Which term is used to describe the energy needed for a chemical reaction to begin? (1 point)
potential energy
activation energy
kinetic energy
bond energy
Which statement is always true for exothermic reactions? (1 point)
Energy will not be required for the reaction to happen at room temperature.
The products will have less energy than the reactants.
The products will have more energy than the reactants.
Energy will be required for the reaction to happen at room temperature.
Which energy change occurs for a water molecule as water falls over a dam?(1 point)
total energy increases
kinetic energy decreases
total energy decreases
kinetic energy increases
Answers
Answer:
1. Activation energy.
2. The products will have less energy than reactants.
3. Kinetic energy increases.
Explanation:
1. The energy which is needed for chemical energy to begin is the Activation energy.
As because, we know that activation energy is the minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction.
2. The statement which is always true for exothermic reactions is that the products will have less energy than the reactants.
This is because, in an exothermic reaction, heat has been released to the surroundings from the system. As a result, the molecules are at a lower final energy state after releasing the energy to the surroundings.
3. When water falls over a dam its kinetic energy increases.
When the water falls over a dam, the dam converts the potential energy stored in a water reservoir behind a dam to mechanical energy- mechanical energy is also known as kinetic energy.
1. Activation energy.
2. The products will have less energy than reactants.
3. Kinetic energy increases.
1. The energy which is needed for chemical energy to begin is the Activation energy.
As because, we know that activation energy is the minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction.
2. The statement which is always true for exothermic reactions is that the products will have less energy than the reactants.
This is because, in an exothermic reaction, heat has been released to the surroundings from the system. As a result, the molecules are at a lower final energy state after releasing the energy to the surroundings.
3. When water falls over a dam its kinetic energy increases.
When the water falls over a dam, the dam converts the potential energy stored in a water reservoir behind a dam to mechanical energy- mechanical energy is also known as kinetic energy.
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