Chem 141 exam #3

Question 1

Heat=

(thermal energy)

Answer 1

when energy is tranferred between substances with different temperatures

Question 2

Temperature=

(thermal enery)

Answer 2

proportional to the average kinetic energy of molecular translational motion

Question 3

Energy is _____

Answer 3

the ability to do work or transfer heat

Question 4

Work =

Answer 4

Force X Distance

w=f*d

Question 5

Exothermic Reaction

Answer 5

final heat content of a system<< initial heat content

Question 6

Endothermic Reaction

Answer 6

final heat content of a system>>initial heat content

Question 7

Kinetic Energy

Answer 7

energy of motion

1/2 * mass * (velocity)²

Question 8

Potential Energy

Answer 8

Energy of Position

Question 9

Gravitational Potential Energy

Answer 9

energy due to position in a gravitational field

PE= weight * height

Question 10

Internal Energy

Answer 10

energy of a substance inherent to the material, it does not depend on external forces

Question 11

fundamental principle of a calorimetry experiment is _________

Answer 11

sum of the heat transfers is equal to zero

Question 12

Daltons Law of Partial Pressures

Answer 12

the total pressure of a gas mixture is equal to the sum of its partial pressures of each component of the gas

P=P₁+P₂+P₃…..

Question 13

Ideal Gas Law

Answer 13

PV=nRT

p=atm

v=L

n=moles

R=universal gas constant

T=K

Question 14

Molar volume =

Answer 14

L/mol

Independent of identiy of gas

Question 15

molar volume at STP (0 degrees Celsius and 1.0 bar)

Answer 15

22.7 L/mol

Question 16

Molar Volume Equation

Answer 16

MV= (RT/P)

Question 17

1.0 bar=_______atm

Answer 17

1.01325 atm

Question 18

D_{ideal gas}=

Answer 18

MM * (P/RT)

Question 19

in ideal gas equation PV=nRT, n can also be substituted for ____

Answer 19

m/MM

mass/ molar mass

Question 20

when writing major species ______

Answer 20

dont put coefficients

do put states of matter

Question 21

5 characteristics of ideal gas model is

Answer 21

1. particles move in straight lines
2. when particles collide they don’t lose energy
3. particles are widely spaced
4. particles have no volume
5. paticles are not attracted to eachother(sticky)

Question 22

ideal gas model works best with these 2 conditions

Answer 22

1. low pressure
2. high temperature

Question 23

concentrated solution

Answer 23

relatively large amount of a specific solute per unit quantity of solution

Question 24

diluted solution

Answer 24

has a relatively low amount of specific solute per unit quantity of solution

Question 25

saturated solution

Answer 25

solution that has reached the solubility limit for the specified temperature

Question 26

Unsaturated Solution

Answer 26

solution whose concentration is less than the solubility limit for the specified temperature

Question 27

Supersaturated Solution

Answer 27

solution whose concentration is greater than the normal solubility limit for the specified temperature

Question 28

Miscible

Answer 28

soluble ( in reference to liquids)

Question 29

Immiscible

Answer 29

Insoluble (in reference to liquids)

Question 30

You know saturation is reached when_______

Answer 30

the dissolving rate = the crystallization rate