Question

1. Law of conservation ol me
and products remain unch
2. Law of definite proportions.
same elements combined
3. An atom is the smallest particle
reaction
ducts remain unchanged in a chemical reaction
e proportions states that a pure compound always contains the
Clements combined in the same proportions by mass
dtom is the smallest particle ofan element which can take part is nem
4.1. Moderns
represent a pa
Examples of
Dalton's atomic theory explains the law of conservation
y explains the law of conservation of mass and the lavo
definite proportions.
5. A molecule is the smallest particle of an element or compour
illest particle of an element or compound that is capable
of independent existence and shows all the properties o
istence and shows all the properties of that substance
of an atom of carbon -12 is assigned atomic mass of 12 atomic mass
units and the atomic mass of other elements are obtained by
mass of other elements are obtained by comparison with
the mass of a carbon -12 atom.
6. The mass of an atom of carbon 121
Carbon
Fluorina
EXERCISES
Hydrog
- lodine
There are a
1. What are the postulates of Dalton's atomic theory?
barium, bro
2. 3 g of magnesium combines with 2 g of oxygen to produce 5g of magnesium oxide
compound. If 6g of magnesium is allowed to react with 20g of oxygen, what mass used. The
letter of the
of magnesium oxide will be produced in the reaction? Name the law which govem
your answer
3. Distinguish between atom and molecule of an element.
4. Define atomic mass unit.
Namne
5. Why are atoms regarded as building blocks of all matter?
2​

Answer 1

Answer:

4.a unit of mass used to Express atomic and molecular weight, equal to one twelve of the mass of an atom of carbon -12