Question

Define the following :-

(a) Atom

(b) Molecule

(c) Chemical reaction

(d) Compound

(e) Element

(f) Mixture

(g) Displacement Reaction

(h) Neutralisation Reaction

(i) Combination Reaction

(j) Chemical Formula ​

Answer 1

Answer:

a) atom: the smallest particle of a chemical element that can exist.

b) molecule: a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

c) chemical reaction: a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

d) Compound: any substance composed of identical molecules consisting of atoms of two or more chemical elements. eg- methane molecule.

e) Elements: the fundamental materials of which all matter is composed.

f) Mixture: a material made up of two or more different substances which are not chemically combined.

g) displacement reaction: a chemical reaction in which one element is replaced by another in a compound.

h) neutralisation reaction: a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.

I) combination reaction: A combination reaction is a reaction where two or more elements or compounds combine to form a single compound. Such reactions are represented by equations of the following form: X + Y → XY.

j) chemical formula: a set of chemical symbols showing the elements present in a compound and their relative proportions.

hope it helps you...

Answer 2

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Atom:-

The smallest particle of a substance is called an atom.

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Molecule:-

Molecules are formed when two or more than two atoms join together.

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Chemical reaction:-

It is a process by with two or more substance reacts with each other and converted into a different substance.

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Compound:-

Substance that is formed when two or more elements combine chemically.

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Element:-

An element is a substance that is made up of only one kind of son and can't be broken into simpler substance.

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Mixture:-

It consists of two of more substance mixed together , but not chemically combined.

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Chemical formula:-

The representation of a compound using chemical symbols of its constituent elements.

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Combination reaction:-

The reaction in which two or more elements come together to form a single compound is known as combination reaction.

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Displacement reaction:-

The reaction in which one element is displaced by an another element in a compound is known as displacement reaction.

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Neutralisation reaction:-

The reaction in which acid and bases react and gives salt and water.

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