The language of chemistry

Created by

Mitali Shedge

Cards (20)

What are symbols?
A symbol is a short form used for representing an element.
what does a symbol of an element represent?
symbol of an element represents that element and its atomic mass
what is valency? 
valency is the combining capacity of an element with hydrogen atom.
what is valency in case of metals?
in case of metals valency is the number of electrons lost by per atom of metal
what is valency in case of non-metals?
in case of non metals valency is the number of electrons gained by per atom of non-metal
why do elements exhibit variable valences?
few electrons have variable valency because the electrons can take part in bonding from the outermost shell and the penultimate shell due to lower energy gap.
give two examples of elements that exhibit variable valency.
cu - 1+, 2+
Ag - 1+, 2+
what is a chemical formula?
chemical formula is a short and convenient way to represent compounds using symbols or formula.
what are radicals?
radicals are a group of atoms which are either negatively or positively charged and behave like a single unit.
give two examples of positively charged radical.
NH4 1+
H₃O⁺
name any two basic radicals.
NH4 1+
H₃O⁺
name any two negative radicals.
OH¯
SO₄²-
name any two acidic radicals.
OH¯
SO₄²-
what is a compound?
when atoms of two or more elements combine in fixed proportion the resultant substance is known as compound.
what is a mixture?
when two or more elements are mixed in any proportion it is known as a mixture.
what is a chemical reaction?
the process of chemical change in which reactants react together to form a new substance called product is known as chemical reaction
what is a chemical equation?
chemical equation is a short and convenient way of representing a chemical reaction by using symbols and chemical formulas.
what is relative atomic mass?
mass of one atom of element in comparison to 1/12th of mass of C-12.
what is relative molecular mass?
mass of one molecule of any compound in comparison to 1/12th of mass of C-12
what is atomicity?
number of atoms present in a molecule