AP Chemistry: Thermochemistry flashcards

Question 1

What device measures the energy change of processes held at constant volume?

Accepted Answer

A bomb calorimeter

Question 2

What do you call a device used to measure the heat absorbed or released in a chemical or physical process?

Accepted Answer

A calorimeter

Question 3

What is the process of measuring the heat involved in a chemical or physical process called?

Accepted Answer

Calorimetry

Question 4

Which area of science deals with the relationships between heat, work, and all forms of energy in chemical and physical processes?

Accepted Answer

Chemical thermodynamics

Question 5

What kind of process is a chemical reaction or physical change that absorbs heat?

Accepted Answer

An endothermic process

Question 6

What kind of process is a chemical reaction or physical change that releases heat?

Accepted Answer

An exothermic process

Question 7

What is the capacity to supply heat or do work called?

Accepted Answer

Energy

Question 8

Which quantity is the sum of a system's internal energy and the product of its pressure and volume?

Accepted Answer

Enthalpy (H)

Question 9

What is the heat released or absorbed by a system at constant pressure during a process called?

Accepted Answer

Enthalpy change (ΔH)

Question 10

What is the work done as a system expands or contracts against external pressure called?

Accepted Answer

Expansion work (pressure-volume work)

Question 11

Which law says a system's internal energy changes through heat flowing in or out or through work done on or by the system?

Accepted Answer

The first law of thermodynamics

Question 12

What is the transfer of thermal energy between two bodies called?

Accepted Answer

Heat (q)

Question 13

Which extensive property is the quantity of heat needed to raise a body's temperature by 1 degree Celsius (or 1 kelvin)?

Accepted Answer

Heat capacity (C)

Question 14

Which intensive property is the heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius (or 1 kelvin)?

Accepted Answer

Specific heat capacity (c)

Question 15

Which law says that if a process can be written as the sum of several steps, its enthalpy change equals the sum of the steps' enthalpy changes?

Accepted Answer

Hess's law

Question 16

What do you call a compound made only of hydrogen and carbon?

Accepted Answer

A hydrocarbon

Question 17

What is the total of all kinds of energy present in a substance or substances called?

Accepted Answer

Internal energy (U)

Question 18

What is the SI unit of energy?

Accepted Answer

The joule (J)

Question 19

What is the energy associated with an object's motion called?

Accepted Answer

Kinetic energy

Question 20

Which unit, used for the energy that food provides, equals 1000 cal (1 kcal)?

Accepted Answer

The nutritional Calorie (Calorie, with a capital C)

Question 21

What is the energy of a particle or system derived from its relative position, composition, or condition called?

Accepted Answer

Potential energy

Question 22

What is the heat released when one mole of a compound undergoes complete combustion under standard conditions called?

Accepted Answer

Standard enthalpy of combustion (ΔH°c)

Question 23

What is the enthalpy change when 1 mole of a pure substance forms from its elements in their most stable states under standard conditions called?

Accepted Answer

Standard enthalpy of formation (ΔH°f)

Question 24

What is the accepted set of common reference conditions for reporting thermodynamic properties called?

Accepted Answer

The standard state

Question 25

What kind of property depends only on the state of a system and not on the path taken to reach it?

Accepted Answer

A state function

Question 26

In thermodynamics, what is all the matter other than the system being studied called?

Accepted Answer

The surroundings

Question 27

In thermodynamics, what is the portion of matter undergoing the change being studied called?

Accepted Answer

The system

Question 28

Which intensive property is a quantitative measure of hotness and coldness?

Accepted Answer

Temperature

Question 29

How many joules does 1 calorie (cal) equal by definition?

Accepted Answer

4.184 J

AP Chemistry: Thermochemistry flashcards

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