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Gen chem > Exam 2 > Flashcards

Exam 2 Flashcards

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1
Q

Molarity =?

A

Moles/ liters

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2
Q

Energy

A

Capacity to do work

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3
Q

Heat (q)

A

Energy transferred from different temperatures.

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4
Q

Work (w)

A

Work = force * distance (a force applied over a distance)

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5
Q

Internal energy (E)

A

Sum of all kinetic energy and potential energy (energy in particles)

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6
Q

Electrostatic potential energy equation

A

Eel = (kQ1*Q2)/distance

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7
Q

Positive vs negative electrostatic potential energy

A

Positive = atoms want to leave negative = atoms like eachother and are close

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8
Q

Joules to calories

A

1 cal = 4.184 joules

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9
Q

Joule equations

A

1 J = (kg*m^2)/ sec^2

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10
Q

First law of thermodynamics

A

Energy cannot be created nor destroyed

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11
Q

System vs surroundings

A

The solute we use vs the water (everything else that isn’t the chemical equation)

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12
Q

Open system

A

Can exchange heat and mass with surrounding (pot)

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13
Q

Closed system

A

Heat can leave, chemicals cannot

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14
Q

Isolated system

A

Neither heat nor mass can leave

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15
Q

Delta E what does + and - mean for the system

A

+ taking energy from surroundings
- giving energy to surroundings

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16
Q

Exothermic

A
  • energy based on the system
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17
Q

Endothermic

A

+ based on the system

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18
Q

Solubility of NO3

A

Always soluble

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19
Q

Solubility of CH3COO

A

Always soluble

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20
Q

Enthalpy

A

H= P times V times heat (q)

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21
Q

What is the goal of heat of formation

A

form ONE mole of the product (can have 1/2s)

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22
Q

elemental molecules heat of formation

A

0

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23
Q

Making a bond enthalpy value

A

generally negative
negative = relaxed
positive = charged

24
Q

delta H of the rxn =

A

Bonds broken - bonds produced

25
Q

wavelength

A

difference between two peaks (horz)

26
Q

Frequency

A

how frequently a wave sequence occurs (like a full sine wave)

27
Q

c in wavelength calc?

A

c= 3 x 10^8 m/s

28
Q

wavelength formula

A

v = c/ h (weird h)

29
Q

weird h in wavelength calc?

A

wavelength

30
Q

v in wavelength calc?

A

hz or hertz

31
Q

Nano-

A

10^-9

32
Q

seven flavors of light in order from smallest wavelength to largest

A

Violet to red (ROYGBIV backwards)

33
Q

blackbody radiation

A

if it gets hot enough, light comes off and vice versa to 0

34
Q

Plancks constant

A

6.626x10^-34 j times s

35
Q

quantized

A

countable

36
Q

photoelectric effect

A

shining light on a surface of metal will eject electrons

37
Q

work function

A

amount of energy required to eject an electron

38
Q

amplitude/intensity

A

height of the wave or more of the same sized packets of light

39
Q

Energy of photon =?

A

planck’s constant times wavelength

40
Q

Bohr model

A

electron is a particle, and can only occupy certain spaces called allowed orbits

41
Q

With light, every element has a unique amount of ____

A

bands

42
Q

photon aborbed:
Photon released:

A

up in energy level
down in energy level

43
Q

Rydberg constant

A

E =(-hcRH) (1/n^2) = (-2.18 x 10^-18 J) (1/n^2)

44
Q

excitation with electrons

A

electrons go up

45
Q

Relaxation with electrons

A

electrons go down

45
Q

1 J =?

A

1kg (m^2S^2)

45
Q

electron orbits are considered

A

standing waves

46
Q

de Broglie wavelength equation

A

wavelength = h/mv mass has to be in kg

46
Q

Heisenberg’s uncertainty principle

A

yeahhhhh we kinda dont know where the electron is, just where it is probable to be.

47
Q

Heisenberg’s uncertainty equation

A

(delta X)(delta mv) is greater than or equal to h/4pi
delta X = change in position

48
Q

bohrs model vs schrodinger model

A

bohrs we know where the electron is, schrodingers we dont

49
Q

principal quantum number

A

n, the shell

50
Q

angular momentum number

A

L, the shape of the shell
s= 0 p=1 d=2 f=3 basically 0 -> n-1

51
Q

Magnetic quantum number

A

ML (L is subscript) differentiates the orbit the electron is in

52
Q
A

Gen chem (6 decks)

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