Ch 9

Question 1

Energy

Answer 1

capacity to do work or produce hear

Question 2

how is energy transfered

Answer 2

by work (force*displacement)

Question 3

two main forms of energy

Answer 3

potential and kinetic

Question 4

kinetic energy

Answer 4

energy due to motion

Question 5

potential energy

Answer 5

energy due to position or composition

Question 6

what is a system in a chemical equation

Answer 6

the molecules

Question 7

first law of thermodynamics

Answer 7

total energy in universe is constanr

Question 8

internal energy

Answer 8

sum of kinetic and potential energy in system

Question 9

what is state function

Answer 9

property independent or pathway

Question 10

state functions examples

Answer 10

temerature, pressure, concentrations, phase of matter, and internal energy

Question 11

how do you find Change in energy of system

Answer 11

it is the negative change in surrounding energy

Question 12

symbol for heat

Answer 12

q

Question 13

symbol for work

Answer 13

w

Question 14

how to find change in system energy

Answer 14

heat+ work

Question 15

what does the sign of a mean

Answer 15

when positive it means system is endothermic, if it is negative it means system is exothermic

Question 16

exothermic

Answer 16

energy released, hot to touch

Question 17

endothermic

Answer 17

heat absorbed, cold to touch

Question 18

what does sign of w mean

Answer 18

negative means work is done by system, when positive it means work is done to it

Question 19

i what unit is measurement for thermal energy

Answer 19

temp

Question 20

how to find q equations

Answer 20

mass x heat capacity x change in temp

Question 21

specific heat capacity

Answer 21

amount of energy required to increase temp of 1g of substance

Question 22

expansion

Answer 22

work done by a gas +

Question 23

compression

Answer 23

work done to a gas -

Question 24

what does it mean if change in vol is 0

Answer 24

w is 0

Question 25

calorimetry

Answer 25

measure or heat transfer

Question 26

t or f using a calorimeter causes equations to change

Answer 26

false

Question 27

enthalpy

Answer 27

the amount of heat transferred under constant pressure

Question 28

enthalpy symbol

Answer 28

H

Question 29

equations for enthalpy

Answer 29

H = E+PV

Question 30

what is change in enthalpy equal to

Answer 30

heat of products

Question 31

Work equation

Answer 31

w = p x change in volune

Question 32

when manipulating a reaction with delta H what happens to delta H

Answer 32

same thing that happens to equation

Question 33

Hess’s law

Answer 33

if steps describe a reaction the sum of their delta h is equivalent

Question 34

how does a change in potential happen in chem reactions

Answer 34

when bonds are broken

Question 35

does breaking a bond require energy or does making one require it

Answer 35

breaking a bond requires energy

Question 36

how to find delta h for chem reaction

Answer 36

summing up bonds broken plus bonds created

Question 37

standard state for gas

Answer 37

pure substance 1 atm pressure

Question 38

standard state for liquid or solid

Answer 38

1 atm and 25 deg celcius

Question 39

standard state for aq

Answer 39

1 M concentration

Question 40

what does a bomb calorimeter ensure

Answer 40

reactions occur at constant volume

Question 41

what bonds are broken and formed in ending thermos reaction

Answer 41

weak are broken and strong form

Question 42

what bonds are broken and formed in exothermic reaction

Answer 42

strong broken and weak formed

Question 43

what is standard enthalpy of formation

Answer 43

energy for when a mop of compound forms from constituent elements in standard states

Question 44

how to calc change in enthalpy of reaction

Answer 44

sum of prod bonds - sum of react bonds multiply all by their coefficients

Question 45

born havre cycle

Answer 45

a series of steps based on hess law that represent formation of ionic compounds and constituent elements

Question 46

how to find lattice energy

Answer 46

sum of energies after using born janet cycle