Which of the following is true about the relationship between energy and chemical reactions?
Activation energy is required for a chemical reaction to occur.
Activitation energy is not necessary in a chemical reaction which releases energy.
Chemical bonds are always broken by energy absorption in a chemical reaction.
Energy-absorbing reactions don't occur in chemical reactions.
I know that Eact is needed to obtained first before a chemical rxn can occur... the nrg absorption parts, I don't know.
~Terry
the first statement is true.
there are reactions which require energy for activation and reaction proceeds with the evolution of energy.
chemical bonds MIGHT NOT be always broken by energy absorption. the amount of energy depends on the nature of reactants.
moreover there are a horde of examples where energy absorbing reactions occur.
HOPE THIS HELPS!!!!
The correct statement about the relationship between energy and chemical reactions is:
Activation energy is required for a chemical reaction to occur.
To determine which statement is true about the relationship between energy and chemical reactions, we will evaluate each statement.
1. Activation energy is required for a chemical reaction to occur.
This statement is true. Activation energy refers to the minimum amount of energy needed to initiate a chemical reaction. Without sufficient activation energy, the reaction will not proceed. This energy barrier ensures that only reactions with enough energy can occur.
2. Activation energy is not necessary in a chemical reaction which releases energy.
This statement is false. Even in exothermic reactions, where energy is released, there is still an activation energy barrier that must be overcome for the reaction to begin. The reaction may release more energy than is needed to reach the activation energy, but it still requires an initial input of energy to start the reaction.
3. Chemical bonds are always broken by energy absorption in a chemical reaction.
This statement is false. In a chemical reaction, energy can be either absorbed or released. Breaking chemical bonds requires energy absorption, but the overall reaction can involve both breaking and forming bonds. Some reactions can release more energy during bond formation than is required to break the initial bonds, resulting in a net release of energy.
4. Energy-absorbing reactions don't occur in chemical reactions.
This statement is false. Energy-absorbing reactions, also known as endothermic reactions, do occur in chemical reactions. These reactions require an input of energy to proceed and typically involve the absorption of heat from the surroundings.
In summary, the correct statement is:
Activation energy is required for a chemical reaction to occur.