Question

CHEMICAL REACTION AND EQUATIONS

Q1. What is a balanced chemical equation?

Q2. “We need to balance an unbalanced skeletal chemical equation”. Justify the statement.

Q3. Giving an example list two information which make a chemical equation more useful.

(informative).

Q4. Define the following :

(a) Chemical Reaction

(b)Chemical Equation

Q5. Distinguish between : Physical Change and Chemical Change.

Q6. What us the importance of a chemical equation?

OR Give significance of a chemical equation.​

Answer 1

Answer:

question 1

Explanation:

a balanced chemical equation is a type of equation which we have to balance by making the molecules equal on both the reactant and product side by multiplying with the nos. for eg:-2h2 +o2= 2h2o

Answer 2

1) In which reactants and products side atoms or molecule have equal no.of atoms, equal weight on both the sides is known as balanced chemical equation.

2) Due to the law of conservation of mass. That's why there is need to balance the chemical equation if it is unbalanced.

3) i) The state of the reactant and product it is either solid, liquid or gas.

* g for gases.

* s for solids.

* aq for Aquos solution.

* l for liquids.

ii) If gas we use up arrow sign and if precipitate we use down arrow.

EXAMPLE-- H2(g) + O2(g) ------------> 2H2O(1)

4) Chemical Reaction--- in which two or more substances react with each other to give the product.

Chemical Equation----it is symbolic representation of a chemical reaction in the form of symbols and formulas.

5) Physical change -- in this change no new sybstance will formed and it is reversible change.

Chemical change -- in this change new substance will form and it is irreversible change.

6) Chemical equation gives information about the changes occurred in a chemical reaction.it saves time and space in writing.

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