THERMODYNAMICS REVIEW

RANDOM

100

What gives us the ability to do work or cause change?

What is energy

200

The Law of Conservation of Energy tells us that Energy is not _________________ . It can only be _________ from one kind of energy to another.

created nor destroyed. transformeed

300

The enthalpy change of a reaction can be calculated using the following equation:

ΔH = (sum of enthalpies of reactants) - (sum of enthalpies of products)

400

 At the melting point of a substance, temperature ________ as heat is being added and the substance is changing from a solid to a liquid.

Remains constant

500

Draw the molecule:

CH₃COOC₂H₅

Mr. Gonzalez will determine the winner. 

RANDOM 2

100

Mechanical Energy is the ______ or total of the potential and kinetic energy in an object.

Sum

200

What is calorimetry? What is the device used to measure this?

The science of measuring heat transfer when a substance absorbs or gives off heat; calorimeter. 

300

As something gets lifted higher off the ground, its _______  _______ increases

Potential Energy

400

Given that the enthalpy of fusion for water is 334 J/g. Find the mass of water that has been converted to ice if the heat released was equal to 7800 J.

24 g

500

Calculate the enthalpy in the reaction below:

C₂H₂ (g) + 2H₂ (g) --> C₂H₆(g)

H-H (432 kJ/mol)

C(triple)C (839 kJ/mol)

C-H (413 kJ/mol)

C-C (347 kJ/mol)

-296 kJ/mol; exothermic

RANDOM 3

100

Food, paper, wood, batteries - these are examples of objects that have stored potential energy in them. What kind of energy?

What is chemical energy

200

What kind of energy transformation takes place in a campfire?

Chemical energy is transformed into heat and light energy

300

The type of energy that travels in waves. What is it?

Electromagnetic

400

Iron is the heaviest metal vaporized in the sun. Its (delta)H_vap is 6071.43 J/g. How much heat is needed to turn (keep) .5 kilogram of iron into a gas?

3 x 10⁶ J

500

A 4.50 g coin of copper absorbed 54 calories of heat. What was the final temperature of the copper if the initial temperature was 25°C? The specific heat of copper is 0.092 cal/g°C.

160°C

RANDOM 4

100

Harry uses a pulley to put up a bucket of water from a well. What energy transformation takes place as the bucket is lifted up out of the well?

As the bucket rises, kinetic energy is transformed to potential energy

200

Whenever there is friction between the air and an object, the ground an an object, or two objects what kind of energy is produced?

Thermal/Heat

300

Thermal energy is also what type of energy?

What is heat energy

400

A 75-kg refrigerator is located on the 70th floor of a skyscraper (300 meters above the ground) What is the potential energy of the refrigerator?

2 x 10⁵ J

500

How much energy is required for the reaction to occur?

(Mr. G will show you the diagram)

200 kJ

RANDOM 5

100

What energy transformations take place when you use a flash light?

chemical (in the batteries) --> electrical (in the wires) --> light (in the bulb)--> heat (comes from the bulb)

200

At what point does a roller coaster have the most kinetic energy?

At the bottom of the biggest hill

300

Where would a skateboarder be in the pipe when they have the greatest Potential energy?

At the top on either side.

400

What is the final temperature when 640. calories are given off by 40.0 g of water at 45.0 °C ?

29.0 °C

500

Calculate the bond enthalpy for the reaction:

CH₃CH₂CH₃ (g) + 5O₂ (g) --> 3 CO₂ (g) + 4 H₂O (g)

Exo or Endo?

-2057 kJ/mol

Exothermic