Endothermic/exothermic True or False Qs.?

Question

1. Heating ice is an endothermic process which increases the internal energy of the system

2. Evaporation is an endothermic process because the system is absorbing energy.

3. The water in the system is undergoing a reversible process at 273K and 1 atm pressure. Under these conditions, both melting and freezing may occur.

4. Condensation is an exothermic process because the system gives off energy.

5. The melting of ice is an exothermic process because the system absorbs energy.

6.The freezing of water is an endothermic process because the system absorbs energy.

7. As steam condenses, the surroundings are absorbing energy from the system.

I said 1,2,3,4 are trues and 5,6,7 are falses.
But these are wrong answers.
Could anyone please help me with this ASAP??
(by monday(2/12/2007) 9pm)

Thank you very much

Answer 1

1. Well heating something will increase the energy of the system, so it is endothermic. The actual heating process (ie fire) is exothermic bc it is giving off energy in the form of heat.

2. Evaporation is a cooling process, and it occurs by molecules of whatever liquid is evaporating leaving the liquid, so the energy decreases and it is therefore exothermic.

3. Well 273 is the freezing point so i guess both melting and freezing are occuring in equilibrium...though im not sure on that one.

4. Condensation is endothermic bc the system is absorbing energy from whatever is condensating.

5. melting is exothermic because the system gives off energy, not absorbs it

6. This is true.

7. I think the surroundings are absorbing energy from the system, that is whatever is condensing is giving off energy to whatever it is condensing on, which absorbs energy.

Hope this helps

Answer 2

I answer only the questions I am sure.

1 and 2 are true since the system receives energy

3 it is irreversible

4 seems exothermic

5 is endothermic

6 is exothermic, the system gives energy

7 is true the system gives energy


Look at my link

Answer 3

3.fake. nicely...i'm surprisingly specific that marine biology isn't purely the study of animals. I say this via fact even however biology is refering to the existence in water that's no longer limeted to animals. it is likewise a study of the flora and different residing issues. additionally that's no longer limited to animals themselves via fact there are a number of non-residing issues which will desire to be taken into consideration that consequence the animals. 4. fake. the version between white blood cells and purple lood cells is that white blood cells help to combat micro organism and purple blood cells carry oxygen to diverse components of the physique.

Answer 4

mhoni is right. Somewhere in your studies, someone should have given you the resources or knowledge to answer these yourself. If you don't know enough to answer them yourself, you aren't going to be able to evaluate other's answers.

Answer 5

refer your book