CHEM 111 Exam 1|100 Questions with Verified Answers,100% CORRECT
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Course
CHEM 111
Institution
CHEM 111
CHEM 111 Exam 1|100 Questions with Verified Answers
Qualitative Observations - CORRECT ANSWER Descriptive in nature
Ex-Changes in color and physical state
Quantitative Observations - CORRECT ANSWER Measurements
Numerical values obtained from instrumentation, glassware, and other measuring...
CHEM 111 Exam 1|100 Questions with Verified Answers
Qualitative Observations - CORRECT ANSWER Descriptive in nature
Ex-Changes in color and physical state
Quantitative Observations - CORRECT ANSWER Measurements
Numerical values obtained from instrumentation, glassware, and other measuring
devices
Varying precision and accuracy
Scalar or dimensional unit - CORRECT ANSWER SI units based on the metric system
of the English system
Numerical value - CORRECT ANSWER reflects the precision of the instrument or piece
of glassware used to make the measurement
Systematic or Determinate Error - CORRECT ANSWER Error is in the same direction
Either higher or lower than should be
Random or Indeterminate error - CORRECT ANSWER Equal probability of measure
being lower or higher than should be
Difficult to correct or find source
Standard Units of Measures (SI) - CORRECT ANSWER Length: meter (m)
Mass: kilogram (kg)
Time: second (s)
Temperature: kelvin (K)
Amount of substance: mole (mol) 6.02 x 10^23 units
Electric Current: ampere (A)
Luminous Intensity: candela (cd)
Precision - CORRECT ANSWER Agreement or closeness of a series of measured
values
Can be precise but not accurate in measurements
Accuracy - CORRECT ANSWER Agreement or closeness of measured value to actual
known value
You can have accuracy in overall measurement but not be precise
Uncertainty - CORRECT ANSWER Depends on the instrument being used
, Reported as (+/-)
Sig Fig Guidelines - CORRECT ANSWER 1. All nonzero values are significant
2. Zeroes between nonzero digits are significant
3. leading/placeholder zeroes not significant (i.e. .0043 has 2 sig figs)
4. Zeroes to the right after a decimal point are signifcant (ie. 50.0 has 3, 0.0600 has 3)
5. Zeroes to the right after a nonzero digit are not significant (ei. 7000 only has 1)
Density equation - CORRECT ANSWER D= mass/volume
Intensive physical property - CORRECT ANSWER Properties that are independent of
the amount of substance measured
Extensive physical properties - CORRECT ANSWER depend on the amount, determine
a substance's density
Energy - CORRECT ANSWER the capacity to do work
Physical or chemical changes in matter result in - CORRECT ANSWER matte either
gaining or releasing energy
Force - CORRECT ANSWER a push or pull on an object
Electrostatic force - CORRECT ANSWER the push or pull on objects that have an
electrical charge
First Law of Thermodynamics - CORRECT ANSWER energy of universe is conserved,
all matter possesses energy
Types of energy - CORRECT ANSWER kinetic and potential
endothermic change - CORRECT ANSWER heat transfers from surroundings to the
system
Exothermic change - CORRECT ANSWER heat transfers from the system to the
surroundings
Matter - CORRECT ANSWER Anything that has mass and takes up space, composed
of particles
Atoms - CORRECT ANSWER basic particles that constitute the fundamental building
blocks of ordinary matter
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