Show:
Phase Change Diagrams
Potential Energy Diagrams
Thermochemistry
Specific Heat Calculations
Heat Stoichiometry
100

What is the phase change that occurs when a liquid becomes a solid?

Freezing

100

Is the potential energy diagram endothermic or exothermic?

Exothermic

100

What type of reaction absorbs heat from surroundings? Must write the whole word.

Endothermic

100

How much heat is absorbed by 50g water when it changes from 20°C → 30°C?

2,090 J

100

Based on the following equation, how much heat is released when 2.00 moles of CH4 are burned? 

CH4 + 2O2 → CO2 + 2H2O            ∆H= -890 kJ    

-1780 kJ

200

Name two phase changes that are exothermic?

TWO:

Condensation, Freezing, Deposition

200

What do we call the difference in potential energy between reactants and products?

ΔH

Change in Enthalpy

Q

Heat of the Reaction

200

What base unit is used to measure energy?

Joule (J)

200

If 100g of a liquid absorbs 2000 J and rises 10°C, what is the liquid's specific heat?

2 J/g°C

200

Based on the reaction, how much heat is released when 36.0 g of water is formed?  

2H2 + O2 → 2H2O               ∆H= -572 kJ

−572 kJ

300

What is happening to kinetic energy during phases A, C, & E?

Increasing

300

What is the peak of the curve on the potential energy diagram called?

Activated Complex

300

What characteristic causes a metal spoon feel hotter than a wooden spoon?

Specific Heat

300

How much energy is needed to melt 150. g of ice?

50,100 J

300

Based on the reaction, how much heat is released when 34.0 g of NH₃ is produced?

N2 + 3H2 → 2NH3              ΔH= −92.0 kJ

−91.8 kJ

400

Which line segment represents BOTH liquid and gas?

D

400

From the potential energy diagram, calculate the activation energy for the forward reaction.

60 kJ

400

How do you find ΔT?

Final Temp - Initial Temp

400

How many Joules are given off when 145 g of steam condenses to liquid water?

−328,000 J

400

Based on the reaction, how much heat is released when 44.0 g of CO₂ is formed?

2CO + O2 → 2CO2              ΔH= −566 kJ

−283 kJ

500

What is the boiling point according to the heating curve diagram?

150°C

500

Using the potential energy diagram, what is ΔH of the reverse reaction? Must include either a positive sign or a negative sign.

+20 kJ

500

What do you call the phase change that goes directly from solid to gas?

Sublimation

500

A 50.0 g piece of metal absorbs 2100 J of heat and its temperature increases from 20.0°C to 30.0°C. What is the specific heat of the metal?

4.2 J/g°C

500

Based on the equation, how much heat is released when 60.0 g of CO₂ is produced?

2C2H6 + 7O2 → 4CO2 + 6H2O      ΔH= −3120 kJ

−1060 kJ