Define effervescence .
The formation of gas bubbles in a liquid during a reaction is called effervescence .
ICSE
What is a Negative catalyst ?
A catalyst employed to retard the rate of reaction is known as a negative catalyst .
What is the positive catalyst ?
When catalyst accelerate the rate of reaction , it is known as a positive catalyst.
What are Promoters?
Substances that infulence the rate of a chemical reaction by improving the efficiency of the catalyst are called promoters.
What are Collisions ?
It occurs when reactants are in close contact or by supply of energy.
What are chemical reaction ?
It is a process of breaking the chemical bonds of the reacting substances and making new bonds to form new substances.
What are chemical change ?
A chemical chnge is a permanent change in which the chemical composition of a substance is changed.
Why should an equation be balanced ?
An equation must be balanced in order to comply with the “Law of Conservation of Matter”,which states that matter is neither be created nor be destroyed in the course of a chemical reaction. An unbalanced equation would imply that atoms have been created or destroyed.
What are Balanced equation ?
The total number of atoms of each element in the reactants, on the left side of the equation , is the same as the number of atoms in the products formed , on the right side of the equation .
What are Products ?
A chemical equation tells us what are the substances formed as a result of the reaction is calle products.