Chapter 6 Thermochemistry

Question 1

Thermochemistry

Answer 1

Thermochemistry is the study of the relationships between chemistry and energy

Question 2

Energy

Answer 2

The capacity to do work

Question 3

Kinetic Energy

Answer 3

Energy due to motion

Question 4

Thermal Energy

Answer 4

Energy associated with temperature. A type of kinetic energy

Question 5

Potential Energy

Answer 5

Energy due to position or composition

Question 6

Chemical Energy

Answer 6

Energy stored in the bonds of chemical compounds. A type of potential energy

Question 7

Internal Energy

Answer 7

The sum of the kinetic and potential energies of all particles that compose a system

Question 8

State Function

Answer 8

A function whose value depends only on the state of the system, and not how the
system arrived there

Question 9

System

Answer 9

The thing that is under investigation

Question 10

Surroundings

Answer 10

Everything with which the system can exchange energy

Question 11

The Law of Conservation of Energy

Answer 11

Energy is neither created nor destroyed. AKA: the first law of
thermodynamics

Question 12

Heat

Answer 12

The flow of energy caused by a temperature difference.

Question 13

Temperature

Answer 13

A measure of thermal energy

Question 14

Work

Answer 14

A force acting over a distance.

Question 15

Enthalpy

Answer 15

The total heat content of a system

Question 16

Heat of reaction

Answer 16

The amount of heat produced or absorbed by a chemical reaction. AKA: enthalpy of
reaction

Question 17

Endothermic Reaction

Answer 17

Reaction that absorbs heat from its surroundings. Endothermic reactions have
a positive ΔHrxn

Question 18

Exothermic Reaction

Answer 18

Reaction that gives off heat to its surroundings. Exothermic reactions have a
negative ΔHrxn

Question 19

Bomb Calorimetry

Answer 19

Technique used to measure the ΔErxn. Carried out at a constant volume

Question 20

Coffee Cup Calorimetry

Answer 20

Technique used to measure the ΔHrxn. Carried out at a constant pressure.

Question 21

Hess’s Law

Answer 21

The enthalpy change of a chemical reaction is the same regardless of whether the reaction
occurs in one step or several steps. Can be used to calculate ΔHrxn

Question 22

Standard State

Answer 22

Reference conditions for solids, liquids, and gasses

Question 23

Standard Enthalpy of Formation

Answer 23

Change in enthalpy when 1 mol of a compound in its standard state
forms from its constituent elements in their standard states. Abbreviated ΔH°f

Question 24

Standard Enthalpy Change for a Reaction

Answer 24

Change in enthalpy for a reaction when all reactants and
products are in their standard states. Abbreviated ΔH°rxn

Question 25

the equation for heat (q)

Answer 25

q=mcΔT

Question 26

calculating ΔHrxn conversion

Answer 26

n mol/1 * kj/n mol x

Question 27

List steps for Bomb Calorimetry

Answer 27

1. qcal= Ccal * ΔT
2. qrxn= -qcal
3. ΔErxn = qrxn/ moles

Question 28

List steps for coffee cup Calorimetry

Answer 28

1. qcal=mcΔT
2. qrxn= -qcal
3. ΔErxn = qrxn/ moles