In Section 1.1 of the text, the concept of a chemical reaction was introduced with the example of the decomposition of water, represented as follows:
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In Section 1.1 of the text, the concept of a chemical reaction was introduced with the example of the decomposition of water, represented as follows: Use ideas from Dalton’s atomic theory to explain how the above representation illustrates the law of conservation of mass. |
Explanation
According to law of conservation of mass
Mass is not created or destroyed in a close system
law of constant composition says that a pure compound will always have the same proportion of the same elements
It means
In a chemical reaction, amount of each element individuall must be same in starting reactant and end product of reaction
In above reaction
2H2O is converted into 2H2 and O2 molecule by passing electric current
Now in reactant
We have 4 hydrogen atoms and 2 oxyen atoms together in the form of water molecule
After passing electricity
We also have 4H and 2 oxygen atom
Means
amount of hydrogen and oxygen remains same
I.e Mass taken of atoms on the both is same
which is law of conversation of mass
Answer
Dalton theory is based on law of conservation of mass and law of constant composition
Key point of this theory
1 all matter is made up of tiny particle which are indivisible
2 atoms of a given element are identical in mass and properties
3 compounds are formed by the combination of atoms
4 chemical reaction is rearrangement of atoms
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