Read the passage & answers the Questions below
A molecule is in general a group of two or more atoms that are bonded together by attractive forces.A
molecule can be defined as the smallest particle of an element or a compound that is capable of
independent existence and shows all properties of that substance.
Q1.Differentiate between molecule of an element & molecule of compound.
Q2.Give example of both.(one each)
Q3.Why atoms combine to form molecule?
Multiple choice questions
Q4.Correct symbol of Magnesium is: mg,Mn ,Ma ,Mg
Q5. Technique used for purification of copper sulphate is :
Evaporation, hydration , sublimation , crystallization
Answers
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Answer:
1. a molecule of an element, all the atoms are the same. there is one oxygen atom and two hydrogen atoms. But in a molecule of oxygen (an element), both of the atoms are oxygen.
2. examples of molecule of compound is water and hydrogen
example of molecule of element is oxygen and chlorine
3. atoms combine to form a molecule because it can't excit of their own
4. correct symbol of magnesium is Mg
5. crystallisation
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