Class 9 lmjps holiday home work solution chemistry

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Chemistry

Solutions

Solutions


Ans 1 :   -All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.



Ans 2:-   Limitations of Dalton’s Atomic Theory
It does not account for subatomic particles: Dalton’s atomic theory stated that atoms were indivisible. However, the discovery of subatomic particles (such as protons, electrons, and neutrons) disproved this postulate.
It does not account for isotopes: As per Dalton’s atomic theory, all atoms of an element have identical masses and densities. However, different isotopes of elements have different atomic masses (Example: hydrogen, deuterium, and tritium).
It does not account for isobars: This theory states that the masses of the atoms of two different elements must differ. However, it is possible for two different elements to share the same mass number. Such atoms are called isobars (Example: 40Ar and 40Ca).
Elements need not combine in simple, whole-number ratios to form compounds: Certain complex organic compounds do not feature simple ratios of constituent atoms. Example: sugar/sucrose (C11H22O11).
The theory does not account for allotropes: The differences in the properties of diamond and graphite, both of which contain only carbon, cannot be explained by Dalton’s atomic theory.

Ans3:-. Atomic Number Element Symbol
1  Hydrogen H
2  Helium He
3 Lithium Li
4 Beryllium Be
5 Boron B
6 Carbon C
7 Nitrogen N
8 Oxygen O
9 Fluorine F
10 Neon Ne
11 Sodium Na
12 Magnesium Mg
13 Aluminium Al
14 Silicon Si
15 Phosphorus P
16 Sulfur S
17 Chlorine Cl
18 Argon Ar
19 Potassium K
20 Calcium Ca




Ans 4:-.  The laws of chemical combination describe the basic principles obeyed by interacting atoms and molecules, interactions that can include many different combinations that happen in many different ways.

Ans 5 :- Law of conservation of mass states that during any physical or chemical charge, the total mass of the product is equal to the total mass of reactant.
Example :- When landelt took the solutions of NaCl and AgNO 
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  separately in Landolt's tube, they are sealed and weighed after weighing two solutions mixes thoroughly as a result a reaction.
AgNO 
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 +NaCl⟶AgCl+NaNO 
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Again the weight is measured and it remain practically same.

And 6

magnesium hydroxide-::Formula: Mg(OH)2

Potassium Sulphate-::Formula: K2SO4

calcium sulphate-::Formula: CaSO4

aluminium chloride-::Formula: AlCl₃

Calcium chloride-::formula CaCl2

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