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analytical chemistry lecture > MODULE 2 > Flashcards

MODULE 2 Flashcards

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1
Q

Avogadro’s number

A

6.022 x 10^23 particles

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2
Q

is the number of digits known exactly plus one digit whose value is uncertain

A

SIGNIFICANT FIGURES

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3
Q

How many significant figures?
(a) 0.0120 mol HCl

A

Three significant figures; 1.20×10–2 mol HCl

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4
Q

How many significant figures?
(b) 605.3 mg CaCO3

A

(b) Four significant figures; 6.053×102
mg CaCO3

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5
Q

How many significant figures?
(c) 1.043×10–4 mol Ag+

A

(c) Four significant figures; 0.000 104 3 mol Ag+

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6
Q

How many significant figures?
(d) 9.3×104 mg NaOH

A

(d) Two significant figures; 93 000 mg NaOH

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7
Q

a general measurement unit that reports the amount of solute present in a known amount of solution

A

CONCENTRATION

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8
Q

the concentration of a particular chemical species

A

MOLARITY

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9
Q

is a substance’s total concentration without regard to its specific chemical form

A

FORMALITY

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10
Q

Moles solute/ Liters solution

A

Molarity (M)

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11
Q

grams solute / 100 grams solution

A

weight percent %w/w

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12
Q

mL solute/ 100 mL solution

A

volume percent %v/v

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13
Q

grams solute/ 100 mL solution

A

weight-volume percent %w/v

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14
Q

grams solute/ 10^6 grams solution

A

ppm

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15
Q

grams solute/ 10^9 grams solution

A

ppb

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16
Q

TRUE OR FALSE: Physical units only allow the first uncertain number

A

TRUE

17
Q

HOW MANY SIGNIFICANT FIGURES?
246.320

A

6; Zeros at the end of a number with decimal point are significant

18
Q

HOW MANY SIGNIFICANT FIGURES?
1.008

A

4; ZEROES between non-zero are significant

19
Q

HOW MANY SIGNIFICANT FIGURES?
0.00340

A

3

20
Q

HOW MANY SIGNIFICANT FIGURES?
100.3

A

3

21
Q

HOW MANY SIGNIFICANT FIGURES?

0.0001

A

1

22
Q

HOW MANY SIGNIFICANT FIGURES?

350.670

A

6

23
Q

HOW MANY SIGNIFICANT FIGURES?

1.0000

A

5

24
Q

700000

A

1

25
Q

Calculate the answers to the appropriate number of significant figures.
658.0+ 23.5478 + 1345.29

A

2026.8

26
Q

Calculate the answers to the appropriate number of significant figures.
246.24 +238.278 + 98.3

A

582.8

27
Q

Calculate the answers to the appropriate number of significant figures.
32.567 +135.0 + 1.4567

A

169.0

28
Q

Calculate the answers to the appropriate number of significant figures.
23.7 x 3.8

A

90.

29
Q

Calculate the answers to the appropriate number of significant figures.
45.76 x 0.25

A

11

30
Q

Calculate the answers to the appropriate number of significant figures.
81.04 g x0.010

A

0.81

31
Q

Calculate the answers to the appropriate number of significant figures.
6.47 x 64.5

A

417

32
Q

Calculate the answers to the appropriate number of significant figures.
43.678 x 64.1

A

2.80 x 10^3

33
Q

Calculate the answers to the appropriate number of significant figures.
1.678 / 0.42

A

4.0

34
Q

Calculate the answers to the appropriate number of significant figures.
28.367 / 3.74

A

7.58

35
Q

Calculate the answers to the appropriate number of significant figures.
4278 / 1.006

A

4252

analytical chemistry lecture (4 decks)

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