Chapter 6- Thermochemistry

Question 1

Law of Conservation of Energy

Answer 1

energy can be transformed from one form to another, but it cannot be created or destroyed

Question 2

Potential energy

Answer 2

energy due to position or composition

Question 3

Kinetic energy (KE)

Answer 3

energy due to the motion of an object, depends on mass and velocity

Question 4

KE Formula

Answer 4

KE=½mv^2

Question 5

Temperature

Answer 5

property that reflects random motion of particles in a particular substance

Question 6

Heat (q)

Answer 6

involves the transfer of energy between 2 objects due to difference in temperature

Question 7

Work (w)

Answer 7

force acting over a distance

Question 8

State Function

Answer 8

property of a system that depends only on its present state, and is independent of the particular pathway

Question 9

Exothermic

Answer 9

chemical reaction that results in an evolution of heat, energy is flowing out of the system

Question 10

Endothermic

Answer 10

chemical reaction that absorbs energy, and flows into the system

Question 10

Endothermic

Answer 10

chemical reaction that absorbs energy, and flows into the system

Question 11

Enthalpy (H)

Answer 11

property of a system that measures the system’s ability to allow heat or energy to flow through

Question 12

Formula of enthalpy change

Answer 12

H=E+PV

Question 13

+H, +q, +w, compressed gas, -volume

Answer 13

Reaction is endothermic

Question 14

-H, -q, -w, expanding gas, +volume

Answer 14

Reaction is exothermic

Question 15

Calorimetry

Answer 15

measuring heat and is based on observing temperature change

Question 16

Heat Capacity (C) formula

Answer 16

heat absorbed /increase in temperature

Question 17

Specific heat capacity (s)

Answer 17

energy required to heat 1g of a substance

Question 18

Heat formula

Answer 18

q=smT

Question 19

1st law of thermodynamics

Answer 19

energy of the universe is constant

Question 20

Internal energy

Answer 20

the sum of the kinetic and potential energy of all particles in the system

Question 21

Internal energy formula

Answer 21

E=q+w

Question 22

Formula for work

Answer 22

w=-PV

Question 23

1 L*atm=

Answer 23

101.325 J

Question 24

Energy

Answer 24

to do work or produce heat

Question 25

Hess’s law

Answer 25

enthalpy change is the same regardless if the reaction took many steps or one step

Question 26

Standard enthalpy of formation

Answer 26

enthalpy change that accompanies the formation of one mole of a compound from its elements, with all substances in their standard states

Question 27

Standard enthalpy of formation formula

Answer 27

nH(products)-nH(reactants)

Question 28

CH4

Answer 28

Methane

Question 29

C2H6

Answer 29

Ethane

Question 30

C2H6

Answer 30

Propane

Question 31

C4H10

Answer 31

Butane

Question 32

C5H12

Answer 32

Pentane

Question 33

C6H14

Answer 33

Hexane

Question 34

C7H16

Answer 34

Heptane

Question 35

C8H18

Answer 35

Octane