Law of conservation of mass .

Heba Abu Hammoud

Zahra’a Al yasari

The Law of conservation of mass states that mass is neither created nor destroyed during a chemical reac – tion – it is conserved. In other words, the

mass of the reactants equals the mass of the products. The equation form of the law of

conservation of mass is as follows .

Law of conservation of mass :

The Law of Conservation of Mass tell us that the mass of a closed system

will remain constant over time. It also tells us the matter cannot be created

or destroyed

h Law of conservation

of Mass

The analyti cal blance,which

was copable of measuring small change in mass was develop at the same time.

Mass is neither

created nor destroged

during chemical reaction

Chemical change a

cured during measuring the

mass befor and after the

reation

Mass reactants

=Mass

products

2H2 + O2 2H2O

4H 20 = 4H ,20

http://www.youtube.com/watch?v=wwJJK4korRg

1. When a log burns in a fire, the ashes have a much lower mass than the log.

Explain .

2. What is the gas used to extinguish the fire ?