PLEASE SOLVE OUT 4 Questions.........
Answers
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6) Law of conservation of Mass - It states that mass is conserved in any reaction.
Mass of reactants = mass of products
Example:-
C + O₂ = CO₂
mass of carbon = 12u
mass of oxygen = 16u
In a reaction,
reactants, 12 u + 2×16 u = 44u
products = 12 u + 2×16 u = 44u
Thus mass of reactant = mass of product
Law of constant propotion:- it says that, a chemical molecule will always contains the same elements in the same proportion.
Example:- water molecules always contain Hydrogen and oxygen in 1:2.
7) Dalton's atomic theory:- He syas that, all elements are made up of small indivisble particles called atoms.
All atoms of the same elemnts are identical in all respects.
⊕ Limitation of dalton's atomic theory:-
1. Atoms are devisible [electron,proton and neutron]
2.All atoms are not identicals, like isotpes of carbon have diffrent mass[C¹²,C¹⁴]
8. a)Atoms:- Atom is the smallest particle on any element [while atoms furthuer can be devided in electron,proton and neutron].
b) Molecule:- Molecule is made up of More than two atoms of diffrent elemnts or same.
like- H₂ ,O₂, H₂SO₄ etc.
C) Atomic mass:- sum of Mass of total protons and neutrons is called atomic mass.
9.a) H₂O
2(1) + 16 = 18g/mol
b) H₂SO₄
2(1) + 32 + 4(16) = 98g/mol
c) HNO₃
1 + 14 + 2(16) = 47g/mol
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