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chem 103 > lab exam > Flashcards

lab exam Flashcards

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1
Q

when do we get emission spectra

A

when electrons drop from a higher energy level to a lower energy level and emit a photon

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2
Q

when do we get absorption spectra

A

when light passes through an atom and gets absorbed at certain wavelengths

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3
Q

when are electrons emitted due to the photoelectric affect

A

when the frequency of incident light is greater than the threshold frequency

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4
Q

when are electrons emitted due to the photoelectric affect

A

when the frequency of incident light is greater than the threshold frequency

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5
Q

what is the energy of the photons related to?

A

the frequency, the greater the frequency the higher the energy of the photons

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6
Q

what is the intensity of incident light related to

A

it is directly related to the number of photons emitted

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7
Q

what is the chemical formula for ascorbic acid (Vitamin C)

A

C6H8O6

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8
Q

what is the heat capacity of an object

A

the amount of heat needed to change it’s temperature by 1 degree

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9
Q

what can a system contain? what can it not?

A

it can contain internal energy, it cannot contain heat or work

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10
Q

what is heat

A

energy in transition

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11
Q

what spectra series corresponds to transitions from n(initial) to a n(final) of 1

A

the lyman series

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12
Q

what spectra series corresponds to transitions from higher levels to n(final) = 2

A

balmer series

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13
Q

what spectra series corresponds to transitions from higher energy levels to n(final) = 3

A

paschen series

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14
Q

in which directions (across, up and down) does atomic radii increase

A

right to left, and top to bottom

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15
Q

in which directions (across, up and down) does metallic character increase

A

right to left and down a column

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16
Q

what happens during ionic bonding

A

a transfer of electrons

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17
Q

what happens during covalent bonding

A

electrons are shared equally

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18
Q

what is electronegativity

A

the measure of an atom’s ability to attract the bonding electron density to itself

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19
Q

in which directions (across, up and down) does electronegativity increase

A

left to right and bottom to top

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20
Q

when is a compound mostly ionic

A

when the electronegativity difference is greater approximately 2

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21
Q

what is the measure of an atoms ability to attract the bonding density towards itself called

A

electronegativity

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22
Q

which type of IMF is the strongest

A

ion-dipole

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23
Q

order the IMFs from weakest to strongest

A

london dispersion < dipole dipole < h bonding < ion-dipole

24
Q

which is has good conductivity in water- an ionic or covalent substance? why?

A

ionic - ionic compounds can dissociate into ions

25
Q

what are ionic oxides

A

basic anhydrides

26
Q

what are covalent oxides

A

acidic anhydrides

27
Q

what are the two factors that affect the position of equilibrium

A

1) the ability of R to draw electrons from O-H
2) the stability of the anion (the further right the stronger the acid

28
Q

t/f like dissolves like

A

t

29
Q

what is molar heat capacity

A

the amount of heat required to raise the temp of 1 mol of a substance per unit of mol

30
Q

is pressure constant in a calorimeter

A

yes

31
Q

why do we find the extrapolated temp from the graph of a calorimeter experiment

A

because calorimeters are not 100% efficient

32
Q

how do you draw the line on a calorimeter graph

A

draw from the end point to the max, then extend to the y axis

33
Q

is heat capacity (C) intensive or extensive? why?

A

intensive- since the substance does not matter

34
Q

is specific heat capacity intensive or extensive? why?

A

extensive- the amount of substance is needed to calculate c

35
Q

is molar heat capacity intensive or extensive? why?

A

extensive- the amount of substance is needed to calculate Cm

36
Q

what happens when excited atoms return to a lower state

A

a photon is emitted

37
Q

what are applications of emission line spectra

A

flame test to identify elements, fireworks, florescent lights

38
Q

in what order does wavelength of the visible spectrum increase

A

violet<blue<green<yellow<orange<red

39
Q

what is the equation for the transition between energy levels

A

delta E = Efinal - Einitial = -Z^(2)Rh( (1/nf^2) + (1/ni^2))

40
Q

what is a spectrometer used for

A

obtain the values of absorption (A) as the wavelength of the incident light is varied.

41
Q

what does a larger A value obtained from a spectrometer mean

A

more of the incident light is absorbed

42
Q

what does a longer wavelength of emitted photon correspond to

A

a lower energy

43
Q

which emitted photon has the shortest wavelength

A

n = inf, it has the largest change in energy

44
Q

what is the most abundant metal

A

Al

45
Q

what is the main ore of Al

A

bauxite

46
Q

how is Al extracted

A

via the hall heroult process

47
Q

what is the ratio of reactants called

A

stoichiometric factor

48
Q

what is the stoichiometric point

A

the equivalence point

49
Q

where is equivalence point of a titration

A

when chemically equivalent quantities of reactants have been reached

50
Q

where is the endpoint of a titration

A

when the colour change has been observed

51
Q
A
52
Q

what colour does lithium chloride burn

A

red

53
Q

what colour does barium chloride burn

A

green

54
Q

when one KIO3 particle reacts with ascorbic acid how many ascorbic acid molecules react

A

3

55
Q

what is the formula for ascorbic acid

A

C6H8O6

56
Q

what is ascorbic acid

A

vitamin c

57
Q

in what ratio does vitamin c react with NaOH

A

1:1

chem 103 (3 decks)

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