Label each of the following as endothermic or exothermic
A.) Products are more stable than reactants
B.) Kinetic energy is converted into potential energy
C.) Evaporation
D.) Combustion
E.) Water freezes
F.) Heat seems to disappear
And you think what? and why?
Well, I think that A is exothermic because I know for a fact that in an exothermic chart the products are always lower in P.E than the reactants. I'm really not sure about all of the other questions though.
I think you're right about A.
Wouldn't you need to work to make KE into PE?
C. To evaporate H2O you must add heat so that must be endo.
D. If you burn a piece of wood that is combustion. It gets hot, right? So that must be?
E. When water freezes it is exothermic. No, I didn't make a typo.
ice + heat ==> liquid H2O which is endothermic, right? So the reverse of that must be exothermic.
F.I don't know how to interpret F.
To determine whether each of the following processes is endothermic or exothermic, we need to understand the concept and characteristics of these terms:
- Endothermic: A process that absorbs heat energy from the surroundings. In an endothermic process, the products have a higher energy level than the reactants, meaning energy is being absorbed and stored.
- Exothermic: A process that releases heat energy into the surroundings. In an exothermic process, the products have a lower energy level than the reactants, meaning energy is being released.
Now let's examine each process:
A.) Products are more stable than reactants:
This statement alone does not provide enough information to determine if it is endothermic or exothermic. Stability may involve various factors and is not directly related to heat exchange.
B.) Kinetic energy is converted into potential energy:
When kinetic energy is converted into potential energy, it implies that energy is being absorbed, stored, or increased. Therefore, this process is endothermic.
C.) Evaporation:
Evaporation refers to the phase change of a liquid into a gas. To change the state from a liquid to a gas, energy is required to break the intermolecular forces. This energy is usually provided by absorbing heat from the surroundings. Therefore, evaporation is an endothermic process.
D.) Combustion:
Combustion involves a chemical reaction where a fuel combines with oxygen and releases energy in the form of heat and light. Since energy is being released, combustion is an exothermic process.
E.) Water freezes:
Freezing is the process of liquid water changing into ice. During freezing, heat is released into the surroundings as the water molecules slow down and form ordered ice crystals. Therefore, water freezing is an exothermic process.
F.) Heat seems to disappear:
If heat seems to disappear, it implies that energy is being absorbed or stored but is not visible or detectable. This phenomenon usually occurs in endothermic processes.
In summary:
- Endothermic processes: B) Kinetic energy is converted into potential energy and F) Heat seems to disappear.
- Exothermic processes: C) Evaporation, D) Combustion, and E) Water freezes.
- A) Products are more stable than reactants does not provide enough information to determine endothermic or exothermic.