CHEMISTRY FINAL REVIEW WITH 100%
VERIFIED ANSWERS- LATEST UPDATE
2022-2023
intensive properties - Answer-depends on what type of matter (ex: denisty, composition,
atomic structure)
extensive properties - Answer-depends on how much matter you have (amount of
matter), ex: mass, volume, shape
homogenous mixtures - Answer-one phase (part that you can see), individual parts not
visible (ex: solutions)
heterogenous mixture - Answer-mixture does not appear the same throughout (ex:
colloids, suspenisons, and blood)
pure substances - Answer-can only be separated by chemical means
separation techniques - Answer-1.filter 2. magnet 3. distillation (separation of boiling
points) 4.hand separation 5. chromotography 6. centrifuge
law of conservation of matter - Answer-matter is not created or destroyed, it just
changes forms
accuracy - Answer-a measure of how a close measuremnet come to the actual or true
value
precision - Answer-a measure of how close a series of measurements are to one
another
percent error - Answer-(|experimental value-accepted value|/accepted value) x 100
adding or subtracting sig figs - Answer-round to the least # of decimal places
multiply/ divide sig figs - Answer-round answer to least # of sig figs
evidence of a chemical change - Answer-color change, gas, water is a new product
density - Answer-an intensive property that depends on the composition of a substance,
used to identify a substance, d=m/v
, atom - Answer-the smallest particle of an element that retains its identity in a chemical
reaction
Democritus - Answer-1st person to identiy the atom
John Dalton - Answer-1st theory to relate chemical changes to events at the atomic
level. his theory: 1. all elements are composed of tiny indivisible molecules called atoms
2. atoms of the same element are the same 3. atoms of different elements can
physically mix together 4. atoms of different elements can chemically combine to form a
compound
William Crookes - Answer-invented the cathode ray tube
J.J. Thompson - Answer-discovered the electron. Thought the atom was a positive
sphere with negatively charged electrons throughout: plum pudding model
Ernest Rutherford - Answer-found the nucleus; gold foil experiment, used (positive)
alpha particles and a narrow beam of particles directed at a sheet of gold
Neils Bohr - Answer-electrons move in a circular orbit at fixec distances from the
nucleus, an electron can gain or lose energy by changing its orbit; planetary model
CHADWICK - Answer-found neutron
Erwin Schrodinger and quantum mechanics - Answer-electron clouds
Medeleev - Answer-published a table of elements (periodic table), arranged the
elements in order of increasing atomic mass; found repating patterns in properties, and
left empy spaces in the table
Moseley - Answer-determined atomic # for each known element; arrangted the
elements in order of increasing atomic number; "father of the modern perodic table"
period - Answer-horizontal row of elements arranged in order of increasing atomic
number's
family - Answer-columns of related elements
proton - Answer-+1 charge, 1 amu, located in the nucleus
neutron - Answer-0 charge, 1 amu, located in the nucleus
electron - Answer--1 charge, 0 amu, located outside of nucleus (mass is smaller than
protons and neutrons)
VERIFIED ANSWERS- LATEST UPDATE
2022-2023
intensive properties - Answer-depends on what type of matter (ex: denisty, composition,
atomic structure)
extensive properties - Answer-depends on how much matter you have (amount of
matter), ex: mass, volume, shape
homogenous mixtures - Answer-one phase (part that you can see), individual parts not
visible (ex: solutions)
heterogenous mixture - Answer-mixture does not appear the same throughout (ex:
colloids, suspenisons, and blood)
pure substances - Answer-can only be separated by chemical means
separation techniques - Answer-1.filter 2. magnet 3. distillation (separation of boiling
points) 4.hand separation 5. chromotography 6. centrifuge
law of conservation of matter - Answer-matter is not created or destroyed, it just
changes forms
accuracy - Answer-a measure of how a close measuremnet come to the actual or true
value
precision - Answer-a measure of how close a series of measurements are to one
another
percent error - Answer-(|experimental value-accepted value|/accepted value) x 100
adding or subtracting sig figs - Answer-round to the least # of decimal places
multiply/ divide sig figs - Answer-round answer to least # of sig figs
evidence of a chemical change - Answer-color change, gas, water is a new product
density - Answer-an intensive property that depends on the composition of a substance,
used to identify a substance, d=m/v
, atom - Answer-the smallest particle of an element that retains its identity in a chemical
reaction
Democritus - Answer-1st person to identiy the atom
John Dalton - Answer-1st theory to relate chemical changes to events at the atomic
level. his theory: 1. all elements are composed of tiny indivisible molecules called atoms
2. atoms of the same element are the same 3. atoms of different elements can
physically mix together 4. atoms of different elements can chemically combine to form a
compound
William Crookes - Answer-invented the cathode ray tube
J.J. Thompson - Answer-discovered the electron. Thought the atom was a positive
sphere with negatively charged electrons throughout: plum pudding model
Ernest Rutherford - Answer-found the nucleus; gold foil experiment, used (positive)
alpha particles and a narrow beam of particles directed at a sheet of gold
Neils Bohr - Answer-electrons move in a circular orbit at fixec distances from the
nucleus, an electron can gain or lose energy by changing its orbit; planetary model
CHADWICK - Answer-found neutron
Erwin Schrodinger and quantum mechanics - Answer-electron clouds
Medeleev - Answer-published a table of elements (periodic table), arranged the
elements in order of increasing atomic mass; found repating patterns in properties, and
left empy spaces in the table
Moseley - Answer-determined atomic # for each known element; arrangted the
elements in order of increasing atomic number; "father of the modern perodic table"
period - Answer-horizontal row of elements arranged in order of increasing atomic
number's
family - Answer-columns of related elements
proton - Answer-+1 charge, 1 amu, located in the nucleus
neutron - Answer-0 charge, 1 amu, located in the nucleus
electron - Answer--1 charge, 0 amu, located outside of nucleus (mass is smaller than
protons and neutrons)
