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Chem Exam 1 > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

What are the 5 base units?

A

Length, mass,volume, temperature, time

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2
Q

What numbers are significant?

A

Non zero numbers, zeroes between numbers, exact numbers

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3
Q

How do you determine s.f. If there is a decimal?

A

Start on the right and count to the left until leading zeroes

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4
Q

How do you determine sf if there is no decimal?

A

Start on the left and count right until trailing zeroes

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5
Q

What is an example of an exact number definition

A

A dozen = 12
100cm=1cm
100yrs = 1century

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6
Q

Exact numbers have _____ Significant figures

A

Infinite

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7
Q

179 has now many sf.

A

3

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8
Q

2001has how many s.f.?

A

4

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9
Q

How many sf does 300 have?

A

1

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10
Q

How many s.f.in 1051000

A

4

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11
Q

How many s.f. In 0.0001200

A

4

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12
Q

How many sf. In 100.01?

A

5

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13
Q

How many in 50.0

A

3

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14
Q

How many in 50.

A

2

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15
Q

Round 1397 to 2 s.f.?

A

1400

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16
Q

Round 0.00121 to 2 s.f.

A

0.0012

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17
Q

Round 3.14499999 to 3 s.f.

A

3.14

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18
Q

1.293+ 11.1+3.21=

A

15.6

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19
Q

4.245+1.20=

A

5.45

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20
Q

165+0.019

A

165

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21
Q

1400 + 3

A

1403

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22
Q

When doing the line trick when adding and subtracting in big whole numbers where do you draw the line?

A

Where repeating zeroes begin

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23
Q

1400 - 175

A

1225

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24
Q

150.73 - 24.12

A

126.61

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25
Q

How do you find significant figures when multiplying and dividing?

A

You round to the least number of significant figures

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26
Q

(2.97)(4.3)

A

13

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27
Q

17129/213

A

80.4

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28
Q

(17.1)(2.9)

A

50.

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29
Q

1000/25

A

40

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30
Q

How do you do scientific notation?

A

You write first nonzero number followed by a decimal and the rest of the sig, figs.

Then you indicate how many places you moved the decimals by using powers of 10

Use positive for big numbers and negative for small

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31
Q

Write in scientific notation: 1050000

A

1.05 x 10^6

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32
Q

Write in scientific notation: 24000000

A

2.4 x 10^7

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33
Q

Write in scientific notation: 0.0000452

A

4.52 x 10^-5

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34
Q

Write in scientific notation: 0.0001200

A

1.200 x 10^-4

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35
Q

(1.45 x 10^8)(3.029 x 10^7)

A

4.39 x 10^15

36
Q

3.940 x 10^-6 / 2.1 x 10^7

A

1.9 x 10 ^-13

37
Q

When adding and subtracting with scientific notation _____ the number first

A

Expand

38
Q

When expanding, if the exponent is negative move it to the _____

A

Left

39
Q

Which is correct when adding/subtracting with scientific notation

A. 2.91 x 10^-2 - 1.3 x 10^-3
B. 0.0291 - 0.0013

A

B.

40
Q

Abbreviation for giga

A

G

41
Q

Abbrevation for mega

A

M

42
Q

Abbreviation for kilo

A

k

43
Q

Abbreviation for centi

A

Lowercase C

44
Q

Abbreviation for milli

A

Lowercase m

45
Q

Abbreviation for micro

A

Mu

46
Q

Abbreviation for nano

A

Lowercase n

47
Q

Giga=

A

10^9

48
Q

Mega=

A

10^6

49
Q

Kilo=

A

10^3

50
Q

Centi=

A

10^-2

51
Q

Milli =

A

10^-3

52
Q

Micro =

A

10^-6

53
Q

Nano=

A

10^-9

54
Q

What does “per” mean in math?

A

Divide

55
Q

What does “of” mean in math?

A

Multiply

56
Q

Which is a unit factor?
A. 100cm = 1m
B. 100cm / 1m

A

B.

57
Q

15mg is how many grams?

A

0.015g

58
Q

2.21 km is how many meters?

A

2210 m

59
Q

1.35 x 10^4s is how many Ms

A

1.35 x 10^-2 or 0.0135

60
Q

1.27x10^8 microliters is hiw mang GL

A

1.27 x 10^-7 GL

61
Q

3.74 x 10^7 nm is how many cm

A

3.74

62
Q

For metric to metric conversions what gives you sig. Figs?

A

Original # will automatically give sig. Figs.

63
Q

For metric to english (vice versa) you have to _____ about the sig. figs.

A

Worry

64
Q

If the speed limit is 55mph what is this in m/s ? ( 1 mile is approximately 1.61 km)

A

24.6 m/s

65
Q

1 km = how many meters

A

1,000

66
Q

2.54 cm =

A

1 inch

67
Q

1cm^3 =

A

1mL

68
Q

Volume =

A

Length x width x height

69
Q

A backpack has a length of 2.0 in., width of 8.0 in, and height of 13.0 in how big is the backpack in liters

A

3.4 L

70
Q

To find volume of irregular solid what do you do?

A

Subtract difference of the cylinder before adding an object and after

71
Q

A cup has a weight of 123.149g when empty and 136.714g when filled with water. What is the mass?

A

13.565 g

72
Q

Density =

A

Mass / volume

73
Q

A block of iron is 600.0 cm^3 with a mass of 3510g what is the density?

A

5.85 g/ cm ^3

74
Q

How many mL does a 45.0 g block of iron take up? (D= 2.70 g/cm^3)

A

16.7mL

75
Q

Definition of temperature

A

Average kinetic of the molecules of the system

76
Q

What is considered freezing and boiling in farenheit?

A

32,212

77
Q

Formula for farenheint

A

9/5 Celcius +32

78
Q

Formula for celcius

A

5/9 (farenheit-32)

79
Q

Formula for kelvin

A

Celcius + 273

80
Q

Formula for percent composition

A

% of A = amount of A/total amount x 100

81
Q

What is the basic unit for each of the following physical quantities in the metric system: length,, mass, volume, time

A

Meter, gram, liter, second

82
Q

State the quantity that is measured using the following instruments : metric ruler, platform balance, graduated cylinder, stopwatch

A

Length, mass, volume, time

83
Q

A sterling silver spoon has a mass of 65.5 g and contains 7.50% more copper. Find the mass of copper in the spoon.

A

7.50/100 x 65.5 = 4.91 g

84
Q

If a solution contains 255 mL of ethanol and 375 mL of water, what is the percent of ethanol in the solution

A

40.5% of solution is ethanol

85
Q

A sheet of aluminum foil measures 75.0 cm by 35.0 cm. If the volume is 5.00 cm^3 what is the thickness of the foil?

A
  1. 0x35.0=2625
  2. 0/2625= 0.001904
  3. 90 x 10^-3
86
Q

In a scientific notation if you move the decimal to the right is it positive or negative???

A

Negative

Chem Exam 1 (1 decks)

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