Chem 133 Midterm Exam complete
Latest Actual study set with Questions
and correct/verified Answers
Not significant - ANSWER-Significant or not significant? Zeroes before a number before the decimal
place.
Insignificant - ANSWER-Significant or not significant? Zeroes before a number after the decimal place.
Significant - ANSWER-Significant or not significant? Zeroes after a number to the right of the decimal
place.
Not significant - ANSWER-Significant or not significant? Zeroes following a number to the left of a
decimal place with no decimal point.
Significant - ANSWER-Significant or not significant? Zeroes following a number to the left of a decimal
place with a decimal point.
Significant - ANSWER-Significant or not significant? Nonzero numbers
Significant - ANSWER-Significant or not significant? Zeroes between nonzero numbers
Report the numbers you know and estimate one additional value. - ANSWER-When measuring volume or
mass on a triple beam balance, how do you report the correct number of significant figures?
Only report the number that is given with no estimations. - ANSWER-When measuring mass on an
electric balance, how do report the correct number of significant figures?
It having more significant figures following the decimal point. - ANSWER-What makes a measuring tool
more precise?
Divide the mass by the volume - ANSWER-How do you calculate density given the mass and volume of an
object?
Subtract the cumulative mass from the mass of the object. This is the mass of the water, which is also
the volume of the water (if not water, you must know density of liquid to solve). Subtract this volume
from the volume observed to get the volume of the material. Then divide the mass and volume of the
object. - ANSWER-How do you calculate density if given the mass of an object and the mass of that
object in water?
Thomson applied a high voltage to both a negative electrode (cathode) and a positive electrode (anode).
A ray would shine from the cathode to the anode and to the back of the tube covered in phosphors to
detect the ray (phosphor screen in VL). When he put a positively and negatively charged plate on either
side of the ray, it bent toward the positive plate. Magnets also caused the ray to be deflected. This
indicated the presence of negatively charged particles (electrons). He came up with the plum pudding
atomic structure, which was electrons surrounded by a positive "soup". - ANSWER-Thomson's Cathode
Ray Experiment
Millikan used a sprayer to spray tiny oil droplets consisting of small amounts of electrons. They would fall
down a hole in the sheet below, and he recorded how fast they fell a certain distance in the space
(terminal velocity). This allowed him to calculate the radius and then the mass of the droplets. On the
top was a positively charged plate and the bottom was a negatively charged plate. Once he recorded the
speed at which they were falling, he turned up the voltage for the plates until the drop was suspended in
air. This allowed him to determine the total charge on the drops. Using the mass and voltage, he could
Latest Actual study set with Questions
and correct/verified Answers
Not significant - ANSWER-Significant or not significant? Zeroes before a number before the decimal
place.
Insignificant - ANSWER-Significant or not significant? Zeroes before a number after the decimal place.
Significant - ANSWER-Significant or not significant? Zeroes after a number to the right of the decimal
place.
Not significant - ANSWER-Significant or not significant? Zeroes following a number to the left of a
decimal place with no decimal point.
Significant - ANSWER-Significant or not significant? Zeroes following a number to the left of a decimal
place with a decimal point.
Significant - ANSWER-Significant or not significant? Nonzero numbers
Significant - ANSWER-Significant or not significant? Zeroes between nonzero numbers
Report the numbers you know and estimate one additional value. - ANSWER-When measuring volume or
mass on a triple beam balance, how do you report the correct number of significant figures?
Only report the number that is given with no estimations. - ANSWER-When measuring mass on an
electric balance, how do report the correct number of significant figures?
It having more significant figures following the decimal point. - ANSWER-What makes a measuring tool
more precise?
Divide the mass by the volume - ANSWER-How do you calculate density given the mass and volume of an
object?
Subtract the cumulative mass from the mass of the object. This is the mass of the water, which is also
the volume of the water (if not water, you must know density of liquid to solve). Subtract this volume
from the volume observed to get the volume of the material. Then divide the mass and volume of the
object. - ANSWER-How do you calculate density if given the mass of an object and the mass of that
object in water?
Thomson applied a high voltage to both a negative electrode (cathode) and a positive electrode (anode).
A ray would shine from the cathode to the anode and to the back of the tube covered in phosphors to
detect the ray (phosphor screen in VL). When he put a positively and negatively charged plate on either
side of the ray, it bent toward the positive plate. Magnets also caused the ray to be deflected. This
indicated the presence of negatively charged particles (electrons). He came up with the plum pudding
atomic structure, which was electrons surrounded by a positive "soup". - ANSWER-Thomson's Cathode
Ray Experiment
Millikan used a sprayer to spray tiny oil droplets consisting of small amounts of electrons. They would fall
down a hole in the sheet below, and he recorded how fast they fell a certain distance in the space
(terminal velocity). This allowed him to calculate the radius and then the mass of the droplets. On the
top was a positively charged plate and the bottom was a negatively charged plate. Once he recorded the
speed at which they were falling, he turned up the voltage for the plates until the drop was suspended in
air. This allowed him to determine the total charge on the drops. Using the mass and voltage, he could
