Anachem W1

Question 1

Types of Samples

Answer 1

Qualitative and Quantitative

Question 2

Determination of identity of the chemical species.

Answer 2

Qualitative

Question 3

Determination of the relative amount of the chemical species in each sample.

Answer 3

Quantitative

Question 4

Four scales of Operations

Answer 4

MACRO ANALYSIS
SEMIMICRO ANALYSIS
MICRO ANALYSIS
ULTRAMICRO ANALYSIS

Question 5

the object of the analytical procedure (ex. A blood sample)

Answer 5

sample

Question 6

the substance that is of interest in the analysis (ex. Amount of hemoglobin in the blood)

Answer 6

Analyte

Question 7

the constituents, apart from the analyte, of the given sample (ex. All the constituents of blood except hemoglobin)

Answer 7

Matrix

Question 8

Amount of analyte is more than 0.10 grams (100 mg)

Answer 8

MACRO ANALYSIS

Question 9

MACRO ANALYSIS

Answer 9

Amount of analyte is more than 0.10 grams (100 mg)

Question 9

Amount of analyte is between 0.010-0.10 grams.

Answer 9

SEMIMICRO ANALYSIS

Question 10

SEMIMICRO ANALYSIS

Answer 10

Amount of analyte is between 0.010-0.10 grams.

Question 11

Amount of analyte is 10^-4 to 10^-2 grams.

Answer 11

MICRO ANALYSIS

Question 12

MICRO ANALYSIS

Answer 12

Amount of analyte is 10^-4 to 10^-2 grams.

Question 13

Amount of analyte is less than 10^-4 grams. Considered absent.

Answer 13

ULTRAMICRO ANALYSIS

Question 14

ULTRAMICRO ANALYSIS

Answer 14

Amount of analyte is less than 10^4 grams. Considered absent.

Question 15

Considered as absent

Answer 15

ULTRAMICRO ANALYSIS

Question 16

The _______ of reagents has an important bearing on the accuracy attained in any analysis.

Answer 16

purity

Question 17

Confirms to the minimum standards set forth by the Reagent Chemical Committee of the American Chemical Society (ACS).

Answer 17

REAGENT GRADE

Question 18

The highest quality commercially available for this chemical.

Answer 18

REAGENT GRADE

Question 19

Chemicals with extraordinary purity prepared by National Institute of Standards and Technology (NIST).

Answer 19

PRIMARY-STANDARD GRADE

Question 20

a reagent that is very pure
Highest purity

Answer 20

PRIMARY-STANDARD GRADE

Question 21

Chemicals prepared for a particular or specific application.

Answer 21

SPECIAL-PURPOSE GRADE

Question 22

Ex. RTPCR

Answer 22

SPECIAL-PURPOSE GRADE

Question 23

Included among these are solvents for spectrophotometry and high-performance liquid chromatography.

Answer 23

SPECIAL-PURPOSE GRADE

Question 24

Select the best grade of chemical available for analytical work. Whenever possible, pick the _______________ that is sufficient to do the job.

Answer 24

smallest bottle

Question 25

Replace the top of every container ___________ after removing reagent. Do not rely on someone else to do it.

Answer 25

immediately

Question 26

Hold the stoppers of reagent bottles between your_______. Never set a stopper on a desktop.

Answer 26

fingers

Question 27

Never return any excess reagents to a bottle. The money saved by returning excesses is seldom worth the risk of contaminating the entire bottle.

Answer 27

True

Question 28

Never insert spatulas, spoons, or knives into a bottle that contains a solid chemical.

Answer 28

True

Question 29

Separates ions per group. Key on how we separate ions per group.

Answer 29

Precipitating Reagent

Question 30

Chemical that is added to cause the precipitation.

Answer 30

Precipitating Reagent

Question 31

Separating ions into groups.

Answer 31

Separating Reagent

Question 32

To check if ion is present or absent.

Answer 32

Confirmatory Reagent

Question 33

Wash properly apparatuses before using by washing with a ______________

Answer 33

liquid detergent

Question 34

Wash it with tap water then several small portions of ____________

Answer 34

distilled water

Question 35

________ is usually a waste of time and is always a potential source of contamination.

Answer 35

Drying

Question 36

Rinsing with _______ may help for drying and removing grease films.

Answer 36

acetone

Question 37

chlorides and nitrates can be evaporated by adding _________

Answer 37

sulfuric acid

Question 38

nitrate ion and nitrogen oxides by adding _____

Answer 38

urea

Question 39

Ammonium chloride by adding _________

Answer 39

conc. Nitric acid

Question 40

Some unwanted substances can be eliminated during ___________.

Answer 40

evaporation

Question 41

_____________ is frequently difficult to control because of the tendency of some solutions to overheat locally.

Answer 41

Evaporation

Question 42

Organic constituents can frequently be eliminated from a solution by adding ________________ and heating to the appearance of sulfur trioxide fumes

Answer 42

sulfuric acid

Question 43

Is the resulting liquid after a mixture of liquid and solid has been left to settle out or centrifuged to separate the two.

Answer 43

SUPERNATANT LIQUID

Question 44

You will have two layers solid on the bottom and __________ on the top

Answer 44

supernatant

Question 45

Medical term of supernatant liquid

Answer 45

Centrifuge

Question 46

To remove the supernatant, carefully _____ or _______ the solution away from the solid.

Answer 46

pour or pipette

Question 47

If the solid becomes re-suspended as the supernatant is removed, ___________ the sample again.

Answer 47

centrifuge

Question 48

The purpose of washing precipitates is to ensure that all interfering ____ will be washed away from the sample.

Answer 48

ions

Question 49

____________ is a device by which a centrifugal force produced by an electric motor speeds up the rate of setting of a precipitate.

Answer 49

Centrifuge

Question 50

Centrifugation speed of __ in __ minute duration ALWAYS.

Answer 50

speed of 2 in 1 minute

Question 51

Any ________ means there’s still precipitate in that case we centrifugate it again.

Answer 51

cloudiness

Question 52

When reading volume in an apparatus, always read at eye level at ______ meniscus.

Answer 52

lower

Question 53

Apparatuses used in analytical chemistry for precisely measuring volume

Answer 53

Volumetric Pipette Mohr Pipette Serological Pipette Eppendorf Micropipette

Question 54

Pipette that ends with #__ All liquids should be delivered or transferred.

Answer 54

9

Question 55

Pipette that ends with #___ Not all liquid should be transferred.

Answer 55

10

Question 56

Litmus paper changes from blue to red.

Answer 56

Acidic

Question 57

Litmus paper changes from red to blue.

Answer 57

Basic

Question 58

This is a technique wherein your solution will smell like ammonia gas.

Answer 58

Making solution Ammoniacal

Question 58

A pungent smell will tell that your solution is decidedly _____________.

Answer 58

ammoniacal

Question 59

Add one drop more of the reagent. If it is still _______ this means precipitation is not complete. So let it settle again, add one more until no more precipitate will form.

Answer 59

cloudy

Question 60

________________ is important so that the remaining ions will not interfere with the analysis of succeeding groups.

Answer 60

Complete precipitation