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This is all the multiple choice for our class Section 23 as well as non duplicate questions from another section
Quiz 1
Cool
When a piece of wood burns and turns into ash, what type of change is taking place?
a) Physical change
b) Chemical change
Chemical change
What happens to a substance during a physical change
It undergoes a change in composition
It remains the same substance
It reacts with other substances
It becomes a completely new substance
It remains the same substance
Express 0.000025 in scientific notation using an appropriate SI prefix multiplier
25 × 10^6
25 × 10^-6
2.5 ×10^-5
2.5 × 10^5
2.5 × 10^-5
What is the physical state of water at 100 degrees Celsius under normal atmospheric pressure
Solid
Liquid
Gas
Liquid and Gas.
Which Si prefix multiplier is equivalent to 1/1000
Milli
Kilo
Centi
Mega
Milli
Which property helps you distinguish between a salt and sugar taste
Melting point
Solubility
Reactivity
Odor
Solubility
Quiz 2
Cool
What is the primary purpose of a graduate cylinder in the chemistry Library
heating liquids
Measuring mass
Dispensing precise volumes of liquids
Storing chemicals
dispensing precise volumes of liquids
which glassware is cone-shaped with a narrow neck and is often used for mixing or holding liquids during titrations
beaker
volumetric flask
erlenmeyer flask
graduated cylinder
erlenmeyer flask
if a student needs to measure a specific volume of liquid precisely, which glassware should they use
beaker
graduated cylinder
erlenmeyer flask
volumetric flask
graduated cylinder
when using a pipette labeled as TD what does this designation mean?
the pipette is calirated to deliver the specified volume precisely
the pipette is made of tempered glass
the pipette has a tolerance level for temperature changes
the pipette is calibrated to contain the specified volume at a specific temperature
the pipette is calirated to deliver the specified volume precisely
which glassware is specifically designed to contain a precise volume of liquid often used in preparing solutions which known concentrations
beaker
graduated cylinder
burette
volumetric flask
volumetric flask
a narrow cylindrical glass tube used for accurately measuring and transferring small volumes of liquid is known as
burette
graduated cylinder
pipette
beaker
pipette
Quiz 3
cool
What is a stock solution in chemistry
A solution with a low concentration
A solution used for titrations
A concentrated solution used to prepare more dilute solutions
A solution used in qualitative analysis
a concentrated solution used to prepare more dilute solutions
how is the concentration of a stock solution typically expressed
in grams per liter (g/L)
in moles per milliliter (mol/ml)
in percent concentration (%)
in molarity (M)
in molarity
When diluting a stock solution, which formula is used to calculate the new concentration
M1V1=M2V2
M1 +V1=M2+V2
V1V2=M1M2
V1-V2=M1-M2
M1V1=M2V2
What is the purpose of using an indicator in a titration
To add color to the solution
To neutralize the analyte
To mark the end point of the titration
to increase the speed of the reaction
to mark the end point of the titration
what piece of equipment is used to deliver a precise volume of titrant in a titration
burette
pipette
flask
graduated cylinder
burette
what precaution should be taken when performing a titration to ensure accuracy
use a dirty flask for better results
record initial and final burette readings carefully
ignore the color change of the indicator
use excess titrant for faster results
record initial and final burette readings carefully
Quiz 4
cool
what type of solution does not conduct electricity
non-electrolyte
weak electrolyte
strong electrolyte
non-electrolyte
what type of compounds are typically non-electrolytes
ionic compounds
covalent compounds
metallic compounds
covalent compounds
what happens when a solution of a strong electrolyte is tested for electrical conductivity
it conducts electricity weakly
it does not conduct electricity
it conducts electricity strongly
it depends on the temperature of the water
it conducts electricity strongly
which of the following pairs consists of elements that are likely to form an ionic compound
hydrogen and oxygen
sodium and chlorine
carbon and oxygen
nitrogen and hydrogen
sodium and chlorine
which of the following is a molecular compound with covalent bonds
Sodium chloride
Water
Calcium oxide
Potassium bromide
Water
What is the role of electronegativity in determining the type of bonding between atoms
Higher electronegativity differences favor ionic bonding
Lower electronegativity differences favor ionic bonding
Electronegativity only affects metallic bonding
higher electronegativity differences favor ionic bonding
Quiz 5
cool
According to Avogadros principle how does the ideal gas law equation change if the quantity of gas (moles) is doubled
P and V both double
P and T both double
V and T both double
V doubles while P and T remain constant
V doubles while P and T remain constant
What are the correct units for the ideal gas constant (R) when pressure is expressed in atmospheres (atm) * is multiply
L*ATM/(MOL*k)
J/mol*k
L/mol*k
atm*k/mol*L
L*ATM/(MOL*k)
To balance the equation P4+O2> P4O10 what coefficient should be placed in front of oxygen?
