CHEM 109 EXAM Exam Questions with Revised
Answers| Verified 100% Correct
physical property - ✔✔is one that can be observed and measured without changing
the identity of the substance.
physical change - ✔✔is one in which the sate of matter changes, but the identity of
the matter does not change.
international system of units - ✔✔revised metric system designed for universal use
by scientists
length (m), mass (kg), time (s),
electric current (A), temp (K), amount (mol) - ✔✔name the system of units
exact - ✔✔numbers that have defined values
inexact - ✔✔numbers obtained by any method other than counting
sig figs - ✔✔meaningful digits in a reported number
uncertain digit - ✔✔the last digit in a measured number
accuracy - ✔✔tells us how close a measurement is to the true value
, precision - ✔✔tells us how closely multiple measurements of the same thing are to
one another
conversion factor - ✔✔is a fraction in which the same quantity is expressed one way
in the numerator and another way in the denominator
density - ✔✔the ratio of mass to volume
extensive property - ✔✔depends on the amount of matter
intensive property - ✔✔does not depend on the amount of matter
mass, volume, energy - ✔✔examples of extensive properties
temperature, density - ✔✔examples of intensive properties
not significant - ✔✔zeros to the left of the first nonzero are _____
are sig if there is a decimal (9.550) - ✔✔zeros to the right of the last nonzero digit are
______
may or may not be sig (1200) - ✔✔zeros to the right of the last non zero digit that
doesn't have a decimal ____
the answer should have the sig figs of the number with the least decimal places (102.50
+ .231 = 102.73) - ✔✔in addition and subtraction explain sig figs
Answers| Verified 100% Correct
physical property - ✔✔is one that can be observed and measured without changing
the identity of the substance.
physical change - ✔✔is one in which the sate of matter changes, but the identity of
the matter does not change.
international system of units - ✔✔revised metric system designed for universal use
by scientists
length (m), mass (kg), time (s),
electric current (A), temp (K), amount (mol) - ✔✔name the system of units
exact - ✔✔numbers that have defined values
inexact - ✔✔numbers obtained by any method other than counting
sig figs - ✔✔meaningful digits in a reported number
uncertain digit - ✔✔the last digit in a measured number
accuracy - ✔✔tells us how close a measurement is to the true value
, precision - ✔✔tells us how closely multiple measurements of the same thing are to
one another
conversion factor - ✔✔is a fraction in which the same quantity is expressed one way
in the numerator and another way in the denominator
density - ✔✔the ratio of mass to volume
extensive property - ✔✔depends on the amount of matter
intensive property - ✔✔does not depend on the amount of matter
mass, volume, energy - ✔✔examples of extensive properties
temperature, density - ✔✔examples of intensive properties
not significant - ✔✔zeros to the left of the first nonzero are _____
are sig if there is a decimal (9.550) - ✔✔zeros to the right of the last nonzero digit are
______
may or may not be sig (1200) - ✔✔zeros to the right of the last non zero digit that
doesn't have a decimal ____
the answer should have the sig figs of the number with the least decimal places (102.50
+ .231 = 102.73) - ✔✔in addition and subtraction explain sig figs
