5.1 Thermochemistry

Question 1

Fission

Answer 1

The splitting of a
unstable, large atomic mass nuclei
into two or more smaller, stabler
nuclei
➢ Accomplished by firing a
neutron at the nuclei
➢ We also access this via nuclear
energy production

Question 2

Fusion

Answer 2

the combination
of two or more low mass atomic
nuclei under the influence of
immense pressure and temperature

Question 3

open system

Answer 3

matter and energy can move in or out

Question 4

closed system

Answer 4

matter cant move but energy can

Question 5

isolated system

Answer 5

matter and energy are not free to move

Question 6

temperature

Answer 6

average kinetic energy

Question 7

heat

Answer 7

thermal energy transferred between two systems

Question 8

thermal energy

Answer 8

total kinetic and potential energy

Question 9

potential energy

Answer 9

stored energy

Question 9

kinetic energy

Answer 9

energy associated with movement

Question 9

energy

Answer 9

ability to do work

Question 10

work

Answer 10

energy transfer when a force moves an object a distance

Question 11

specific heat capacity

Answer 11

quantity of thermal energy required to heat 1 g of a substance up 1 degree

Question 12

q

Answer 12

heat transferred in joules, mcchangeint

Question 13

enthalpy change

Answer 13

the energy released to or absorbed by the
surroundings during a physical or chemical change at constant pressure

Question 14

bond dissosociation energy

Answer 14

how much energy the bond has to absorb to
then break

Question 15

weird groups

Answer 15

P4, Se8, S8

Question 16

gases

Answer 16

all noble gases, hydrogen, oxygen, nitrogen,
fluorine and chlorine

Question 17

liquids

Answer 17

mercury and bromine

Question 18

solids

Answer 18

everything but mercury and bromine noble gases, hydrogen, oxygen, nitrogen,
fluorine and chlorine

Question 19

molar enthalpy of solution

Answer 19

Hsol

Question 20

molar enthalpy of combustion

Answer 20

Hcomb

Question 21

molar enthalpy of vaporization

Answer 21

Hvap

Question 22

molar enthalpy of freezing

Answer 22

Hfr

Question 23

molar enthalpy of formation

Answer 23

Hf

Question 24

molar enthalpy of neutrilization

Answer 24

Hneut, can be based on acid or base

Question 25

standard enthalpy of formation

Answer 25

enthalpy change during the formation of 1 mol of a compound with all substances in their standard form at SATP

Question 26

SATP

Answer 26

Standard Ambient Temperature and Pressure
25oC and 100 kPa

Question 27

Hess’s Law

Answer 27

states that the enthalpy change for the conversion of
reactants to products is the same whether the conversion occurs in
one step or several steps

Question 28

Application of Hess’s Law

Answer 28

study energy changes that are difficult to measure using calorimetry or through experimental means

Question 29

chemical bonds within a substance …

Answer 29

represent potential energy

Question 30

Calorimetry

Answer 30

the process of measuring the amount of heat released or absorbed during a chemical reaction.