Quiz 16 Flashcards
- 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
all of the above
- Burning an organic material in air or oxygen.
wet ashing
dry ashing
ignition
all of the above
dry ashing
- 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
6 months
- Sample average significantly different from true value with large percent coefficient of variation (%CV).
diagnostic specificity
analytical specificity
inaccurate and imprecise
predictive value position
inaccurate and imprecise
- 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
precision
- 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
Gaussian curve
- 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
Calibrator/Standard
- Defined as the limits between what we expect a specified portion of a population lie.
Standard deviation
range
confidence interval
proficiency testing
confidence interval
- 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
NaCl(aq) + H2O(l)
- 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
NH4NO3(aq)
- It refers to adherence to a surface.
adsorption
absorption
desorption
osmosis
adsorption
- It is a particle that has the same mass as an electron but an opposite charge.
beta particle
neutrino
positron
nucleon
positron
- Which of the following indicators is yellow in acidic solution and blue in basic solution?
HpH
thymol blue
bromthymol blue
methyl orange
bromthymol blue
- A substance that is capable of acting as either an acid or a base.
buffer
amphoteric
lewis acid
lewis base
amphoteric
- Ionic solutions change the boiling and freezing points ______ nonelectrolytes.
more than
less than
the same as
inversely compared to
more than
- Which process is used to separate a mixture of hydrocarbons with different boiling points?
cracking
oxidation
fractional distillation
dehydration synthesis
fractional distillation
- During condensation polymerization, two monomers may be joined by the removal of a molecule of
carbon dioxide
oxygen
water
hydrogen
water
- Which organic compound is a weak electrolyte?
acetic acid
carbon tetrachloride
pentane
benzene
acetic acid
- Which element is a nonmetallic liquid at room temperature?
hydrogen
oxygen
mercury
bromine
bromine
- What is the product of both fermentation reactions and saponification reactions?
an ester
an alcohol
an acid
a soap
an alcohol
- 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
3-1-5-4-2
- Which compounds are isomers?
1-propanol and 2-propanol
ethane and ethanol
methanoic acid and ethanoic acid
methanol and methanal
1-propanol and 2-propanol
- 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
2 and 3
- 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.
It permits the migration of ions.
- 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
