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Chem 223 > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

What is length measured in?

A

Meters (m)

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2
Q

What is mass measured in?

A

Kilograms (kg)

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3
Q

What is time measured in?

A

Seconds (s)

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4
Q

What is temperature measured in?

A

Kelvin (K)

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5
Q

What is amount measured in?

A

Moles (mol)

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6
Q

What unit is used for energy, work and quantity of heat?

A

Joule (J)

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7
Q

Kilo (k)

A

10^3

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8
Q

Centri (c)

A

10^-2

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9
Q

Milli (m)

A

10^-3

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10
Q

Micro

A

10^-6

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11
Q

Nano (n)

A

10^-9

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12
Q

Pico (p)

A

10^-12

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13
Q

Femto (f)

A

10^-15

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14
Q

1 mL = cm^3

A

1

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15
Q

Which type of of uncertainty is repeatable?

A

Systematic or Deterministic Uncertainty

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16
Q

Which type of of uncertainty is repeatable?

A

Systematic or Deterministic Uncertainty

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17
Q

Which type of uncertainty affects all measurements equally?

A

Systematic or Deterministic Uncertainty

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18
Q

Which type of uncertainty is not repeatable?

A

Random or Indeterminate Uncertainty

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19
Q

Which type of uncertainty is correctable?

A

Systematic or Deterministic Uncertainty

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20
Q

Refers to reproducibility…

A

Precision

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21
Q

Refers to how close measurements are to the “true” result…

A

Accuracy

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22
Q

What is the +/- 0.02 mL in 12.35 +/- 0.02 mL called?

A

Absolute Uncertainty

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23
Q

The margin of uncertainty that is associated with a measurement is called?

A

Absolute Uncertainty

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24
Q

What does e represent e= absolute uncertainty/magnitude of measurement?

A

Relative Uncertainty

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25
What compares the absolute uncertainty to its associated measurement?
Relative Uncertainty
26
Refers to the theoretical bell-shaped distribution of measurements that occurs when all error is random…
Gaussian Distribution
27
What does the number 5 represent in this data set 1,2,3,4,5,6,7,8,9,10?
Median
28
In a data set the largest minus the smallest is…
Range
29
For addition and subtraction the uncertainty is obtained from…
Absolute uncertainty, e4=sqrt(e1)^2+(e2)^2+(e3)^2
30
To determine the relative uncertainty you…
Divide the absolute uncertainty/arithmetic answer
31
For multiplication and division what kind of uncertainty do you use?
Percent Relative Uncertainty
32
What is the first step in finding Percent Relative Uncertainty?
1. Concert absolute uncertainties to relative
33
This equation %e4= sqrt(%e1)^2+(%e2)^2+(%e3)^2 finds….
Precent relative uncertainty in multiplication and division problems
34
If the uncertainty is plus/minus .0002 the uncertainty is expressed in … sigfigs
3
35
The center of the distribution is also known as….
Mean
36
What measures the width of the distribution?
Standard Deviation
37
What does x with a line on top represent ?
Average
38
Standard deviation measures the…
Scatter of the data
39
Less scatter means bigger or smaller standard deviation?
Smaller
40
Smaller standard deviation means
More precise results
41
How do you calculate standard deviation?
Take the sqrt of the sum of each value minus the average squared and divide by the number of data values minus one
42
Standard deviation divided by the average x100
Relative standard deviation
43
The quantity n-1 in the denominator is called…
Degrees of freedom
44
For an infinite set of data the mean or “true” mean is called…
Population mean
45
Greek letter mu represents?
Population mean
46
Lowercase Greek letter sigma represents…
Standard deviation
47
The statistical measurement that of how spread out the data is known as….
Variance
48
S^2 represents
Variance
49
Within three standard deviations of the mean … percent of that data lies
99.7%
50
… determines if the two mean values of two sets of measurements are statistically different
F-test
51
If the f-test is FCalculated =standard deviation one squared divided by standard deviation two squared should s1 or s2 be the greater value?
S1
52
If FCalculated is greater than Ftable the data sets are….
Different
53
The range of values in which there is a specified probability of finding the population mean is …?
Confidence Interval
54
What does t represent in population mean= _x plus/minus ts/sqrtn?
The student’s t value
55
The statistical tool used to express confidence intervals and compare mean values from experiments is known as
Student’s t
56
Stating the means are not different is known as the ….
Null hypothesis
57
Stating that the means are not different is known as ….
Null hypothesis
58
Which statistical test determines whether or not there is an outlier in the data
Grubbs test
59
If G calculated is … than G table the data point should be rejected
Greater
60
Glass tube with graduations that measure volume of liquid delivered through the stopcock
Buret
61
Do numbers increase or decrease from top or bottom
Increase
62
The error that occurs when your eye is not the same height as the liquid in a burst is known as
Parallax error
63
64
Curved surface of liquid in the glass buret
Meniscus
65
Calibrated to contain a particular volume
Volumetric flask
66
Temperature of volumetric flasks is relevant because
Gas can expand when heated
67
Used to prepare a solution of known volume
Volumetric flask
68
Delivers known volumes of liquid
Pipet
69
Calibrated to deliver one fixed volume
Transfer pipet
70
Delivers variable volume
Measuring pipet
71
Delivers volumes of 1 to 1000 microliters
Micropipet
72
73
74
Compares absolute uncertainty with its associated measurement
Relative uncertainty
75
absolute uncertainty/magnitude of measurement is equal to
Relative uncertainty
76
In 12.35 plus/minus 0.02 mL which is the magnitude of measurement
12.35
77
In 12.35 plus/minus 0.02 mL which is absolute uncertainty
0.02
78
79

Chem 223 (1 decks)

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