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Chem lab finals (tricky only, no math)

front 1

What is the law of conservation of mass?

back 1

Matter cannot be created nor destroyed, only transformed.

front 2

Why are the group 1 metals called "alkali metals"?

back 2

When reacting with water they form alkaline hydroxides

front 3

What is the electron configuration of H+? Of H-?

back 3

H+: 1s0

H-: 1s2

front 4

Define A, a, b and c in the equation A=abc.

back 4

A-absorbance

a- absorptivity constant

b- cell width

c- concentration (of absorbing species)

front 5

Of sodium, potassium, calcium, magnesium and zinc, which would you expect to react the least/littlest?

back 5

Zinc

front 6

What is the purpose of phenolphthalein?

back 6

To detect the presence of a base/low pH.

front 7

Define titration

back 7

To find the exact volume of one reagent required to exactly react with another reagent.

front 8

Define analyte

back 8

The analyzed reagent in a titration.

front 9

Define titrant

back 9

The reagent used to analyze another reagent in a titration.

front 10

Define the terms equivalence point and end point.

back 10

Equivalence point: when the number of mols of acid and base are equal

End point: When the indicator changes colour

front 11

How many Hs does a monoprotic acid have? A diprotic acid? A triprotic acid?

back 11

1,2,3

front 12

What does an equivalence point look like on a titration curve?

back 12

A very large change in pH with a relatively small change in volume.

front 13

What is the generic equation for a monoprotic acid reacting with NaOH?

back 13

HA(aq)+ NaOH(aq) -> NaA(aq) + H2O(l)

front 14

What is the generic equation for a diprotic acid reacting with NaOH?

back 14

H2A(aq)+ 2NaOH(aq) -> Na2A(aq) + 2H2O(l)

front 15

What is the generic equation for a triprotic acid reacting with NaOH?

back 15

H3A(aq)+ 2NaOH(aq) -> Na3A(aq) + 3H2O(l)

front 16

If Ka= 10-4.63 then how many significant figures will the Ka have?

back 16

2 (because 10-4. 63 only has 2 figures after the decimal point)

front 17

What is the generic equation for a triprotic acid reacting with NaOH?

back 17

H3A(aq)+ 3NaOH(aq) -> Na3A(aq) + 3H2O(l)

front 18

Define A, a, b and c in the equation A=abc.

back 18

A-absorbance

a- absorptivity constant

b- cell width

c- concentration (of absorbing species)

front 19

What does the symbol %T represent in the equation A=2-log %T

back 19

Percent transmittance

front 20

Why must HCl be handled with care? (2)

back 20

It can cause severe burns and respiratory irritation

front 21

How would a blank cell for spectrometry be prepared?

back 21

With the appropriate ratios of every component except the one which causes the colour you will measure.

front 22

1 ppm = 1 ___/____ What are the missing units?

back 22

1 ppm = 1 mg/L