Which Of These Changes Produces The Greatest Increase In Entropy

This is considered to exist the degree of disorder of a system. Gas particles have random move take high entropy values. Liquids have much lower entropies and solids lower still. Solutions accept a greater entropy than pure liquids every bit the particles in a solution are more than separated and solvent molecules separate the solute particles.

If the number of moles of gas increases in a chemical reaction (every bit shown by the stoichiometry of the reaction) then the entropy too increases.

In this case there are 2 moles of gas on the right hand side and only one mole of gas on the left paw side - the entropy increases going from left to right (reactants to products).

Disorder can besides arise past mixing dissimilar components. For instance a mixture of ii unlike gases volition have greater entropy than the sum of the entropies of the 2 gases alone.

The entropy change of a reaction is given the symbol ΔS, units when used are J/mol Yard (not kJ).

***Entropy increases will be observed when any 1 or more of the post-obit occur:

Examples-Highlight the boxes to reveal the answer and reasoning.

September vi, 2000 -Christian Right Lobbies To Overturn 2d Police Of Thermodynamics

By Regents Questions on Entropy

Jan 2010 44 Given the balanced equation representing a phase modify:
C₆H₄Cl_{ii(southward)} + energy==>C₆H_fourCl_{two(one thousand)}
Which statement describes this change?
(ane) Information technology is endothermic, and entropy decreases.
(ii) Information technology is endothermic, and entropy increases.
(3) It is exothermic, and entropy decreases.
(iv) Information technology is exothermic, and entropy increases.

Aug 2009- 45 The entropy of a sample of H₂O increases equally the sample changes from a
(1) gas to a liquid (three) liquid to a gas
(2) gas to a solid (4) liquid to a solid

_{June 2008-} 45 Which 1-mole sample has the least entropy?
(i) Br_2(s) at 266 K (3) Br_ii(l) at 332 One thousand
(ii) Br_ii(l) at 266 K (four) Br_2(g) at 332 K

June 2008- 17 A thermometer is in a chalice of water. Which statement best explains why the thermometer reading initially increases when LiBr(southward) is dissolved in the h2o?
(one) The entropy of the LiBr(aq) is greater than the entropy of the water.
(2) The entropy of the LiBr(aq) is less than the entropy of the water.
(3) The dissolving of the LiBr(south) in water is an endothermic process.
(4) The dissolving of the LiBr(south) in water is an exothermic process.

Jan 2007-27 In terms of energy and entropy, systems in nature tend to undergo changes toward
(1) higher energy and higher entropy
(two) higher free energy and lower entropy
(3) lower energy and higher entropy
(four) lower free energy and lower entropy

Aug 2006- 49 Which list of the phases of H₂O is bundled in order of increasing entropy?
(one) ice, steam, and liquid water
(2) ice, liquid h2o, and steam
(3) steam, liquid water, and ice
(4) steam, ice, and liquid h2o

Jan 2006- viii Given the balanced equation:
I_2(s)+ energy ==> I_ii(yard)
Every bit a sample of I_2(s) sublimes to I_2(thousand), the entropy of the sample
(one) increases because the particles are less randomly arranged
(2) increases because the particles are more randomly arranged
(3) decreases because the particles are less randomly arranged
(iv) decreases because the particles are more randomly arranged

Aug 2005- 46 At STP, a sample of which element has the highest entropy?
(ane) Na_(s) (3) Br_ii(l)
(ii) Hg_(l) (4) F_2(g)

June 2005- 20 Systems in nature tend to undergo changes toward
(i) lower energy and lower entropy
(2) lower energy and college entropy
(3) college energy and lower entropy
(4) college energy and higher entropy

Jan 2005- 43 Which of these changes produces the greatest
increase in entropy?
(i) CaCO_3(s) �--> CaO_(southward) + CO_2(yard)
(two) 2 Mg_(s) + O_two(1000) �--> 2 MgO_(s)
(3) H_twoO₍₁₀₀₀₎ �--> H₂O₍₅₀₎
(4) CO_{two(thousand)} �--> CO_2(s)

Aug 2004- 21 Fifty-fifty though the process is endothermic, snowcan sublime. Which tendency in nature accounts for this stage change?

(1) a tendency toward greater entropy

(two) a trend toward greater energy(3) a trend toward less entropy (4) a trend toward less energy

_{Jan 2004-}

June 2005-

June 2008- 22 Systems in nature tend to undergo changes toward
(ane) lower energy and less disorder
(ii) lower energy and more disorder
(3) higher energy and less disorder
(4) higher energy and more than disorder

June 2004-