Question

Which of the following is an example of an endothermic process?

Answer 1

where are examples LOL

Answer 2

a chocolate bar melting in hot car

a package of fruit freezing in a freezer

burning gasoline in a combustion engine

moisture forming on a glass of iced water

Answer 3

First one

Answer 4

Meliting process is Endothermic

Answer 5

Melting*

Answer 6

ok why wouldn't it be the last one

Answer 7

@chmvijay will explain you

Answer 8

The process of melting is endothermic because you are adding heat (or energy) to the object. When you add heat or energy to an object it begins to melt , Which tells you the object has reached its melting point or the temperature that the object melts at.
endothermic is adding heat or energy (ENdothermic means ENtering)
exothermic is removing heat or energy (EXothermic means EXiting).
Conversely, the process of freezing is exothermic.

Answer 9

oh ok thank you so much

Answer 10

yaaa fourth one is not right bcoz the gas is getting converted to liquid on the surface of iced water :)
conversion of H2O(G)---->H2O (L) is exothermic
and H2O(L) ----> H2O(Gas) is endothermic

Answer 11

Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change of the decomposition of propane?

3 C + 3 O2 yields 3 CO2 deltaH =-1182 kJ

4 H2 + 2 O2 yields 4 H2O deltaH = -1144 kJ

C3H8 + 5 O2 yields 3 CO2 + 4 H2O deltaH = -2222 kJ

C3H8 yields 3 C + 4 H2 deltaH = ? kJ

(-1182) - [(-2222) + (-1144)]

(-2222) - [(-1182) + (-1144)]

(-1182) +(-1144) + (-2222)

(-2222) + (-1182) - (-1144)

Answer 12

ask question in new dialogue box let all see it :)

Answer 13

I'm new how do i post questions to a new dialogue box?

Answer 14

just close this question first and then u post new one u have to wait for some time :)

Answer 15

ok thank you :)