Term
Exothermic
1. Which side is the kcal located on in a formula
2. Is heat released or absorbed?
3. Would the dH be negative or positive?
4. Is it when a bond breaks of forms?
5. Does it feel warm or cold? |
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Definition
1. Kcal is on the right side
2. Heat is released
3. The dH would be negative
4. When a bond forms
5. It feels warm |
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Term
Endothermic
1. Which side is the kcal located on in a formula
2. Is heat released or absorbed?
3. Would the dH be negative or positive?
4. Is it when a bond breaks of forms?
5. Does it feel warm or cold? |
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Definition
1. The kcal is on the right side
2. Heat is absorbed
3. The dH would be positive
4. When a bond breaks
5. It feels cold |
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Term
Enthalpy
1. What is the symbol?
2. What is the formula?
3. What does it measure?
4. What unit is it? |
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Definition
1. dH
2. products minus reactants
3. change in heat content
4. kcal/mole |
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Term
Entropy
1. What is the symbol?
2. What is the formula?
3. What does it measure?
4. What unit is it? |
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Definition
1. dS
2. products minus reactants
3. disorder, or lack of org.
4. cal/deg-mole |
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Term
Free energy
1. What is the symbol
2. At 25 degrees celsius what is the formula?
3. What is the formula for any temperature?
4. If the dS is positive does it decrease of increase in disorder?
5. If the dG is negative is it spontaneous or not?
6. What are the units?
7. Spontaneous or not?
a) dH is negative and dS is negative
b) dH is negative and dS is positive
c) dH is positive and dS is positive
d) dH is positive and dS is negative
Hint:
1. Remember to divide dS by 1000 since it is cal and not kcal
2. Remember to add 273 to the temperature since it is cesius and not kelvin |
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Definition
1. dG
2. products minus reactants
3. dG=dH-TdS where T is Kelvin
4. if dS is positive then it increases in disorder
5. If dG is negative then it is spontaneous
6. the units are kcal/mole
7. a)Spontaneous at low temp
b)Spontaneous at all temp.
c)Spontaneous at high temp.
d)Not spontaneous at all temp. |
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Term
Ex.
1/2(N2g)+ O2g+8 kcal >> NO2g
What is the dH?
2(NO2g)>>_______________ finish(include kcal)
What is the dH? |
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Definition
8 Kcal/mole
2(NO2g)>>N2+2(O2)+8 kcal
dH=-16 Kcal/mole |
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Term
Is Entropy increasing or decreasing?
1)H2Og>>H2O l
2)H2O is heated from 10degrees celsius to 30 degrees celsius
3)(Ag+)aq+(Cl-)aq>>>AgCl (s)
4)Ice melts |
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Definition
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