5
7
10
12
5
In the ideal gas law what units must be used for temperature to be consistent with the ideal gas constant?
Kelvin
celsius
fahrenheit
rankine
Kelvin
If you have 4 moles of methane (Ch4) how many moles of oxygen (O2) are needed for complete combustion? (balanced equation CH4+2O2>CO2+2H2O
2 moles
4 moles
8 moles
16 moles
8 moles
If the pressure of a gas is doubled while its volume is halved what happens to the temperature of the gas assuming the amount of gas and the ideal constant remain the same
The temperature would remain constant
The temperature would double
The temperature would halve
The temperature would remain constant
Quiz 6
cool
if a solution contains both sodium sulfate (Na2SO4) and silver nitrate AgNO3 what happens when hydrochloric acid HCL is added?
Ag2SO4 precipitates
NaCl precipitates
H2So4 forms
No reaction occurs
AgSo4 precipitates
If a reaction has a theoretical yield of 50 grams and the actual yield is 40 grams what is the % yield
80%
110%
120%
125%
80%
The limiting reactant in a reaction is the one that
determines the speed of the reaction
is consumed first and limits the amount of product that can be formed
has the highest molar mass
does not participate in the reaction
is consumed first and limits the amount of product that can be formed
According to solubility rules, which of the following statements is true?
Most iodides are insoluble
Most sulfides are soluble
Most phosphates are insoluble
Most chlorides are insoluble
Most phosphates are insoluble
Using solubility rules, predict the solubility of silver bromide AgBr in water
Soluble
Insoluble
Partially soluble
Insoluble
In a chemical reaction, if the reactants and products are measured at the same conditions of temperature and pressure, the theoretical yield is:
Equal to the actual yield
Higher than the actual yield
Lower than the actual yield
Independent of the actual yield
Independent of the actual yield
Quiz 7
Cool
If the change in concentration of acetone is proportional to the change in concentration of iodine. What is the order of the reaction with respect to iodine in the iodination of acetone?
Zero
First
Second
Third
Zero
What happens to the rate of reaction when the concentration of acetone is doubled, assuming the reaction is first order with respect to acetone?
The rate remains the same
The rate doubles
The rate quadruples
The rate is halved
The rate is doubled
What is the role of an acid in the iodination of acetone
It acts as a catalyst
It acts as a reactant
It acts as a product
It has no role
It acts as a catalyst
What is the purpose of measuring the disappearance of iodine color in the iodination of acetone experiment
To measure the activation energy
To measure the rate of reaction
To measure the concentration of acetone
To measure the temperature of the reaction
To measure the rate of reaction
What is the overall order of the iodination of acetone reaction if it’s first order with respect to both acetone and hydrochloric acid
zero
first
second
third
second
What is the effect of a catalyst on the rate of a reaction
it increases the rate of reaction
it decreases the rate of reaction
it does not affect the rate of reaction
it first increases, then decreases the rate of reaction
it increases the rate of reaction
Quiz 8
Cool
What is the primary purpose of the peer review process?
To ensure the author’s writing style is engaging
to verify the author’s academic credentials
to assess the quality and validity of the research
to determine the popularity of the research topic
to assess the quality and validity of the research
who typically conducts the peer review of a research paper
the author’s friends and family
other experts in the same field
the general public
the author themselves
other experts in the same field
what does a “double-blind” peer review process mean?
both the author and the reviewers know each others identities
neither the author nor the reviewers know each other’s identities
only the author knows the reviewers’ identities
only the reviewers know the author’s identity
neither the author nor the reviewers know each other’s identities
how can the peer review process primarily benefit the author of a research paper?
it can help improve the quality of their paper
it can help increase the popularity of their paper
it can guarantee their paper will be accepted
it can help them get a job
it can help improve the quality of their paper
what is a “revise and resubmit” decision in the peer review process?
the paper is accepted for publication without any changes
the paper is rejected
the paper needs to be revised based on the reviewers comments and then resubmitted for review
the paper is published as is, but the author is asked to make some changes for future research
the paper needs to be revised based on the reviewers comments and then resubmitted for review
What is one potential problem with the peer review process?
