why does the temperature in an exothermic reaction increase, reach a maximum temperature and then decrease.?

Answer 1

once the reaction is over it will cool to ambiant temp...or even if it's not through reacting it will begin to cool beacause the surrounding area absorbs more heat than is being produced by the smaller quantity remaining that is still reacting.

Answer 2

The temperature of a system is simply a way of quantifying the amount of energy in the system. In an exothermic reaction, you must first over come a energy "barrier" known as the activation energy. This is why the temperature first increases. However, not all exothermic reactions require this step of "activation", but in your case that is the only way to get the temperature of the reaction to increase and reach a maximum. What defines an exothermic reaction, however, is that the final temperature of the product is less than the temperature of the reactants (ie the reaction gives off heat). This is simply saying that the energy of the system at the end of the reaction is less than the energy of the system before the reaction. Thus the temperature decreases.

Answer 3

Exothermic reactions give off heat. Initially they give it off to a cool substance. They heat it. As they heat it the cooling force increases due to the temperature difference between the mass in the reaction and the environment. At some point the cooling force equals the heating and the reaction reaches maximum temperature. After this the reaction rate is decreasing and the cooling force exceeds heating and the reaction cools. Got it?

Answer 4

An exothermic reaction's heat generated is a function of the reaction rate. As the reaction speeds up, temperature increases. As is slows, temperature decreases.

Answer 5

as quickly as the temperature of the water starts to chop back consequently of the reaction, the equipment will then take in warmth from the environment until the reaction equipment and the environment are on a similar temperature (are at thermal equilibrium). in view that warmth ENTERED the reaction equipment, the sign of q is effective and the reaction is stated as endothermic. on the different hand, q for the environment is unfavorable in view that warmth LEFT the environment to pass into the reaction equipment. in case you dissolve NaOH in water, the temperature straight away will enhance. Then this warmth is transferred to the environment (the chillier merchandise) until thermal equilibrium is reached. The reaction is exothermic (q for the reaction is unfavorable in view that warmth became misplaced).

Answer 6

Exothermic reactions give out heat, so they will reach a maximum before natural cooling commences.

Answer 7

Energy is released the the temperature increases. As the reaction proceeds reactants are used up. As the reactants are eventually lower in concentration there are fewer that react??

Answer 8

Heat is released which is absorbed.