CHEM 162 exam 3 content

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27 Terms

1

What’s Enthalpy’s general formula?

H = E + (P x V)

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2

What’s ΔE?

q + (-P ΔV)

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3

What’s ΔH equal if pressure is held constant?

q

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4

ΔH is?

H final - H initial

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5

what’s q equal to in relation to ΔH?

q = ΔH = (moles reacted) X ΔHrxn

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6

If ΔH is negative then?

system cools down —> exo

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7

If ΔH is positive then?

system heats up —> endo

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8

ΔH is specific to the amount of?

reaction (moles)

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9
<p>Answer Question</p>

Answer Question

C, because the reaction starts at high and ends in low. The system is losing energy.

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10
<p>What’s A? is it Endo or Exo?</p>

What’s A? is it Endo or Exo?

Melting/Fusion

  • Endo

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11
<p>What’s B? Is it Endo or Exo?</p>

What’s B? Is it Endo or Exo?

Freezing

  • Exo

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12
<p>What’s C? is it Endo or Exo?</p>

What’s C? is it Endo or Exo?

Sublimation

  • Endo

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13
<p> What’s D? is it Endo or Exo?</p>

What’s D? is it Endo or Exo?

Deposition

  • Exo

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14
<p>What’s E? is it Endo or Exo?</p>

What’s E? is it Endo or Exo?

Evaporation

  • Endo

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15
<p>What’s F? is it Endo or Exo?</p>

What’s F? is it Endo or Exo?

Condensation

  • Exo

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16
term image
  1. A

  2. D

  3. A

  4. A

  5. A

  6. D

  7. A

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17
<p>What’s A-E show in phases?</p>

What’s A-E show in phases?

A. Soild

B. Solid → liquid

C. Liquid

D. liquid → gas

E. gas

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18
<p>What does the line C represent? </p>

What does the line C represent?

Phase

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19
<p>What does the line D represent </p>

What does the line D represent

phase change

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20
<p>What formula would you need to use for line C &amp; why? </p>

What formula would you need to use for line C & why?

q= m * cp * ΔT

  • in phase

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21

What formula do you need to use for D & Why?

q= n * ΔH

  • because phase is changing

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22

During the duration of a reaction the q total (heat total) will equal

q1 + q2 + qn (n = amount of times heat changes in corresponding phases)

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23

When Temperature changes what happens to KE?

Changes

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24

When temperature is constant what happens to KE?

KE is constant

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25

PE changes when?

phases changes (flat graph: temperature constant))

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26

PE doesn’t change when?

in phase (slop graph: temperature changing)

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27

What is the 2 rules for manipulating reactions?

  1. if you flip reactions (making the reactants to products instead) you must change the sign of ΔH

  2. What you multiply reaction by is what you multi ΔH by.

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