Transcript Unit 2 Review - Cloudfront.net

Unit 2 Review
 TRUE
or FALSE
Salt (NaCl) is a pure substance and an
element.
ANSWER
 False…

pure substance and compound.
Two elements combined = compound
 Which
state of matter would take the
shape of it’s container and has a
fixed/definite volume?
ANSWER
 Liquid
 A popsicle
melting on the sidewalk is an
example of what type of change?
ANSWER
 Physical…all
phase changes (solid 
liquid  gas) are physical changes.
 “A shiny
piece of steel rusted from sitting
out in the rain.”
 Which
part of this statement represents a
physical property? Which part represents
a chemical property?
ANSWER
 “A shiny
piece of steel rusted from sitting
out in the rain.”
 “SHINY”
is physical, describing what it
looks like
 “RUSTING” is chemical, because rust has
a different composition than steel.
 Matter
changing from its liquid state to its
gaseous state is called ______.
ANSWER
 Vaporization


Boiling
Evaporation
 What
is an ion?
ANSWER
 An
atom with a positive or negative
charge.
 An atom that has lost or gained electrons.
 If
at ion has a positive charge, did it GAIN
electrons or LOSE electrons?
ANSWER
 LOSE
electrons so that the there are now
more positive protons than there are
negative electrons.
 What
charge would group 17 most likely
have?
ANSWER
 -1
 What
charge would group 2 most likely
have?
ANSWER
 +2
 How
many neutrons does Carbon-14
have?
ANSWER
 14
is the mass number of that particular
isotope of Carbon and the atomic number
of Carbon is 6, so
14-6= 8 neutrons.
 TRUE
or FALSE
To get an isotope, you fluctuate the number
of electrons.
ANSWER
 FALSE.
You would fluctuate the number of
neutrons to change the mass.
 Who
discovered protons and how? LAST
NAME, HOW?
ANSWER
 Ernest
Rutherford by shooting alpha
particles (positive particles) at a piece of
foil. The alpha particles deflected, which
showed they were hitting something else
that was positive (protons).
 Who
came up with the first atomic theory?
ANSWER
 John
Dalton
 Who
discovered electrons and how? LAST
NAME
ANSWER
 JJ
Thomson- cathode ray tube showed
electrons are emitted. Negative side of
magnet repelled (or positive side attracted)
so proved they were negative.
 What
part of the atom gives it it’s identity?
ANSWER
 Protons
 Would
spaghetti be a pure substance or a
mixture?
ANSWER
 Mixture
(heterogeneous)
 What
are the 3 particles of the atom and
their respective charges?
ANSWER
 Proton
+
 Neutron (neutral)
 Electron -
 Why
isn’t the mass of strontium-92 on the
periodic table reported as 92?
ANSWER
 The
periodic table shows average atomic
masses of all isotopes present
 How
many electrons fit on energy level 1,
2,& 3?
ANSWER
 1st
holds 2
 2nd holds 8
 3rd holds 8
 Who
created the atom model where
electrons are found on energy levels?
ANSWER
 Niels
Bohr
 Draw
the Bohr diagram for phosphorus.
ANSWER
 15
P
 16 N
 15 E
 Write



the following info in isotopic notation
Protons- 26
Neutrons- 31
Electrons- 23
ANSWER

57Fe3+
26

Atomic Number
 Mass Number
 Neutrons
 Electrons
ANSWER
 Atomic
Number- 16
 Mass Number- 33
 Neutrons- 17
 Electrons -18
 Who
discovered the neutron?
ANSWER
 James
Chadwick
 Protons-20
 Electrons-20
 Neutrons-22
 Isotope
name?
ANSWER
 Calcium-42
 Protons-20
 Electrons-20
 Neutrons-22
 Give
the correct notation.
ANSWER
 What
is the name of the element if the only
information you have is there are 35
protons?
ANSWER
 Bromine
 List
techniques for physically separating a
mixture (think about our lab)
ANSWER
 Filtering
 Using
a magnet
 Boiling
 Dissolving