HESS'S LAW
THEORY
Limiting Reactants
HEAT TRANSFER AND ENTHALPY CHANGE
SPECIFIC HEAT
Bond Energy
Enthalpy of Formation
Mixed Practice
Mixed Review
Mixed Review
States
Baseball
Who sang?
Food
Drink
Who are you?
100

What is the enthalpy for the following goal equation?

PCl5(g) → PCl3(g) + Cl2(g)


Using the following information: 

| P4(s) + 6Cl2(g) → 4PCl3(g) ΔH = -2439 kJ

| 4PCl5(g) → P4(s) + 10Cl2(g) ΔH = 3438 kJ |

What is 249.8 kJ

100

The value of the ΔH for any reaction that can be written in steps equals the _____of the value of ΔH for each of the individual steps

What is sum

100

What is the maximum amount of energy that could be produced from the reaction of 85.0 grams of Aluminum with 95.0 grams of oxygen, according to the following reaction?

   4 Al + 3 O2 -> 2 Al2O3  H = -3352 kJ


What is -2638.14 or -2640 kJ

Aluminum is the limiting reactant 

100

Is ΔH positive or negative in an exothermic reaction?

What is negative.

100

How much heat, in joules, would be required to raise the temperature of 450 g of Aluminum (0.900 J/g0C) from 19.50C to 31.20C?

4738.5

100

100


100

How many J would it take to raise the temperature of 200 grams of water from 5 oC to 85 oC?

Q = (200 g)(4.18)(80 oC) = 66880 J

100

B

C

E

F

A

D

100

E

100

Hunstville

Montgomery

Birmingham

Alabama 

100

What are the four teams left in the MLB playoffs?

Houston Astros

Philadelphia Phillies

Texas Rangers

Arizona Diamondbacks


100

Aerosmith

100

Which country invented Gazpacho?

Spain

100


Samuel L Jackson

200

What is the change in enthalpy for the following goal equation? 

 CS2 + 2 H2O --> CO2 + 2 H2S

Given the following information:

 H2S + 3/2 O2 --> H2O + SO2  ΔH = -563 kJ 

CS2 + 3 O2 --> CO2 + 2 SO2     ΔH = -1075 kJ


What is 51 kJ

200

When an equation is reversed- the sign of ΔH must also be _________________.

What is reversed

200

How much heat will be transferred when 0.54g of sulfur reacts with 0.54g of oxygen to produce sulfur trioxide according to the following reaction:

2 S + 3 O2 -> 2 SO3 + 790kJ


What is -4.4 kJ


Oxygen is the limiting reactant 

200

On a sunny spring day, while walking on the sidewalk near your house, you notice a puddle. Next to the puddle you see a fire hydrant. Which one is warmer to the touch? Do you know why? Assume each object received the same amount of sunlight.

Hydrant is warmer because it is made of metal. Metals conduct heat better than water. (Specific heat is metal is lower than water)

200

How much heat (in Joules) is needed to raise the temperature of 257g of ethanol (cethanol=2.4 J/g°C) by 49.1°C

30284.88 Joules

200

200


200

What would the final temperature be if 500 J are applied to 150 grams of ice at –90 oC?

500 J = (150 g)(2.06)(x – (-90 oC)) =-88.4 oC

200

A

E

D

B

C

200

A

200

Little Rock

Fayetteville


Arkansas


200

What is the name of the Manager of the Houston Astros?

Dusty Baker

200

Lady Gaga

200

Kimchi is a popular side dish from where?


Korea

200


Denzel Washington

Johnny Depp

300

What is the change in enthalpy for this goal equation? 

 NO + O --> NO2

Given the following information:

2 O3 --> 3 O2  ∆H = -427 kJ

O2 --> 2 O      ∆H = +495 kJ

NO + O3 --> NO2 + O2        ∆H = -199 kJ


What is -233 kJ

300

If all coefficients of an equation are multiplied or divided by the same factor, the value of ΔH must likewise be ______________________.

What is multiplied or divided by the same factor

300

 How much heat will be absorbed when 38.2 g of bromine reacts with 12.4g of hydrogen according to the following equation? Which is the limiting reactant? 

H2 + Br2 + 72.80  ->  2HBr


What is +17.4 kJ


Bromine

300

In an endothermic reaction, is heat gained or lost in the system? Draw a graph to illustrate the transfer of energy in an exothermic reaction. 

