Chemical Reactions

Question 1

What are some evidences of chemical reactions?

Answer 1

Changing color, change in order, change in must’ve volume, formation of a gas or gas bubbles, formation of a precipitate in solution, temperature, change, production of lights or sound.

Question 2

What is the formula for rates of chemical reaction? 

Answer 2

Changing amount of reactant or product divided by time taken.

Question 3

What are some of the factors affecting the rate of chemical reaction?

Answer 3

1. Concentration of reactants
2. Temperature
3. Presence of catalyst
4. Pressure
5. Surface area or particle size
6. Light intensity
7. Presence of activators. 

Question 4

What are reversible reactions?

Answer 4

Reversible reaction is a reaction in which the reactants react to form Products, and at the same time the products formed react to form back the reactants depending on the reaction conditions

Question 5

What is chemical equilibrium?

Answer 5

This is a state in which the state of forward reaction balances with the rate of backward reaction

Question 6

Explain the haber process

Answer 6

During the Haber process, nitrogen, gas reversibly reacts with hydrogen gas to form ammonia gas

Question 7

What are the steps in the contact process?

Answer 7

1. Sulfur dioxide (SO2) and air is passed over vanadium(v)oxide (V2O5)catalyst at 450 degrees at 1-2 atmospheres
2. Sulfur trioxide (SO3) formed in absorbed by concentrated sulfuric acid ( H2 SO4) in an absorption tower to form oleum( H2 S2 O7)
   Equation: SO3 + H2SO4> H2S2O7
3. Oleum is diluted to form 98% concentrated and 2% diluted sulphuric acid.
   Equation: H2S2O7 + H2O> 2H2SO4