Q.1. Fill in the blanks
1. The formula of one molecule of ferrous sulphide is
2. A chemicalis a statement that describes a chemical change in terms of Symbols and formulae.
3. A word equation represents a chemical reaction briefly in
4. The charge on one proton is taken as unit charge.
5. All chemical reactions take place either by absorption or release of energy in form of
energy.
6. When chlorine atom a unit negative charge, it is called chlorine ion.
7. When a chemical takes place in matter, we commonly say chemical reaction take place.
8. The number of atom which constitute one molecule of an element is called its
9. gas burns with a pop sound.
10. For all practical purpose, an electron is regarded as
Answers
Answer
1. The chemical formula of ferrous sulphate is FeS
in common name is known as iron( ii) sulphide
2. A chemical equation is a statement that describes a
chemical change in terms of formula and symbols
3. the word equation shows briefly in a chemical
equation is that the reactants are shown in left side
and the products are shown in right side and in the
medium such as any catalysts , temperature are
indicates in arrow mark.
4. the charge on proton is positive denoted by +1e .
which is equals to 1.602 × 10^ minus 19 coulombs.
5. The chemistry reactions which absorbs energy are
called – Endothermic reactions
the chemical reactions which releases energy are
called – Exothermic reactions
6. the chlorine ion exhibits negative energy is called
Anion.
7. We say that the chemical reaction takes place in
laws of conservation of reaction .
8. Atomicity is the total number of atom which
constitutes of an element
9. The Hydrogen is a gas which forms pop sound when
a matchstick puts near to test tube filled with fumes
of hydrogen gas.
10. For all practical purposes, an electron is regarded as
fundamental unit of charge in nature. which rises the
the Baryons , Mesons and quarks . ( building blocks
of protons ).
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