Chem 112 PRACTICE Questions with
Verified Answers
true
Matches and cigarette lighters should not be lit during this experiment, as the butane gas
is highly flammable.
false
The numerical value for the R in the ideal gas law depends on the units for temperature.
95.82 million
In 2009, Texas consumed more than 3.384 billion cubic feet of natural gas. How much is this in
cubic meters? (Note: 1 foot = 0.3048 meters)
When the water level in the graduated cylinder is equal to the water level outside the
graduated cylinder
Which of the following indicates when you should stop collecting gas during the experiment?
true
All waste containing silver should be disposed of in the appropriate waste container.
true
In this experiment, you will perform a titration for chloride ions in several salt water
samples and then determine the salinity of each water sample.
It has no effect on the amount of AgNO3 needed.
When you titrate the standard NaCl solution with AgNO3, you will dilute 1 mL of NaCl solution
to a total volume of 20 mL. Suppose that instead you diluted to a volume of 30 mL. What effect
would this have on the amount of AgNO3 you will use to titrate the NaCl before you reach the
endpoint?
, true
A solution with a chloride ion concentration of 20 ppm is more dilute than a similar solution
with a concentration of 20 ppt.
0.4ppt
What is the concentration in ppt of a solution made by dissolving 20 mg NaCl into 50 mL of
water? Assume the density of water is 1 g/mL.
false
Dichlorofluoresceinate changes from pink to colorless in the presence of excess Ag+ cations.
sharpen the end-point of the titration
The purpose of adding dextrin to the titration solution is to:
1.93
The concentration of sodium chloride in your water sample can be calculated using the
following equation: VAgNO3MAgNO3 = VNaClMNaCl. If 13.55 mL of 2.14 M AgNO3 is required
to titrate 15.06 mL of an undiluted bay water sample, what is the molar concentration of NaCl
in the bay water sample? Report your answer to two digits past the decimal point.
the color of the anion of dichlorofluorescein
The pink color that appears at the end-point of the titration of your bay water sample is
caused by:
true
In this experiment, you will model some 2 step-reactions where each step of the reaction has
different reaction rates.
true
The rate constant, k, describes the rate of the reaction; the smaller the rate constant the slower
the reaction.
Verified Answers
true
Matches and cigarette lighters should not be lit during this experiment, as the butane gas
is highly flammable.
false
The numerical value for the R in the ideal gas law depends on the units for temperature.
95.82 million
In 2009, Texas consumed more than 3.384 billion cubic feet of natural gas. How much is this in
cubic meters? (Note: 1 foot = 0.3048 meters)
When the water level in the graduated cylinder is equal to the water level outside the
graduated cylinder
Which of the following indicates when you should stop collecting gas during the experiment?
true
All waste containing silver should be disposed of in the appropriate waste container.
true
In this experiment, you will perform a titration for chloride ions in several salt water
samples and then determine the salinity of each water sample.
It has no effect on the amount of AgNO3 needed.
When you titrate the standard NaCl solution with AgNO3, you will dilute 1 mL of NaCl solution
to a total volume of 20 mL. Suppose that instead you diluted to a volume of 30 mL. What effect
would this have on the amount of AgNO3 you will use to titrate the NaCl before you reach the
endpoint?
, true
A solution with a chloride ion concentration of 20 ppm is more dilute than a similar solution
with a concentration of 20 ppt.
0.4ppt
What is the concentration in ppt of a solution made by dissolving 20 mg NaCl into 50 mL of
water? Assume the density of water is 1 g/mL.
false
Dichlorofluoresceinate changes from pink to colorless in the presence of excess Ag+ cations.
sharpen the end-point of the titration
The purpose of adding dextrin to the titration solution is to:
1.93
The concentration of sodium chloride in your water sample can be calculated using the
following equation: VAgNO3MAgNO3 = VNaClMNaCl. If 13.55 mL of 2.14 M AgNO3 is required
to titrate 15.06 mL of an undiluted bay water sample, what is the molar concentration of NaCl
in the bay water sample? Report your answer to two digits past the decimal point.
the color of the anion of dichlorofluorescein
The pink color that appears at the end-point of the titration of your bay water sample is
caused by:
true
In this experiment, you will model some 2 step-reactions where each step of the reaction has
different reaction rates.
true
The rate constant, k, describes the rate of the reaction; the smaller the rate constant the slower
the reaction.
