CHEM LAB FINAL
CHEM Lab Final Quiz
Prepare for your Chemistry Lab Final with this comprehensive quiz designed to test your knowledge on essential lab concepts and academic integrity standards. Whether you are reviewing for the exam or refreshing your understanding of key principles, this quiz covers a range of topics relevant to your coursework.
Key Features:
- 49 Engaging Questions
- Covers a Variety of Chemistry Topics
- Instant Feedback on Your Responses
For Lab Exercise #1, you will be looking for an article publishes in the news media sometime in 2022. What is the requires subject area for the article you will choose?
Science
Entertainment
Politics
Religion
Which criterion is required for the article you will select from the news media for Lab Exercise #1?
It must have been written by Kim Kardashian
It must be more than 20,000 words
It must come from a highly biased news source
It must contain an "expert" opinion
While completing your assignment essay for Lab #1 Exercise, which of the following types of academic integrity violations should you avoid?
Plagiarism
All of these
Making up reference for citations
Paying someone else to write your essay
Copying an essay from an online source
According to the syllabus, what grade will you receive for the assignment, if you violate the academic integrity standards while completing Lab Exercise #1?
Zero
Extra credit
Full credit with a warning
Half credit
What is the final deadline for signing and uploading the safety contract for CHEM 1125
Halloween
Winter break
Midnight 10/01
Midnight 09/18
You have samples of three different solids as shown below. All three samples occupy the same volume. Which sample has the greatest density? Sample 1 (mass = 19.743 g) Sample 2 (mass = 11.232 g) Sample 3 (mass = 15.977 g)
Sample 1
Sample 2
Sample 3
All samples have the same density
You have three samples of liquid as shown below. All three samples have the same mass. Which liquid has the lowest density value? Sample 1 (volume = 25.64 mL) Sample 2 (volume = 73.27 mL) Sample 3 (volume = 51.22 mL)
Sample 1
Sample 2
Sample 3
All samples have the same density
You are given samples of two different compounds, one liquid and one solid. Which sample has the greater density?
It depends on the relative sizes of the samples of solid and liquid
The solid sample has greater density
The liquid sample has greater density
Density depends on more than physical state, so it is impossible to know without additional information about the compounds
It is impossible to perform an "error free" experiment in the laboratory that generates "perfect" data because
All measurements contain error in the last digit or significant figure.
No measuring tool (e.g., balance, ruler, graduated cylinder, et al.) is perfectly calibrated.
We work at the "macro" level in the lab (using moles of molecules) and therefore we cannot keep track of every last atom or molecule of the compounds we are measuring.
All of the above
A sample of copper is placed in a container of colorless radon gas, and instead of sinking to the bottom of the container, the copper floats near the top. What can you conclude form this experiment?
The density of radon is less than the density of copper
Copper is a gas
Copper is a solid
The density of copper is less than the density of radon.
When you heat an iron rod, it eventually starts to glow - at first red and then eventually "white hot" as the temperature rises. Why is red the first visible color instead of green or violet?
The light given off by the iron isn't actually "red", it's just heat being released
Red light has the lowest energy of all the colors in the visible region
Violet and green are also present when the rod starts to glow, but red is the stronger, higher energy light and overpowers the other colors.
Red light has the highest energy of all the colors in the visible region
Why does mercury (80 electrons) show only three strong lines in the visible spectrum, while neon (10 electrons) shows more than a dozen lines?
Most electronic transitions result from the excitation of valence electrons (electrons in the outermost orbitals)
The number of lines in the visible region corresponds with the energy gaps between available orbitals, not the number of electrons
Energy gaps between orbitals vary from one element to another, depending on the electron configuration and overall number of electrons.
All of these answers are correct
Bill Nye the Science Guy was particularly impressed by the red light given off by strontium. What is one common use for this brilliant red color?
It is used to make candles glow red.
It produces the color red we see in fireworks
It is the prime component of tomato skins
It is used as a dye for fake blood in movies
Why is it important that you not look directly at the sun with your spectroscope?
It's not important to avoid looking directly at the sun - I do it all the time!
The intensity of the sun's radiation will melt the spectroscope
The spectroscope will focus the sun's radiation and potentially burn the skin on your face.
Radiation from the sun will damage your retina and the tissues within your eye.
