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WAZZAP > Quiz 16 > Flashcards

Quiz 16 Flashcards

1
Q
  1. Which describes gravimetric analysis?

To measure the purity and an accurate analytical technique

It is an absolute method

Precise methods of macro quantitative analysis and possible sources of errors can be checked

all of the above

A

all of the above

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2
Q
  1. Burning an organic material in air or oxygen.

wet ashing

dry ashing

ignition

all of the above

A

dry ashing

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3
Q
  1. The maximum holding time for acid preserved samples that will be subjected to determination of metal is

3 months

1 week

6 months

48 hours

A

6 months

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4
Q
  1. Sample average significantly different from true value with large percent coefficient of variation (%CV).

diagnostic specificity

analytical specificity

inaccurate and imprecise

predictive value position

A

inaccurate and imprecise

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5
Q
  1. How well tests are reproduced. One measure is percent coefficient of variation (%CV), the smaller the %CV, the more precise the test.

precision

specificity

median

sensitivity

A

precision

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6
Q
  1. Occurs when the data set can be accurately described by the standard deviation and the mean. Occurs when the data elements are centered around the mean. Focuses on the distribution of errors.

Quality improvement

Quality control

Youden graph

Gaussian curve

A

Gaussian curve

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7
Q
  1. Is a solution that contains a knwon amount of an analyte and is used to calibrate an assay method.

Quality assurance

Quality improvement

Calibrator/Standard

Quality assessment

A

Calibrator/Standard

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8
Q
  1. Defined as the limits between what we expect a specified portion of a population lie.

Standard deviation

range

confidence interval

proficiency testing

A

confidence interval

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9
Q
  1. Predict the product of the following acid-base reaction : HCl(aq) + NaOH(aq) –> ?

H3O+(aq) + OH-

Na+(aq) + Cl-(aq)

NaCl(aq) + H2O(l)

no reaction takes place

A

NaCl(aq) + H2O(l)

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10
Q
  1. Predict the products of the following acid-base reaction : NH3(aq) + HNO3(aq) –> ?

NH2OH (aq) + HNO2(aq)

NH4NO3(aq)

NH4OH(aq)

no reaction takes place

A

NH4NO3(aq)

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11
Q
  1. It refers to adherence to a surface.

adsorption

absorption

desorption

osmosis

A

adsorption

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12
Q
  1. It is a particle that has the same mass as an electron but an opposite charge.

beta particle

neutrino

positron

nucleon

A

positron

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13
Q
  1. Which of the following indicators is yellow in acidic solution and blue in basic solution?

HpH

thymol blue

bromthymol blue

methyl orange

A

bromthymol blue

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14
Q
  1. A substance that is capable of acting as either an acid or a base.

buffer

amphoteric

lewis acid

lewis base

A

amphoteric

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15
Q
  1. Ionic solutions change the boiling and freezing points ______ nonelectrolytes.

more than

less than

the same as

inversely compared to

A

more than

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16
Q
  1. Which process is used to separate a mixture of hydrocarbons with different boiling points?

cracking

oxidation

fractional distillation

dehydration synthesis

A

fractional distillation

17
Q
  1. During condensation polymerization, two monomers may be joined by the removal of a molecule of

carbon dioxide

oxygen

water

hydrogen

A

water

18
Q
  1. Which organic compound is a weak electrolyte?

acetic acid

carbon tetrachloride

pentane

benzene

A

acetic acid

19
Q
  1. Which element is a nonmetallic liquid at room temperature?

hydrogen

oxygen

mercury

bromine

A

bromine

20
Q
  1. What is the product of both fermentation reactions and saponification reactions?

an ester

an alcohol

an acid

a soap

A

an alcohol

21
Q
  1. The following set of procedures was used by a student to determine the heat of solution of NaOH. (1) Read the original temperature of the water. (2) Read the final temperature of the solution. (3) Pour the water into a beaker. (4) Stir the mixture. (5) Add the sodium hydroxide. What is the correct order of procedures for making this determination?

1-3-5-2-4

5-4-3-1-2

3-1-5-4-2

3-5-4-1-2

A

3-1-5-4-2

22
Q
  1. Which compounds are isomers?

1-propanol and 2-propanol

ethane and ethanol

methanoic acid and ethanoic acid

methanol and methanal

A

1-propanol and 2-propanol

23
Q
  1. Given the equations 1, 2, 3 and 4 : (1) AgNO3 + NaCl  AgCl + NaNO3 (2) Cl2 + H2O  HClO + HCl (3) CuO + CO  CO2 + Cu (4) NaOH + HCl  NaCl + H2O Which two equations represent redox reactions?

1 and 2

3 and 1

2 and 3

4 and 2

A

2 and 3

24
Q
  1. Which statement best describes how a salt bridge maintains electrical neutrality in the half-cells of an electrochemical cell?

It prevents the migration of electrons.

It permits the two solutions to mix completely.

It permits the migration of ions.

It prevents the reaction from occurring spontaneously.

A

It permits the migration of ions.

25
Q
  1. When sample X is passed through a filter paper, a white residue, Y, remains on the paper and a clear liquid, Z, passes through. When liquid Z is vaporized, another white residue remains. Sample X is best classified as

an element

a homogeneous mixture

a compound

a heterogeneous mixture

A

WAZZAP (31 decks)

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