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STD-X, SCIENCE
CHAPTER-1
CHEMICAL REACTIONS AND
EQUATIONS
CHEMICAL REACTION:- It is a process in which
one or more substances react to form a new
substance/substances. So, how can we know
a chemical reaction has been taken place?
THE CHEMICAL REACTIONS
HAPPENING IN OUR DAILY LIFE
• 1.Digestion of food
• 2. Respiration
• 3. Rusting of Iron
• 4.Formation of curd
• Note:- All chemical reactions obey the two
laws of chemical reactions, which you read in
std-9th .1. Law of conservation of mass 2. Law
of constant proportions.
CHEMICAL REACTIONS INVOLES
• 1. Change in state
• 2. Change in colour
• 3. Change in temperature
• 4. Evolution of gas
• Note:-Chemical substances can’t be reversed
by physical methods like-
1. Magnetism 4. Distillation
2. Filtration 5. Evaporation
3. Centrifugation
ACTIVITY1.2 AND 1.3 ARE EXAMPLE TO UNDERSTAND
THAT DURING CHEMICAL CHANGE THE EVOLUTION OF
GAS AND CHANGE IN COLOUR
