Question

for number 1 what if it was not in a insulated system but the opposite? and for 3 what if it was enthalpy instead? for 2 you could explain if you want to but im more curious on 1 and 3

AWhich of matter and energy is transferable in an insulated system? b) energy e) matter and energy dneither matter Which of the following material is a typical inert electrode not made from? Graphite d) Gold b) Platinum ron Which of the following shows an increase in entropy? a) precipitation Dissolution d) freezing b) condensation

Answer 1

1)

Answer : d) neither.

Explanation :

insulated systems does not transfer energy or matter .

for example : if you pour tea in an insulated flask and closed , then no exchange of heat or matter.

2)

Answer : c) Iron

Explanation :

inert electrode is a electrode that serves only as a source or sink of electrons . without playing chemical role in electrode reaction .

inert electrodes are made commonly as : carbon (graphite) , platinum , gold .. etc

3)

Answer : c) dissolution

Explanation :

a) precipitation is the formation solid from the aquoues solutions . In solids , molecules are very closely packed. so no randomness .so entropy is decreases.

b) condensation is the conversion of vapor to liquid. molecules randomness is more in vapor state than liquid state.

so here also entropy decreases.

d) freezing is the conversion of liuid to solid. liquid to solids , molecules movement is very less .so entropy decreses.

in only dissolution of a solute increses the entropy . because spreading the solute molecules in a large volume of solvent. so randomness and movement of molecules increase.so entropy increases.