot be divided further is called _______________.

• Ion

• Molecule

• Atom

• Compound

Multiple Choice

__________________ is the smallest building block of matter.

• Compound

• Atom

• Molecule

• Both 1 & 2