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Technical Interview Questions - 9 Chemistry Special contains question about Chemistry, chemical change, physical change, element, compound, atom, Atomic number, Atomic weight

91. What is chemistry?
92. What is a chemical change?
93. Give example of physical change?
94. What are the forms in which matter exists?
95. What is element?
96. What are the more abundant elements in the earth's crust?
97. What are the major elements in the Human body?
98. What is a compound?
99. What is an atom? What is it made up of?
100. What is Atomic number? What is Atomic weight? 

91. What is chemistry?

Chemistry is the study of the composition of matter.

92. What is a chemical change?

A change, in which a new substance with different properties is formed, is known as chemical change.

93. Give example of physical change?

Dissolving sugar in water

94. What are the forms in which matter exists?

Elements Compounds and Mixture of elements and compounds.

95. What is element?

Elements are the organic materials from which all substances like solid, liquid and gas is made. It is the simplest form of matter.

96. What are the more abundant elements in the earth's crust?

O2 49.6%

Sodium 2.6%

Silicon 25.8

Aluminum 22.0

97. What are the major elements in the Human body?

Oxygen 65%

Carbon 18%

Hydrogen 10%

Nitrogen 3%

Calcium 2.4%

Phosphorus 1.0%

98. What is a compound?

Compounds are pure substances formed from the chemical reaction of elements. They have same composition and same properties, cannot be broken down except by chemical reactions.

99. What is an atom? What is it made up of?

Atoms are smallest particles of elements which can exist with the properties of the element. Different atoms of the same elements are alike in always, atoms of different elements are unlike. 

It consists of a nucleolus composed of proton and neutrons with electrons around the nucleus, protons are positively charged, electrons are negatively charged and neutrons are neutral.

100. What is Atomic number ? What is Atomic weight?

Atomic number is the number of protons in the atom of an element, which is equal to the number of electrons.

Oxygen as a standard to the weight of the atoms of elements, which are too small to be measured or to mean any thing. Oxygen is given a number 16 as it is a atomic weight. Atomic weight of all other elements is relative to this figure.

Thanks for reading - Technical Interview Questions - 9 Chemistry Special
Naitik Patel
Industrial Guide

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