Question

When two aqueous solutions are mixed together, the temperature of the solution decreases. What statement best describes this reaction?

The reaction is exothermic with a negative enthalpy change.

The reaction is endothermic with a negative enthalpy change.

The reaction is exothermic with a positive enthalpy change.

The reaction is endothermic with a positive enthalpy change.

Answer 1

@Abhisar

Answer 2

@miraclemilktea2 ?

Answer 3

@JoannaBlackwelder ?

Answer 4

A reaction in which heat energy is given off is said to be exothermic, temperature increases.
A reaction in which heat energy is absorbed is said to be endothermic, temperature decreases.

Answer 5

oh yeah how could i forgot hahah. when temp decreases is is exothermic. I was confused about the positve and negative enthalpy change so. b and d can't be it. i was thinking The reaction is exothermic with a positive enthalpy change. Now i am think The reaction is exothermic with a negative enthalpy change.
is that right???

Answer 6

nope it is not exothermic its endothermic,the products have a higher energy than the reactants. The system absorbs this extra energy as heat from the surroundings so temperature decreases, exothermic cant have a positive enthalpy its always a negative sign. so endothermic reaction do have a positive sign

Answer 7

oh that is a boo boo on my end
so are you saying that it's The reaction is endothermic with a positive enthalpy change.
?

Answer 8

yes.

Answer 9

^ thanks!