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Question of the Day

 

Tuesday, 5/19/08

Answers to Friday's Organic Review Sheet

1

3

2

1

3

2

4

2

5

18 H's

6

Alkanes

7

2

8

1

9

1

10

2

11

Alkenes

12

2

13

4

14

1

15

saturated = single covalent (anes), unsaturated = double covalent (enes) / triple covalent (ynes)

16

1

17

3 and 4

18

2

19

4

20

2

21

4

22

4

23

Draw: 2 methyl butane or 2,2 dimethyl propane

24

4

25

3

26

4

27

3

28

3

29

2

30

2

31

2

32

1

33

3

34

CH3-C=O-CH3

35

4

36

CH3-CH2-CH2-COOH

37

2

38

4

39

3

40

4

41

3

42

2

43

4

44

1

45

CH3-CH2-O-CH2-CH3

46

CH3-CH2-CH2-CH2-OH

47

4

48

1

49

4

50

Thiol is like an alcohol but instead of -OH, it is an -SH

51

2

52

4

53

3

54

2

55

substitution

56

CH3-CH2-CH2-CH2-Cl

57

3

58

1

59

2

60

CH3-CH2(Br)-CH2(Br)-CH3

61

3

62

propene

63

addition

64

C: 3 x 12 = 36
H: 6 x 1 = 6
Br: 2 x 80 = 160
202 grams

65

addition

66

CH3-CH2-CH2(Cl)-CH2(Cl)

67

CH3-CH2-CH=CH2

68

2 chlorobutane

69

3

70

ester

71

4

72

esterification

73

alcohol

74

CH3-CH(OH)-CH3

75

CH3-CH2-CH2-COO-CH3

76

ethanol

77

4

 

Wednesday, 4/30/08 

SOME Answers to the REDOX Review Sheet

4) 2

8) 4

12) 2 

14) 2

17) 4 

21) 1 

24) Cu is less active than Fe 

28) 2 
31) 3

34) Anything higher than Mg

35) 12 electrons

39) from Zn to Pb

42) 2

45) ions

Thursday, 4/10/08 

SOME Answers to the Acids and Bases Review Sheet

 4) 3

 14) 4

19) 2

22) 4

27) 3

30) 1

35) both bottles would be yellow

38) choose any base from table L
42) 2

43) Va = 25.00 - 15.50 = 9.50 mL; do the same for the base.

47) 2

Thursday, 3/27/08 

SOME Answers to the Kinetics/Equilibrium Review Sheet

 4) 3

 8) 2

12) 4

16) 4

20) a catalyst lowers the activation energy

24) 2

28) 4

32) Increased pressure shifts to the side with fewest moles.

36) 2

37) 3

Monday, 3/10/08 

SOME Answers to the Solutions Review Sheet

  1. Insoluble

  2. Ba(OH)2, Sr(OH)2

  3. 4

  4. 1

  5. 3

  6. 3

  7. Black “mickey ears” should face the Cl

  8. 1

  9. decreases

10. 6-7g

11. 3

12.

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Solutions Review Sheet, # 12

Thursday, 2/28/08 

SOME Answers to the Chemistry Math Review Sheet

(3) 164g

(7) (2)35.0%

(12) (1) BeO

(16) (2) 48.5g

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(22) C10H8

(26) .25 mol

(33) (4) 32.5 

(39) (2) 1:3

(41) 6 mol

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Thursday, 2/12/08 

A hydrate is a compound that includes water molecules within its crystal structure. During an experiment to determine the percent by mass of water in a hydrated crystal, a student found the mass of the hydrated crystal to be 4.10 grams.  After heating to constant mass, the mass was 3.70 grams. What is the percent by mass of water in this crystal?

(1) 90%

(2) 11%

(3) 9.8%

(4) 0.40%

yesterday's answer = 180g

Tuesday, 2/12/08 

What is the gram formula mass of glucose?

 

(The first 2 people to give me the correct answer on paper, with ALL work shown, will receive 1 point added to their overall average. No name, No Credit.  Multiple submissions will cause you to forfeit your reward.  Submissions must be made in person directly to me in the chemistry lab, A 313 by 8 AM, Wednesday, 2/13/08, regardless of the period that you have me.)

Friday, 2/8/08 

SOME Answers to the Formula Writing and Balancing Equations Review Sheet
 

Review Sheet Clarifications:

#26 Na3AlF6

#33 2KClO3 2KCl +3O2

#34 AgNO3 + NaCl NaNO3 + AgCl

#35 (you are simply looking for 2 compounds before and 2 different compounds after)

#36 Mg + 2AgNO3 Mg(NO3)2 + 2Ag

#43 ___C6H12O6 ___ C2H5OH + ___ CO2

#45 ___C5H12 + ___O2 ___CO2 + ___ H2O

#46 ___Fe2O3 + ___ CO ___ Fe + ___CO2

(5) 1

(7) 3

(9) 4

(12) SnF2

(17) Dinitrogen Pentoxide or Nitrogen (V) Oxide

(21) MI2

(30) +4

(35) 3

(38) zinc is more active than hydrogen, copper isn't

(43)  the coefficients should be 1, 2 and 2.

 

By the way, all the questions of the day (and answers) below are from this review sheet!

yesterday's answer = 3

Tuesday, 2/5/08 

Given the balanced equation:

__Fe2O3 + __CO __Fe + __CO2 

When the equation is correctly balanced using the smallest whole-number coefficients, what is the coefficient of CO?

(1) 1

(2) 2

(3) 3

(4) 4

yesterday's answer = 4

Monday, 2/4/08 

Given the balanced equation:

AgNO3 + NaCl NaNO3 + AgCl

This reaction is classified as

(1) synthesis

(2) decomposition

(3) single replacement

(4) double replacement

yesterday's answer = 1

Friday, 2/1/08

A metal, M, forms an oxide compound with the general formula M2O. In which group on the Periodic Table could metal M be found?

(1) Group 1             

(2) Group 16

(3) Group 2             

(4) Group 17

yesterday's answer = 3

Thursday, 1/31/08

What is the oxidation state of nitrogen in NaNO2?

(1) +1

(2) +2

(3) +3

(4) +4 

 

yesterday's answer = 1

Wednesday, 1/30/08

Which pair of formulas correctly represents a molecular formula and its corresponding empirical formula?

(1) C2H2 and CH       

(2) C3H4 and CH2        

(3) C4H6 and CH

(4) C5H8 and C2H2

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