Question

Which of the following conditions is necessary for a chemical reaction?
2 points
A) It must be accompanied with change in temperature and pressure.
B) At least one of the reactants must be in a fixed quantity.
C) It must follow the law of conservation of mass.
D) All of the above​

Answer 1

conditions necessary for a chemical reaction are : 1- a minimum amount of energy 2-the molecules or atoms of the reactants must collide with one another 3- the speed of the reaction should be appreciable 4- the rate of reaction depends on: 1- temperature 2- presence of light 3- electricity 4- pressure .

Answer 2

Among the following, the conditions necessary for a chemical reaction are: It must be accompanied by a change in temperature and pressure, at least one reactant must be present in fixed quantity, it must follow the law of conservation of mass. Thus, the correct option is D) All of the above​.

Explanation:

• When two or more chemical substances react to form one or more new compounds that have a different molecular composition from the reactant, it is called a chemical reaction.
• A chemical reaction is identified by a change in temperature and pressure, change in colour, change in state and evolution of gas or energy.
• For a chemical reaction, it is necessary that at least one of the reactants must be in a fixed quantity.
• The law of conservation of mass must be followed in a chemical reaction.
• Thus, all of the given conditions are correct.