CHM 1045 Final Exam Questions With
Guaranteed Pass Solutions.
chemistry - Answer the study of matter, its composition, its properties, and its interactions
macroscopic properties - Answer length, mass, visible properties
microscopic properties - Answer properties we can't see; need methods of indirect
measurement
scientific method - Answer observations, hypothesis, testing/collecting data, draw conclusions
theory - Answer develops as people around the world independently consistently find the
same conclusion or confirm the same hypothesis; summarization of hypothesis or group of
hypotheses, 99% sure we're right
law - Answer 100% positive it's true, won't be changed or revised
matter - Answer anything that has mass and takes up space
substance - Answer matter that has a definite constant composition and distinct properties
law of definite proportions - Answer compounds always have the same composition no matter
where it's found; percentage/ratio of elements in a compound is always the same
mixture - Answer more than one kind of compound or molecule; variable composition
homogenous mixture - Answer can't see the different parts
heterogenous mixture - Answer can visibly discern the different parts
physical properties/changes - Answer can change without changing the composition of the
,properties of solids - Answer definite shape and volume, very dense, atoms vibrate but are
stationary and low energy
properties of liquids - Answer definite volume but no definite shape, medium density, medium
energy (molecules roll around each other)
properties of gases - Answer no definite shape or volume, low density, high energy
solid --> gas - Answer sublimation
gas --> solid - Answer deposition
mass vs weight - Answer mass is the same everywhere, weight depends on gravity
SI base unit of mass - Answer kilograms (kg)
SI base unit of length - Answer meters (m)
SI base unit of time - Answer seconds (s)
SI base unit of electric current - Answer Amperes (A)
SI base unit of temperature - Answer kelvin (K)
SI base unit of amount of a substance - Answer moles (mol)
absolute numbers - Answer counts rather than measurements, conversion factors; infinite sig
figs
sig figs with addition/subtraction - Answer round to least number of decimal places
, accurate - Answer close to the true value
precise - Answer reproducible measurement
sig figs with logs - Answer mantissa of the answer should have the same number of sig figs as
the number you took the log of
sig figs with antilogs - Answer answer of an antilog should have the same number of sig figs as
the mantissa of the number being operated on
4 concepts of Dalton's atomic theory and their correctness - Answer 1. All matter is composed
of indivisible particles (atoms) (can split atoms but this is generally correct)
2. atoms and indestructible and unchangeable (can change with extraneous outside methods,
but still true)
3. all atoms of a given element are identical (false because of isotopes)
4. compounds are formed when atoms of different elements combine (true)
law of conservation of mass - Answer mass is not created or destroyed, just changed
mass of a proton/neutron - Answer 1.67 x10^-27 kg
mass of an electron - Answer 9.11 x10^-31 kg
mass of an element - Answer mass(protons) + mass(neutrons)
isotope - Answer element with a different number of neutrons
mass number - Answer protons + neutrons
atomic symbol - Answer A x
C
Guaranteed Pass Solutions.
chemistry - Answer the study of matter, its composition, its properties, and its interactions
macroscopic properties - Answer length, mass, visible properties
microscopic properties - Answer properties we can't see; need methods of indirect
measurement
scientific method - Answer observations, hypothesis, testing/collecting data, draw conclusions
theory - Answer develops as people around the world independently consistently find the
same conclusion or confirm the same hypothesis; summarization of hypothesis or group of
hypotheses, 99% sure we're right
law - Answer 100% positive it's true, won't be changed or revised
matter - Answer anything that has mass and takes up space
substance - Answer matter that has a definite constant composition and distinct properties
law of definite proportions - Answer compounds always have the same composition no matter
where it's found; percentage/ratio of elements in a compound is always the same
mixture - Answer more than one kind of compound or molecule; variable composition
homogenous mixture - Answer can't see the different parts
heterogenous mixture - Answer can visibly discern the different parts
physical properties/changes - Answer can change without changing the composition of the
,properties of solids - Answer definite shape and volume, very dense, atoms vibrate but are
stationary and low energy
properties of liquids - Answer definite volume but no definite shape, medium density, medium
energy (molecules roll around each other)
properties of gases - Answer no definite shape or volume, low density, high energy
solid --> gas - Answer sublimation
gas --> solid - Answer deposition
mass vs weight - Answer mass is the same everywhere, weight depends on gravity
SI base unit of mass - Answer kilograms (kg)
SI base unit of length - Answer meters (m)
SI base unit of time - Answer seconds (s)
SI base unit of electric current - Answer Amperes (A)
SI base unit of temperature - Answer kelvin (K)
SI base unit of amount of a substance - Answer moles (mol)
absolute numbers - Answer counts rather than measurements, conversion factors; infinite sig
figs
sig figs with addition/subtraction - Answer round to least number of decimal places
, accurate - Answer close to the true value
precise - Answer reproducible measurement
sig figs with logs - Answer mantissa of the answer should have the same number of sig figs as
the number you took the log of
sig figs with antilogs - Answer answer of an antilog should have the same number of sig figs as
the mantissa of the number being operated on
4 concepts of Dalton's atomic theory and their correctness - Answer 1. All matter is composed
of indivisible particles (atoms) (can split atoms but this is generally correct)
2. atoms and indestructible and unchangeable (can change with extraneous outside methods,
but still true)
3. all atoms of a given element are identical (false because of isotopes)
4. compounds are formed when atoms of different elements combine (true)
law of conservation of mass - Answer mass is not created or destroyed, just changed
mass of a proton/neutron - Answer 1.67 x10^-27 kg
mass of an electron - Answer 9.11 x10^-31 kg
mass of an element - Answer mass(protons) + mass(neutrons)
isotope - Answer element with a different number of neutrons
mass number - Answer protons + neutrons
atomic symbol - Answer A x
C
