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ANACHEM PRELIMS > EXPRESSING QUANTITIES & CONCENTRATIONS > Flashcards

EXPRESSING QUANTITIES & CONCENTRATIONS Flashcards

1
Q

Acronym for the French word Systeme International d’ Unites
It is the standardized system of units

A

SI UNITS

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2
Q

Base unit of Length

A

Meter

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3
Q

Base unit of Time

A

Second

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4
Q

Base unit of Mass

A

Kilogram

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5
Q

Base unit of Temperature

A

Kelvin

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6
Q

Base unit of Electric Current

A

Ampere

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7
Q

Base unit of Luminious Intensity/ Light

A

Candela

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8
Q

Base unit of amt. of substance

A

Mole

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9
Q

It is the SI unit for the amount of chemical species
Associated with a chemical formula and Avogado’s number (6.00 x 1023)

A

The Mole

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10
Q

is the mass in grams of one mole of the substance
Calculated by summing the atomic masses of all the elements appearing in a chemical formula

A

Molar Mass (M)

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11
Q

Is an invariant measure of the amount of matter in an object

A

Mass

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12
Q

Is the force of attraction between an object and its surrounding

A

Weight

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13
Q

It is the one thousandth of a mole (1/1000 of a mole)

A

The Millimole

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14
Q

Number of moles of the solute species that is contained in one liter of the solution

A

Molar Concentration (Molarity M)

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15
Q

Is the total number of moles of solute in 1 L of solution

A

Analytical Molarity

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16
Q

AKA species molarity
Molar concentration of a particular species in solution at equilibrium

A

Equilibrium Molarity

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17
Q

Frequently used to express the concentration of commercial aqueous reagent

A

Weight Percent (w/w)

18
Q
  • Commonly used to specify the concentration of a solution prepared by diluting a pure liquid solute with another liquid
A

Volume Percent (v/v)

19
Q

Often used to indicate the composition of dilute aqueous solution of solid reagents

A

Weight/Volume Percent (w/v)

20
Q

is the negative logarithm (to the base 10) of the molar concentration of that species. Thus, for the species X

A

-p-value

21
Q

is the mass of a substance per unit of volume - in SI Units, expressed as kg/L of g/mL

A

Density

22
Q

Is the ratio of the mass of a substance to the mass of an equal volume of water

A

Specific Gravity

23
Q

is the quantitative relationship among the amounts of reacting chemical species.

A

Stoichiometry

24
Q

Used to measure the central value
AKA arithmetic mean or the average

A

Mean

25
Q

Is the middle result when replicate data are arranged in increasing or decreasing order

A

Median

26
Q

describes the reproducibility of measurements—in other words, the closeness of results that have been obtained in exactly the same way

A

Precision

27
Q

indicates the closeness of the measurement to the true or accepted value and is expressed by the error

A

Accuracy

28
Q

Is the difference between the measured value and the true value

A

Absolute Error

29
Q

Is the absolute error divided by the true value

A

Relative Error

30
Q

causes data to be scattered more or less symmetrically around a mean value
affects measurement precision

A

Random Error

31
Q

causes the mean of a data set to differ from the accepted value
affects the accuracy of result

A

Systemic Error -

32
Q

usually occur only occasionally, are often large, and may cause a result to be either high or low

A

Gross Error (Outlier)

33
Q

is an occasional result in replicate measurements that differs significantly from the other result

A

outlier

34
Q

TYPES OF ERROR IN EXPERIMENTAL DATA

A

Random Error
Systemic Error
Gross Error (Outlier)

35
Q

SOURCES OF SYSTEMIC ERROR

A

Instrumental Errors
Method Errors
Personal Error

36
Q

are caused by nonideal instrument behavior, by faulty calibrations, or by use under inappropriate conditions

A

Instrumental Errors-

37
Q

arise from nonideal chemical or physical behavior of analytical systems

A

Method Errors

38
Q

result from the carelessness, inattention, or personal limitations of the experimenter

A

Personal Error

39
Q

are independent of the size of the sample being analyzed

A

Constant Errors

40
Q

Decrease or increase in proportion to the size of the sample

A

Proportional Errors

41
Q

If standard samples are not available, a second independent and reliable analytical method can be used in parallel with the method being evaluated - Independent method should differ as much as possible from the one under study

A

Independent Analysis

ANACHEM PRELIMS (3 decks)

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