CHEM 100 – Chemistry – Flashcards
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Using interpolation, as we did in the lab on density of water, which of the following would represent an appropriate burette reading? |
| 9.131 ML |
The visible fog above the dry ice in the states of matter lab was composed of what? |
| WATER |
Which of the following observations casts STONGEST doubt on the hypothesis that the visible fog above the dry ice in the states of matter lab was composed of gaseous CO2? |
WHEN THE COLLER CONTAINING THE DRY IVE WAS OPENED, THERE WAS LITTLE OR NO FOG VISIBLE ABOVE THE DRY ICE |
Which of the following is true about the scientific method? |
WHEN POSSIBLE, SCIENTISTS SUBJECT EVEN HIGHLY PLAUSIBLE HYPOTHESES TO EMPIRICAL TESTING |
Which of the following is an alkali metal that will react vigorously with water?
|
POTASSIUM |
What is the charge on a lithium ion containing 3 protons and 2 electrons? |
| +1 |
Nitrogen has the atomic number 7. How many electrons does an electrically neutral atom of nitrogen have? |
| 7 |
One of the isotopes of nitrogen is nitrogen-15. How many protons are there in the nucleus of nitrogen-15? |
| 7 |
One of the isotopes of nitrogen is nitrogen-15. How many electrons are there in an electrically neutral atom of nitrogen-15? |
| 7 |
What was the name of the element referred to as the “T-Rex of the chemical elements” in the film “The Periodic Table”? |
| FLOURINE |
If the name of an ion ends in “ide” what charge will it have? |
| NEGATIVE |
The compound ammonium chloride, produced by the reaction of gaseous ammonia and hydrogen chloride gas, has the formula- |
| NH4CL |
To be a free radical, a chemical species MUST have |
AT LEAST ONE UNPAIRED ELECTRON |
T/F: A molecule of the polymer called “polyethylene” contains about half as many double bonds as it does carbon atoms |
| FALSE |
What information might not be obtained by looking at a structural formula? |
THE SHAPE OF THE MOLECULE (ANGLES OF THE BONDS) |
The SI base unit for length is |
| METER |
The SI unit for mass is |
| KILOGRAM |
Which of these is the balanced chemical equation for the formation of hydrogen gas as performed in the “States of Matter” laboratory?
|
2HCL(AQ)+ZN(S) a H2(G)+ZNCL2(AQ) |
The atmosphere contains about 78% nitrogen, which is transparent and colorless. This well-established datum casts doubt on the hypothesis of what? |
THAT THE CLOUD SEEN ABOVE THE LIQUID NITROGEN IS NITROGEN GAS |
The hypothesis (an incorrect one, as it turns out) that dry ice sublimes as it “warms up to room temperature” could be tested by doing what? |
MEASURING THE TEMP OF THE DRY ICE WITH A THERMOMETER AS SUBLIMATION OCCURS |
Suppose a vibrating slinky is vibrating with a wavelength of 14M and a frequency of 1/s/ Then the slinky is excited more vigorously so that the frequency is now 2/s. What is the new wavelength with the new frequency of 2/s? |
| 7M |
If the mass of a sample of water is measured as 2.01G, to the nearest 0.02G, then the relative uncertainty in the measurement is |
| 0.01 |
The rules for significant figures when measurements are multiplied or divided are based on the effects of- |
RELATIVE UNCERTAINTIES IN THE MEASUREMENT |
The rules for significant figures when measurements are added or subtracted are based on the effects of- |
THE ABSOLUTE UNCERTAINTIES IN THE MEASUREMENT |
If the mass of a 2.22ML sample of solution is measured as 2.58G, its density would best be reported as |
| 1.16G/ML |
A chemical bond formed by the sharing of a pair of electrons is
|
A COVALENT BOND |
Breaking chemical bonds always
|
REQUIRES ENERGY |
Forming chemical bonds always |
| RELEASES ENERGY |
The reaction H2a H+H (WHAT HAPPENS TO THE ENERGY?) |
| RELEASES ENERGY |
The reaction H2a H+H (ENDERGONIC OR EXERGONIC) |
| ENDERGONIC |
What kind of radiation is of longer wavelength than visible light, causes molecules to vibrate more vigorously, and is absorbed by some molecules in the atmosphere? |
| INFARED |
What kind of radiation is very short in wavelength, is highly penetrating, causes ionization of the matter that it passes through, and is produced by changes within the atomic nucleus? |
| GAMMA |
Which of the following colors of light has the longest wavelength? |
| RED |
Which of the following reactions requires UV radiation, and therefore can only occur during the daytime? |
CLOOCL a CLOO+CL |
In the original mechanism proposed by Rowland and Molina:
CL+03 a CLO+O2 CLO+O a CL+O2 Which species is the catalyst? |
| ATOMIC CHLORINE |
Which of the following events PERMANENTLY removes catalytically active chlorine from the stratosphere? |
MIGRATION OF HCL MOLECULES BACK INTO THE TROPOSPHERE, WHERE THEY ARE RAINED OUT DOWN TO EARTH |
CFC’s |
CARRY CHLORINE ATOMS INTO THE STRATOSPHERE, WHERE THE CHLORINE IS THEN RELEASED AND BEGINS TO DESTROY OZONE. |
The step CL+O3 a CLO+O2 |
IS COMMON TO BOTH OF THE MAJOR PROPOSED MECHANISMS FOR DESTRUCTION OF STRATOSPHERIC OZONE BY CHLORINE |
Oxides of nitrogen |
CONTRIBUTE TO DEPLETION OF STRATOSPHERIC OZONE AND INCREASE IN TROPOSPHERIC OZONE. |
Visible light cannot break up ozone |
BECAUSE IT (THE VISIBLE LIGHT) DOESN’T HAVE ENOUGH ENERGY PER PHOTON |
Ozone can |
ACT AS AN OXIDIZING AGENT |
In the spectroscopy lab, Dr. Carter’s shirt appeared red when illuminated by the flame from the air-starved Bunsen burner. It looked black when illuminated by the flame emission from the sodium atoms. What was the reason for this? |
THERE WAS NO RED LIGHT FOR THE SHIRT TO REFLECT, SINCE THE SODIUM EMITTED YELLOW, WHICH THE SHIRT ABSORBED. |
What allotropes of oxygen absorb the band of ultraviolet radiation from 242NM to 320NM? |
ONLY OZONE |
The flame emission color for copper was |
| GREEN |
For which of the following elements did the visible spectrum have both: The greatest number of visible lines overall AND The greatest number of visible lines in the long-wavelength region of the visible spectrum? |
| NEON |
The reaction NO2aNO+O |
CAN AND DOES OCCUR IN THE TROPOSPHERE |
High density polyethylene differs from low density polyethylene because |
| LOW DENSITY POLYETHYLENE HAS SHORTER CHAINS WITH MORE BRANCHING |
