Chapter 13 Vocab Review - Thermochemistry

Thermochemistry Chapter 13 Vocab Review

Multiple Choice

Why are lines B and D flat?

• The ice is melting

• The ice is freezing

• All of the thermal energy is used to break the bonds

• They stopped the stopwatch

• They stopped heating the ice.

Multiple Choice

The diagram shows a heating curve for ice. Which line represents the ice melting?

• A

• B

• C

• D

• E

Multiple Select

Select the state changes that latent heat of vaporization applies to.

• melting

• evaporating

• freezing

• condensing

• sublimation

Multiple Select

Select the state changes that latent heat of fusion applies to.

• melting

• evaporating

• freezing

• condensing

• sublimation

Multiple Choice

Which of the letters (A-D) represents the potential energy of the products?

• A
• B
• C
• D

Multiple Choice

Which of the letters (A-D) represents the potential energy of the reactants?

• A
• B
• C
• D

Multiple Choice

True or false: melting and freezing occur at the same temperature!

• True

• False

• I don't know

Multiple Choice

Between which points is the substance changing state?

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

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

Between which points is the temperature of the substance remaining constant?

• 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

In which segment is the kinetic energy remaining constant?

• A-B
• B-C
• C-D
• E-F

Multiple Choice

Which segment represents the heat of fusion?

• A-B
• B-C
• C-D
• D-E

Multiple Choice

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

Multiple Choice

For an exothermic reaction, the heat is on the ____ side

• reactant

• product

• either side

Multiple Choice

For an endothermic reaction, the heat is on the ____ side.

• reactant
• product
• either side

Multiple Choice

When you dropped a hot metal sample into room temperature water in the lab what happened?

• the heat from the metal traveled into the water
• the cool from the water traveled into the hot metal
• both of the other answers are correct

Multiple Choice

Durning a phase change the temperature of a substance_________.

• always increases

• always decreases

• always stays the same

• varies

Multiple Choice

What does temperature measure?

• heat

• average kinetic energy

• space

• time

Multiple Choice

Convert 42 kJ into joules

• 0.042 J

• 175.73 J

• 42000 J

• 10.04 J

Multiple Choice

What is the study of heat changes that accompany chemical reactions and phase changes?

• energy

• chemistry

• work

• thermochemistry

Multiple Choice

A cast iron skillet is used to fry bacon. For optimal frying, the pan must be heated to about 178 ^oC from a room temperature of 22.0 ^oC. It is known that 1.58 x 10⁵ J of heat energy are absorbed by the pan to reach the desired temperature and the specific heat of iron is 0.450 J/g ^oC. What must the mass of the skillet be?

• 12.7 kg

• 2.25 kg

• 110 kg

• 1.97 kg

Multiple Choice

The graph represents the uniform heating of a substance, starting with the substance as a solid below its melting point. Which line segment listed below represents an increase in potential energy and no change in average kinetic energy?

• Line segment AB

• Line segment BC

• Line segment CD

• Line segment EF

Multiple Choice

The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?

• #1 represents the enthalpy change for this exothermic reaction.

• #2 represents the enthalpy change for this endothermic reaction.

• #3 represents the enthalpy change for this endothermic reaction.

• #4 represents the enthalpy change for this exothermic reaction.

Multiple Choice

What kind of graph is this?

• endothermic
• exothermic

Multiple Choice

H₂ + 2 C + N₂ + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?

• Endothermic 
• Exothermic

Multiple Choice

The temperature of a glass of cold water will eventually...

• Match the temperature of the surrounding environment.
• Always be colder than the surrounding environment.
• Become warmer than the surrounding environment.
• Never change temperature.

Multiple Choice

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 100 Joules of heat(Q) is added to 20 grams?

• 12.82 °C
• 24.12°C
• 351 °C

Multiple Choice

Energy cannot be created or destroyed; it can only be transferred refers to the....

• law of conservation of energy
• law of conservation of mass
• life facts
• law of conservation of chemistry

Multiple Choice

Heat is measured in 

• joules
• grams
• degrees celcius

Multiple Choice

A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.

• endothermic; positive

• endothermic; negative

• exothermic; negative

• exothermic; positive

Multiple Choice

Heat transfer by conduction occurs when...

• particles bump into each other
• large numbers of atoms move from place to place
• atoms give off heat in the form of electromagnetic waves
• electromagnetic waves travel from place to place through a vacuum

Multiple Choice

The transfer of thermal energy between objects of different temperatures is called...

• temperature

• heat

• internal energy

• none of these

Multiple Choice

Heat flows from _______ to ______ objects

• cooler to warmer
• warmer to warmer
• warmer to cooler
• cooler to cooler

Multiple Choice

H₂ + Cl₂ --> 2 HCl + 1845 kJ

Is this reaction endothermic or exothermic?

• Endothermic

• Exothermic

Multiple Choice

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.

• Warm

• Cold

• Bubbly

• Damp

Multiple Choice

Do the reactants in an exothermic reaction have a higher or lower energy than the products?

• Higher
• Lower

Multiple Choice

Do reactants in an endothermic reaction have a higher or lower energy than the products? 

• Higher
• Lower

Multiple Choice

Is the combustion of gasoline endothermic or exothermic?

• Endothermic

• Exothermic

Multiple Choice

In an endothermic reaction the system is releasing energy.

• True
• False

Multiple Choice

In an exothermic process the surrounding looses heat.

• True

• False