Question

Select the factors that influence the rate of a chemical reaction. a. altering the concentration of reactants in the vessel b. changing the temperature of the reaction c. modifying the surface area of reactants d. switching to a vessel made of a different material e. adding a catalyst to the reaction

Answer 1

a. altering the concentration of reactants in the vessel

b. changing the temperature of the reaction

c. modifying the surface area of reactants

e. adding a catalyst to the reaction

Step-by-step explanation:

The rate of a chemical reaction refers to how fast reactants are converted into products. Certain important factors affect the rate of chemical reaction.

According to the collision theory, reaction occurs due to collision between particles. Hence increasing the concentration or amount of particles present increases the rate of reaction.

It is known that for every 10°C rise in temperature, the rate of reaction doubles. Hence temperature affects the rate of reaction.

Reaction has tondo with interaction of particles. The greater the surface area of reactants available for chemical interaction, the faster the rate of reaction. Hence finely divided solids react faster than solid lumps.

A catalyst increases the rate of reaction by lowering the activation energy (energy barrier) of a reaction.

The nature of the reaction vessel has absolutely nothing to do with the rate of reaction.

Answer 2

The correct options are A, B, C and E

Step-by-step explanation:

Chemical reaction is the process by which different components of reactant molecules are converted to new components called products.

The rate of a chemical reaction is the speed at which reactants are being converted to products per unit time. This is affected by the following main factors which includes:

- Reactant concentration,

- physical state of the reactants and surface area,

- temperature and,

- the presence of a catalyst.

Therefore, altering the concentration of reactants in the vessel, changing the temperature of the reaction, modifying the surface area of reactants and adding a catalyst to the reaction influences the rate of a chemical reaction.