Chem lab finals (tricky only, no math) Flashcards

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created 3 weeks ago by Taiga
Tricky and specific questions from all experiments from chem 1000 except those involving stoichiometry
updated 9 hours ago by Taiga
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1

What is the law of conservation of mass?

Matter cannot be created nor destroyed, only transformed.

2

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

When reacting with water they form alkaline hydroxides

3

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

H+: 1s0

H-: 1s2

4

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

A-absorbance

a- absorptivity constant

b- cell width

c- concentration (of absorbing species)

5

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

Zinc

6

What is the purpose of phenolphthalein?

To detect the presence of a base/low pH.

7

Define titration

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

8

Define analyte

The analyzed reagent in a titration.

9

Define titrant

The reagent used to analyze another reagent in a titration.

10

Define the terms equivalence point and end point.

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

End point: When the indicator changes colour

11

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

1,2,3

12

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

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

13

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

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

14

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

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

15

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

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

16

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

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

17

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

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

18

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

A-absorbance

a- absorptivity constant

b- cell width

c- concentration (of absorbing species)

19

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

Percent transmittance

20

Why must HCl be handled with care? (2)

It can cause severe burns and respiratory irritation

21

How would a blank cell for spectrometry be prepared?

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

22

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

1 ppm = 1 mg/L