it can lead to bias
it guarantees that all published research is valid
it is not necessary for high quality research
it is too quick
it can lead to bias
Quiz 9
Cool
A solution contains 0.5 moles of a non-electrolyte solute dissolved in 500 grams of water. What is the freezing point depression? Kf of water 1.86 C
0.93
1.86
3.72
0.186
1.86
What is the freezing point depression when 50 grams of urea are dissolved in 500 grams of water
.83
1.86
3.10
0.186
3.10
what is the primary cause of freezing point depression in a solution?
increased kinetic energy of solvent molecules
decreased vapor pressure of the solvent
addition of a non-volatile solute
enhanced hydrogen bonding between solute and solvent
addition of a non-volatile solute
the freezing point depression of a solution is directly proportional to:
the concentration of the solute
the boiling point of the solvent
the density of the solution
the molar mass of the solute
the concentration of the solute
you have two solutions the first solution is a 0.3m solution of sodium chloride in water. the second solution is a 0.3m solution of glucose in water. which solution has the greater freezing point depression?
solution one because of the greater vant hoff factor
solution two because of the lower vant hoff factor
neither solution because they both have the same concentration
neither solution because they both have the same freezing point depression constant
solution one because of the greater vant hoff factor
you have two solutions. the first solution is a 0.3m solution of sodium chloride in water. the second solution is a 0.3m solution of sodium in benzene. Which solution has the greater freezing point depression? (Water Kf 1.86 benzene 5.12)
neither solution because they both have the same vant hoff factor
neither solution because they both have the same freezing point depression constant
solution one because of the lower freezing point depression constant
solution two because of the higher freezing point depression constant.
solution two because of the higher freezing point depression constant.
Quiz 10
Cool
What is the purpose of an acid-base titration?
to determine the pH of an unknown solution
to measure the volume of an unknown solution
to determine the concentration of an unknown acid or base
to neutralize stomach acid
to determine the concentration of an unknown acid or base
during an acid base titration which point indicates that the reaction is complete?
endpoint
equivalence point
midpoint
inflection point
equivalence point
if 25.0 ml of 0.1m hydrochloric acid HCL completely reacts with 25 ml of sodium hydroxide NaOH what is the concentration of NaOH
0.025 M
0.10 M
0.20 M
0.50 M
0.10 M
Which indicator is commonly used in acid-base titrations?
phenolphthalein
bromothymol blue
methyl orange
litmus paper
phenolphthalein
Which of the following is true about a titration setup?
the analyte is in the burette, and the titrant is in the flask.
the analyte is in the flask, and the titrant is in the burette.
the indicator is added to the burette
the equivalence point always occurs when the indicator changes color
the analyte is in the flask and the titrant is in the burette
what is the purpose of a burette in a titration?
to measure the volume of the titrant
to hold the analyte solution
to add the indicator
to collect the titrated solution
to measure the volume of the titrant
Quiz 11
Cool
You have a 0.5 M stock solution of hydrochloric acid HCL. How would you prepare 100 ml of a 0,1 M diluted solution?
DIlute 50 mL of the stock solution with 50mL of water
dilute 10 mL of the stock solution with 90 mL of water.
Dilute 20 ml of the stock solution with 80 mL of water.
Dilute 5 ml of the stock solution with 95 ml of water.
dilute 20 mL of the stock solution with 80 mL of water.
When selecting a wavelength for UV-Vis spectroscopy, which color of light corresponds to the longest wavelength?
red
green
blue
violet
Red
What is the correct order of the following interior components of a typical specrometer: sample, detector, wavelength selector, readout system, light source.
sample detector wavelength selector readout system light source
light source wavelength selector sample detector readout system
light source sample wavelength selector detector readout system
detector light source wavelength selector sample readout system
light source wavelength selector sample detector readout system
if a solution has a red color, what wavelength range in nm would be an appopriate selection to determine its absorbance?
650 nm
420 nm
490 nm
620 nm
490 nm
What is the main function of the detector in a spectrometer?
provides the light beam for analysis
measures the intensity of light after passing through the sample
separates different wavelengths of light
holds the sample for analysis
measures the intensity of light after passing through the sample
you want to prepare 250 ml of a 0,.02 M potassium permanganate KMnO4 solution If you have a .1 M stock solution, how much of the stock solution should you use?
5 ml
25 ml
50 ml
125 ml
50 ml
Note 
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