At one end of the electromagnetic spectrum, gamma waves have the highest energy (high frequency and short wavelength). At the opposite end, radio waves have the lowest energy (low frequency and long wavelength). Which type of radiation travels more quickly to the earth from the sun?
Gamma and radio waves travel to the earth at the same speed
Radio waves travel to earth more quickly due to the distance covered by their long wavelength.
It depends on which set of waves has greater intensity.
Gamma waves travel to earth more quickly due to their high energy.
Why has the use of synthetic detergents like "sodium lauryl sulfate" been strictly curtailed in the U.S. And elsewhere?
All of these answers are correct.
These molecules do not degrade properly in wastewater treatment plants.
When released to the environment, these molecules cause foaming in streams, lakes, and oceans.
Scientists have designed better (greener, more effective, less environmentally harmful) molecules for use in detergents.
Soap molecules are typically quite large. Why are they able to dissolve in water?
Soap molecules are totally nonpolar like water.
Soap molecules have a highly polar/ionic portion that helps dissolving by interacting with water molecules.
Soap molecules have a nonpolar tail that easily dissolves.
Soap molecules are broken up by "dirt" and dissolve more easily.
Phosphates used to be common additives in detergents. Why is this no longer the case?
It's important to address the broader impact of the chemicals we release into the environment.
Scientists have developed better alternatives.
Industry, scientists, and politicians worked together to address the envrionmental impacts of phosphates.
All of these answers are correct.
Why are starting materials like coconut oil and ethanol considered "green"?
Both coconut oil and ethanol are toxic.
Both coconut oil and ethanol cause environmental problems like foaming in streams and eutrophication of ponds.
Coconut oil and ethanol aren't really "chemicals"; they are just food products we are using in the lab.
Both coconut oil and ethanol are renewable.
Why is glycerol an example of a "useful by-product"?
It is highly water-soluble.
It is non-toxic.
It can be isolated and used for many other applications.
All of these answers are correct.
Of all the electronic "domains", why do lone pairs take up the most space around a central atom?
Lone pairs DO NOT take up the most space; they take up the least space around the central atom.
The amount of space required by a lone pair varies according to the electronegativity values and may require less space than bonding pairs.
Non-bonding electron pairs don't occupy a specific region; they are free to move around the central atom within their defined quantum shells.
Lone pairs are "non-bonding" and therefore their orbital is not being pulled and elongated by the positively charged nucleus of another atom.
Which electronic "domain" requires the least amount of space around the nucleus of an atom?
Triple bond
Double Bond
Single bond
Lone Pair
Which element is unable to expand its octet in a formal Lewis structure?
Xe
N
Br
S
Based on the VSEPR model, molecules have specific three-dimensional geometries. What determines the geometry for a given molecule?
Number of electronic "domains".
Shapes of the atomic and molecular orbitals.
Repulsion between electrons.
All of the above
Why does it make sense that noble gas elements like xenon only form compounds with highly electronegative elements like fluorine or oxygen?
Electronegative elements like fluorine and oxygen like to give up electrons.
Noble gases share their electrons freely.
Noble gases have low ionization energies.
Only strongly electronegative elements can pull hard enough to cause unreactive noble gases to share their electrons.
Which physical phase could not be used as the "mobile phase" in a chromatography experiment?
All of these could be used as mobile phases, depending on the type of chromatography.
Gas
Liquid
Solid
Which of the following molecular properties could be exploited to distinguish between different types of substances in a chromatography experiment?
Size
Polarity
Charge
All of these properties could be exploited.
Why is water considered a "green" solvent?
It is expensive
It is toxic
It harms the environment
None of the above
Why is it required that you only make markings on chromatography paper with a dull pencil?
All of the above
Sharp pencils may tear the paper.
Ink may smear and obscure the results from the dye samples.
Ink actually contains dye molecules, while graphite does not.
Which of the following does not fit into the category of intermolecular forces?
London Dispersion Force
Hydrogen bonding
Dipole-dipole interactions
Covalent bond
Which of the following is the weakest type of interaction?
Ionic bonding
Dipole-dipole interaction
London Dispersion Force
Hydrogen bonding
What is the primary reason that energy is absorbed during the liquid-to-vapor phase transition?
Energy is needed to offset (overcome) the intermolecular forces in a liquid.
Energy is needed to make the intermolecular forces stronger.
Energy is needed to break the covalent bonds in a liquid.
Vaporization only occurs at a specific elevated temperature.