What is gained, reactants--> products. Graph should show energy increasing in the system (solution gains/absorbs heat)

300

What mass of iron (ciron= 0.11 cal/g°C) would need 1450 cal of energy in order to raise its temperature by 19.7°C

670 g

300

300

300

Octane, the major component in gasoline freezes at –57 oC and boils at 125 oC. If gaseous octane was cooled from 200 oC to –100 oC, draw what the graph would look like:

300

B

C

300

D

300

Bridgeport

Stamford

New Haven

Connecticut

300

Who is this pitcher from the Astros

Justin Verlander

300

Green Day

300

What is the name of a coffee drink prepared by diluting espresso with water?


Americano

300


Brad Pitt

George Clooney

Gary Oldman

400

What is the change in enthalpy for the following goal equation? 

H2SO4(l) → SO3(g) + H2O(g)


Using the following information: 

| H2S(g) + 2O2(g) → H2SO4(l) ΔH = -235.5 kJ 

| H2S(g) + 2O2(g) → SO3(g) + H2O(l) ΔH = -207 kJ

| H2O(l) → H2O(g) ΔH = 44 kJ |

What is 72 kJ

400

When the given standard enthalpy formulas are reversed or "flipped," what must you do to the given change in enthalpy (delta H)?

change the sign 

400

How much energy is released when 67.04g of phosphorous is reacted with 10.20g of chlorine? Which is the limiting reactant?

__ P + __ Cl2 --> __ PCl3   H = -574 kJ


What is -27.53 kJ

The Cl2 was the limiting reactant 

400

A sample of ethanol absorbs 23.4kJ of energy. The temperature increases from 5.6 degrees Celsius to 19.8 degrees Celsius. What is the mass of the sample if the specific heat capacity of ethanol is 2.46 J/ (goC)?

What is 669.87 grams

400

What is the final temperature of a samples of nickel (cnickel= 0.54 J/g°C) if 328 J of energy is added to a 16.7g sample at an initial temperature of 24.4°C?

What is 60 degrees Celsius 

400

400

400

When 100 grams of hot water at 80 oC is combined with 100 grams of cool water at 20 oC. What is the final temperature of the combined water?

400

D

B

C

400

B

400

Des Moines

Cedar Rapids

Davenport

Iowa


400

What is the ballpark called where the Houston Astro's play?


Minute Maid Park

400

Alicia Keys

400

What does ‘Carne Asada’ mean in Spanish?


Grilled Beef


400


Julia Roberts

Halle Berry

Angelina Jolie

Charlize Theron 

500

What is the change in enthalpy for the following reaction?

1/2H2(g) + 1/2Cl2(g) → HCl(g)


Given the following standard enthalpies: 

| COCl2(g) + H2O(l) → CH2Cl2(l) + O2(g) ΔH = 47.5 kJ 

| 2HCl(g) + 1/2O2(g) → H2O(l) + Cl2(g) ΔH = 105 kJ

 | CH2Cl2(l) + H2(g) + 3/2O2(g) → COCl2(g) + 2H 2O(l) ΔH = -402.5 kJ|

What is -230 kJ

500

The enthalpy change of a physical or chemical process depends only on the beginning conditions (reactants) and end conditions (products). The enthalpy change is __________ (dependent/independent) of the pathway of the process and the number of intermediate steps in the process

What is independent

500

How much energy would be produced from the reaction of 2.40 moles hydrogen with 3.95 moles chlorine? Which is the limiting reactant? 

__ H2 + __ Cl2 ---> __ HCl   H = -554 kJ


What is -1330 kJ


H2 is the limiting reactant 

500

H2SO4(aq) + 2NaOH(aq) --> Na2SO4 (aq) + 2H2O (l) + 114 kJ (a)What is the enthalpy change for the given reaction? (b)How much energy would be given off if there were 31.2 grams of water produced?

What is (a) -114 kJ (b) -98.8 kJ of heat or 98,800 J 

500

What is the specific heat of an unknown metal if 1.67 kJ of energy are required to raise the temperature of 79.2 g sample of the metal by 63.3°C

What is 0.333 J/g*C

500


500

500

A 9.36 g piece of Pt is heated to 98.6 oC and then dropped onto a block of ice. When the temperature of the metal has dropped to 0 oC, it is found that 0.37 g of ice melted. What is the specific heat capacity of Pt?

500

D

D

B

A

500

500

Portland

Lewis

Bangor

Maine

500

Name 6 Pitchers on the NLCS roster for the Phillies

500

Linkin Park

500

What is Sauerkraut made out of?


Sauerkraut

500


John Krazinski

Kelly Ripa

Bradley Cooper

Nicole Kidman

Jimmy Kimmel