Chemistry notes class 9th

I want to get the CBSE Chemistry notes class 9th so can you provide me that as I want to prepare for my exams

As you want to get the Chemistry notes class 9th of CBSE so here is the information of the same for you:

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Q1: What are the branches of chemistry?
Ans: The five branches of chmistry are as follows:
1: Organic chemistry:-Organic chemistry is the study of carbon containing substances and the synthesis of such material. many consumer products are organic in nature.
2: Inorganic chemistry: Inorganic chemistry is the chrmistry of element and their compounds except those of carbon-hydrogen compounds and their derivatives.
3: Physical chemistry: Physical chemistry is the branch of chemistry which deals with the forces and principles involved in the combination of atoms and molecules.
4: Analytical chemistry:Analytical chemistry is the study of method and techniques used to determind the kind and quantity of various component in a given substance.
5: Biochemistry: Biochemistry is the chemistry of living organisms such as plants and animals.

Q2: Define mass?
Ans:Mass:-The quantity of matter contained in a body is called its mass. Its s.i unit is "kilogram" and its symbol is "m".

Q3: Define volume?
Ans: Volume:- Space occupaid by a body is known as volume. Its s.i unit is "m3" and its symbol is "v".

Q4: Define density?
Ans: Density:-It is define as ratio between mass and volume. mass per unit volume is known as density.
mathematically: d=m
v
its s.i unit is kg/m3. density of solid and liquid usually expressed in g/cm3 and that of gases as g/dm3.
Q5: Define temperature?
Ans: Temperature:- Temperature is a measureof the intensityof heat. it is thus a measure of the degree of hotness and coldness in a body.

Q6: Define specific gravity?
Ans: Specific gravity:- The specific gravity of a substance is the ratio of its mass to the mass of an equal volume of water at a specified temperature.
Specific gravity = mass of substance
mass of an equal volume of water
specific gravity of a substance ia a ratio between two same quantites and thenfore has no unit.

Q7: Define element?
Ans: Element:- An element is defined as a substance in which all the atoms are chemically indentical havingsame atomic number. for example: iron: silver: gold: copper: oxygen: hydrogen: etc.

Q8: Define compound?
Ans: Compound:- A compound is pure substances which consist of two or more element chemically combined in a fixed proportion by mass.compound can be broken down by chemical method.
for example:water(H2O); salt(NaCl).

Q9: Define mixture?
Ans: Mixture:-A mixture contains two or more element which can easily be seprated by physical method. the component doesnot lose its chemical propertse.
for example: soil; rock; e.t.c.

Q10: Define valency?
Ans: Valency:-The chemical combining capacity of an atom or an element with another element is called valency.

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descrie mole concept plzzzzzzzzzzzzzzzzzzzzzzzzzzz

hi, here i would like to share notes applicable to mole concept for which you are looking here, actually A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 1023) and it involves the acceptance of two dictates -- the scale of atomic masses and the magnitude of the gram.

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Answered By StudyChaCha Member

mole..;;;'[atomicmass formulamass or formulamass of unit express in gram is called mole