In next week's experiment, you will be measuring temperature as it drops during the evaporation of liquids. Why does the measured temperature decrease?
The temperature being measured is that of a metal probe, and it cools down after being submerged in hot liquids.
The temperature being measured is that of a metal probe, not the liquid itself. Energy is transferred from the probe to the liquid as it evaporates.
The temperature being measured is that of a metal probe, not the liquid itself. Energy is transferred to the probe from the liquid as it evaporates.
The temperature being measured is that of a metal probe, and metal always feels cool to the touch.
Why is ethanol considered a "Green" solvent?
It is renewable.
It is relatively non-toxic.
It is relatively inexpensive.
All of these answers are correct.
Why is it important to avoid placing the heated ceramic crucible directly on the laboratory bench?
The temperature difference may shatter the crucible.
It will be easier to knock over the crucible (and possibly be burned by touching it) if it's placed on the lab bench.
It will burn the bench top, leaving a permanent mark.
All of the above
Which of the following is NOT true about the inclusion of water molecules in the crystal lattice of an ionic compound?
Water molecules occupy specific, fixed positions in the crystal lattice.
Water molecules are positioned randomly throughout the crystal lattice.
The partial negative side of water molecules are positioned near the cations of the ionic compound.
The partial positive side of water molecules are positioned near the anions of the ionic compound.
What is the correct name for the following compound: NiCl2.5H2O ?
Nickel chlorate pentahydrate
Nickel (II) chlorate quintahydrate
Nickel dichloride quintahydrate
Nickel chloride pentahydrate
Most of the time, hydrates of salts are a different color than the respective anhydrous salts. What is the explanation for this?
Color is dependent on molar mass; more water means more mass and more vivid color.
Water molecules donate electrons which neutralize metal cations.
The inclusion of water molecules in the crystal lattice changes the relative energies of metal electron orbitals.
Water is highly colored and interacts with the anhydrous color of the ionic compound.
Why is it important to continue cycles of heating the ionic compounds until a constant mass is recorded?
Different salts contain different amounts of water and some may take more heating than others to be sure all water is removed.
All of the above
Incomplete removal of water from the crystal lattice will lead to erroneous stoichiometric calculations.
Recording two consecutive masses that are nearly equal means that all the water has been removed through the heating process.
Oxidation-reduction reactions are chemical reactions that always include
Transfer of electrons from one species to another.
Phase changes
The generation of colored species.
Decomposition of one molecule into two or more parts.
Which of the following metals is most likely to give up its valence electrons to form a cation?
Silver
Sodium
Gold
Copper
Why are bubbles created in this experiment?
Hydrogen gas (H2) is being generated.
Water bubbles are always seen during chemical reactions in aqueous solution.
The solution will be boiling.
Gaseous copper (Cu) will be generated.
Which fundamental stoichiometric concept is the basis for your determination of the unknown copper salt?
All of the above
Percent composition by mass
Balanced equation
Conservation of mass
Proper set-up of the filtration apparatus requires that the filter paper completely cover all holes in the Buchner funnel. Why is this?
In order to ensure a strong vacuum seal.
So no copper product is lost through the funnel.
So that the reaction stops completely.
In order to most effectively catch any remaining hydrogen bubbles.
If the best tool you have for measuring length shows mm as the smallest lines (no lines in between), which of the following measurements could be correct?
75. mm
0.75mm
75.0 mm
7.5 mm
A student attempts to accurately measure 250 mL of water, using a graduated cylinder. Which set of results below shows the best precision?
23.41 mL, 26.22 mL, 25.16 mL
25.1 mL, 24 mL, 28.2 mL
23.44 mL, 23.37 mL, 23.41 mL
22.13 mL, 27.98 mL, 33.23 mL
If the true value for a measurement of mass is 19.705 g, which of the measurement below is the most accurate?
19.650 g
19.699 g
19.715 g
All have the same degree of accuracy
How many significant figures are there in the measurement of 0.020300 kg?
5
3
6
4
When collecting data in a laboratory experiment, a student conducts ten trials (repetitions) of the same measurement? What is the purpose of conducting multiple trials?
Multiple trials provide a measure of experimental precision
The student is probably new to the lab and repeats the measurement until they feel happy with the result
Multiple trials provide a measure of both experimental precision and accuracy
Multiple trials provide a measure of experimental accuracy
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