a. Reactants and products.
Reactants | Products |
The chemicals that undergo chemical changes are reactants. | The chemicals that are formed as a result of the reaction are products. |
These are the chemicals before the reaction between them occurs. | These are the chemicals after the reaction between them occurs. |
b. Word equation and formulae equation.
Word | Formulae |
It is the representation of chemical equations by words. | It is the representation of chemical equations by symbols. |
It is less informative. | It is more informative. |
It is longer and non-convenient. | It is shorter and convenient. |
c. Combination reaction and decomposition reaction.
Combination | Decomposition |
In this reaction, different reactants are combined to form a single product. | In this reaction, a single reactant is decomposed to form multiple products. |
It occurs either in the presence or absence of heat. | It occurs in the presence of heat only. |
d. Positive catalyst and negative catalyst.
Positive | Negative |
It increases the rate of a chemical reaction. | It decreases the rate of a chemical reaction. |
It is used to accelerate the reaction. | It is used to slow down the reaction. |
Mn02 is an example. | Glycerine is an example. |