Thermodynamics Review Part 1

Thermodynamics Review Part 1

Multiple Choice

In this equation, is more energy stored in the bonds of the reactants or products: NaCl + AgF +100KJ -----> NaF + AgCl

• Products

• Reactants

Multiple Choice

What kind of equation is this: 2KI + MgCl₂ + 200KJ ----> 2KCl + MgI₂

• Endothermic

• Exothermic

Multiple Choice

What type of reaction is this?

• Exothermic

• Endothermic

• Energy Producing

• No way to tell

Multiple Choice

ΔH value in an endothermic reaction is a positive number.

• True
• False

Multiple Choice

Your family uses candles to see when the electricity goes out.

• exothermic

• endothermic

Multiple Choice

gas --> liquid --> solid is what type of reaction?

• endothermic

• exothermic

• catalytic

• inhibited

Multiple Choice

Solid --> liquid --> gas is what type of reaction?

• endothermic

• exothermic

• catalytic

• inhibited

Multiple Choice

_____ reactions usually feel hot!

• endothermic

• exothermic

Multiple Choice

In an endothermic reaction, energy is _________.

• absorbed

• released

Multiple Choice

What is an example of endothermic process?

• Chemical Ice Pack

• Boiling Water

• Bonfire

Review

Energy can be transferred from one form to another

• What starts as electrical energy can be converted heat, light,sounds

• Refer to the law of conservation of Energy

Multiple Select

A gasoline-powered generator is used to provide lighting for a house.

Choose the best 3 energy forms found in this transformation example?

• Chemical

• Mechanical

• Light

• Nuclear

Multiple Select

When wood burn it changes from chemical energy to what 2 other forms of energy? Click the 2 other forms.

• Radiant (Light)

• Nuclear

• Heat

• Mechanical

Multiple Choice

See the picture. There is electrical energy coming from the outlet in the wall. When the energy goes into the lamp what energy does it transform into?

• Mechanical Energy

• Thermal Energy

• Sound Energy

• Light Energy

Multiple Choice

According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 

• destroyed, destroyed
• created, saved
• created, destroyed
• lost, found

Heating Curve

Temp increasing = State of matter

Temp constant = phase change

Multiple Choice

Between which points is the temperature of the substance increasing?

• A-B only. 
• A-B, C-D, E-F
• B-C only. 
• B-C, D-E

Multiple Choice

What state(s) of matter are present at D-E?

• Solid-liquid
• Liquid
• Liquid-gas
• Gas-Solid

Multiple Choice

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

Calculating the Energy Change

q=mc $\Delta$ T

Multiple Choice

A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g of water at 20.0°C. The final temperature of the system is 30.2°C. What is the specific heat capacity of the metal (assuming the specific heat of water is 4.184 J/g^oC)?

• 2.56 J/g°C

• 0.391 J/g°C

• 5.29 J/g°C

• 3.50 J/g°C

Multiple Choice

A sample of an unidentified metal absorbs 50.0 J of heat energy and that raises the temperature of the metal by 25.0°C. If the metal has a specific heat of 0.10 J/g°C, what is the mass of the metal sample?

• 25 g

• 30. g

• 20. g

• 50. g

Multiple Choice

Identify the given ΔT in problem:

• 15.75 g

• 1086.75 J

• 150°C

• unknown (aka ?)

Multiple Choice

Water molecules have the greatest kinetic energy in
________________

• Ice at 0 °C.
• Water at 373 K.
• Water at 98 °C
• Steam at 150 °C.

Multiple Choice

How many Joules of energy are required to change 10 gram of water from 20 ^οC to 90 ^οC?

• 1400 J
• 2800 J
• 210,000 J
• 1,400,000 J

Multiple Choice

What is the specific heat capacity of water in Jmol^-1K^-1?

• 8.31

• 8.314

• 4.183

• 4.18