Atoms and Molecules Flashcards
1
Q
define chemical equation
A
the symbolic representation of actual chemical reaction
2
Q
Define molecular formula
A
The symbolic representation of a molecule of an element or compound which shows the number of atoms in it
3
Q
define symbol
A
abbreviation of full name of element
4
Q
define valency
A
the combining capacity of the element which is measured in terms of the numbevr of valence electrons
5
Q
list the essentials of chemical reactions
A
it should be practically accurate
it should be balanced
6
Q
list the limitations of the chemical equation
A
physical state of elements are unknown concentration of elements are unknown condition of elements are unknown thermal change is unknown speed of reaction is unknown mechanism of reaction is unknown
7
Q
describe the types of reactions
A
. addition reaction . decomposition reaction . single displacement reaction .double displacement reaction . hydrolysis reaction
8
Q
write the molecular formula of
- washing soda
- baking soda
- bleaching powder
A
- na2co3 10h20
- nahso3
- caocl2
