CHE2A Worksheet 1B PDF

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Worksheet 1B from CHE2A 2020W....

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Week 1B Worksheet Review Explain: the law of conservation of mass. What are two other laws you also learned in class? What is an isotope? Atomic Structure Element

Number of Protons

Number of Neutrons

Number of Electrons

Atomic Mass

Atomic Number

(rounded)

lithium carbon CH3COOSO3

(give total number)

(give total number)

(give total number)

(give total number)

(give total number)

(give total number)

(give total number)

(give total number)

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Fill in the blanks for the elements, round all atomic masses to the nearest whole number.

Mole How many moles are present in 34 grams of Cu(OH)2?

How many grams are there in 3.4 x 1024 molecules of NH3?

How many molecules are there in 24 grams of FeF3?

How many chloride ions are in 200.0 grams of CCl4?

Percent Composition What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen?

What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen? If the molar mass of the compound in the previous problem is 147.6 grams/mole, what’s the molecular formula?

copper (II) hydroxide Cu(OH)2

% Cu %O %H

nickel (III) sulfate Ni2(SO4)3

% Ni %S %O

Molecular Formula Write the molecular formulas of the following two compounds.

A compound with an empirical formula of C2H8N and a molar mass of 46 grams per mole.

A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole. How many carbon atoms are in morphene? A. 1 B. 15 C. 17. D. 22. E. 27

Average Atomic Mass Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium?

Titanium has five common isotopes: 46Ti (8.0%), 47Ti (7.8%), 48Ti (73.4%), 49Ti (5.5%), 50Ti (5.3%). What is the average atomic mass of titanium?

Periodic Table Which of the following is a halogen: A. F B. Rb

C. S D. Ca

E. Kr

The following two pages contain conversions, constants, equations, and a periodic table which may be useful to you. You may remove them for easy access. Conversions: 1 atm = 760 Torr = 760 mmHg = 101,325 Pa

1010 Å = 1 m = 1012 pm = 100 cm

1.00 in = 2.54 cm

1 cm3 = 1 mL

101.325 J = 1 L atm

1 lb = 453.6 g

1 cal = 4.184 J

1 gal = 3.785 L

T(K) = t(°C) + 273.15

t(°F) =9/5 t(°C) + 32

Constants: R = 8.3145 J / mol K = 0.08206 L atm / mol K

c = 2.9979 x 108 m / s

h = 6.626 x 10–34 J s

g = 9.81 m / s

NA = 6.022 x 1023 mol–1

d (H2O) = 1.00 g / cm3

m(electron) = 9.109 x 10–31 kg

RH = 2.178 x 10–18 J

m(proton) = 1.673x10-27 kg

Equations:

n = m/M

d=

E = h

=

urm s = u 2 =

Ptotal =

P

i

m V c

M=

=



n V h

p

P = dhg

=

h mu

PV = nRT

 n 2a  P +   (V − nb ) = nRT V2  

3 RT M

xp 

i

h 4

En = - Z2RH/n2

PiVi/Ti = PfVf/Tf Z eff = Z − S

ΔE = Z2RH(1/ni2 – 1/nf2)

d = P(MM)/(RT)

ΧA = nA/ntotal

KE = ½mu2 = 3/2RT

rateA/rateB = (MMB/MMA)1/2

φ = hν

KE = hν – φ

tB/tA = (MMB/MMA)1/2

λ = h/p

p = mu

Ѱn(x) = (2/L)1/2sin(nπx/L)

P1/T1 = P2/T2

M1V1 = M2V2

V1/T1 = V2/T2

P 1V 1 = P 2V 2

Solubility Rules:

1. Salts of group 1 cations (with some exceptions for Li+) and the NH4+ cation are soluble 2. Nitrates, acetates, and perchlorates are soluble 3. Salts of silver, lead, and mercury(I) are insoluble 4. Chlorides, bromides, and iodides are soluble 5. Carbonates, phosphates, sulfides, oxides, and hydroxides are insoluble (sulfides of group 2 cations and hydroxides of Ca2+, Sr2+, and Ba2+ are slightly soluble) 6. Sulfates are soluble except for those of calcium, strontium, and barium

PERIODIC TABLE Key

1

2

Atomic Number Symbol Atomic Mass Electronegativity

H 1.008 2.20

He 4.003 -

3

4

5

6

7

8

9

10

Li

Be

B

C

N

O

F

Ne

6.941 0.98

9.012 1.57

10.81 2.04

12.01 2.55

14.01 3.04

16.00 3.44

19.00 3.98

20.18 -

11

12

13

14

15

16

17

18

Na

Mg

Al

Si

P

S

Cl

Ar

22.99 0.93

24.31 1.31

26.98 1.61

28.09 1.90

30.97 2.19

32.06 2.58

35.45 3.16

39.95 -

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

K

Ca

Sc

Ti

V

Cr

Mn

Fe

Co

Ni

Cu

Zn

Ga

Ge

As

Se

Br

Kr

39.10 0.82

40.08 1.00

44.96 1.36

47.90 1.54

50.94 1.63

52.00 1.66

54.94 1.55

55.85 1.83

58.93 1.88

58.70 1.91

63.55 1.90

65.38 1.65

69.72 1.81

72.59 2.01

74.92 2.18

78.96 2.55

79.90 2.96

83.80 -

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

Rb

Sr

Y

Zr

Nb

Mo

Tc

Ru

Rh

Pd

Ag

Cd

In

Sn

Sb

Te

I

Xe

85.47 0.82

87.62 0.95

88.91 1.22

91.22 1.33

92.91 1.6

95.94 2.16

(98) 1.9

101.1 2.2

102.9 2.28

106.4 2.20

107.9 1.93

112.4 1.69

114.8 1.78

118.7 1.96

121.8 2.05

127.6 2.1

126.9 2.66

131.3 -

55

56

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

Cs

Ba

Lu

Hf

Ta

W

Re

Os

Ir

Pt

Au

Hg

Tl

Pb

Bi

Po

At

Rn

132.9 0.79

137.3 0.89

175.0 1.27

178.5 1.3

180.9 1.5

183.9 2.36

186.2 1.9

190.2 2.2

192.2 2.20

195.1 2.28

197.0 2.54

200.6 2.00

204.4 2.04

207.2 2.33

209.0 2.02

(209) 2.0

(210) 2.2

(222) -

-

Une

87

88

103

104

105

106

107

Fr

Ra

Lr

Unq

Unp

Unh

Uns

(223) 0.7

(226) 0.9

(260) -

-

-

-

-

109 -

57

58

59

60

61

62

63

64

65

66

67

68

69

70

La

Ce

Pr

Nd

Pm

Sm

Eu

Gd

Tb

Dy

Ho

Er

Tm

Yb

138.9 1.10

140.1 1.12

140.9 1.13

144.2 1.14

(145) 1.13

150.4 1.17

152.0 1.2

157.3 1.20

158.9 1.2

162.5 1.22

164.9 1.23

167.3 1.24

168.9 1.25

173.0 1.1

102

89

90

91

92

93

94

95

96

97

98

99

100

101

Ac

Th

Pa

U

Np

Pu

Am

Cm

Bk

Cf

Es

Fm

Md

No

(227) 1.1

232.0 1.3

(231) 1.5

238.0 1.38

(237) 1.36

(244) 1.28

(243) 1.3

(247) 1.3

(247) 1.3

(251) 1.3

(252) 1.3

(257) 1.3

(258) 1.3

(259) 1.3...