AIM: How do elements interact chemically to
produces new substances? (PSKI#3)
5/13/13
DO NOW:
1. Put your corrected and
signed ILS Test #2 in
the basket
2. Pick up today’s quiz
and finish it
HOMEWORK:
1. Get your progress report
signed by your parent
2. Study for tomorrow’s
quiz on PSKI#3
3. Read p. 81-85 in your PS
ILS REVIEW BOOK.
4. Answer Questions #4382 on p. 95-104 in your
ILS PS Review Book.
What is the smallest unit of matter
that still contains the properties of
matter?
 atoms
Describe the charges of a proton,
neutron, & electron.
 Proton = “+” charge
 Neutron = “0” charge
 Electron = “-” charge
Where are the protons, neutrons &
electrons located in an atom?
 Nucleus – protons & neutrons
 Outside the nucleus - electrons
Define element.
 Matter made up of only one kind
of matter
Define molecule.
 A molecule is made up of atoms
that are chemically bonded
together
How do we determine the
number of protons in an
element from the periodic table?
 # of protons = Atomic #
How do we determine the
number of electrons from the
periodic table?
 # of electrons = Atomic #
 # of electrons = # of protons
How do we determine the
number of neutrons from the
periodic table?
 # of neutrons = Atomic Mass –
Atomic number (# of protons)
What is a physical change?
Give an example.
 A change that does not
produce a new substance
and can be undone.
 Example - phase change,
tearing into small pieces
What is a chemical change?
Give an example.
 Change that produces a
new substance
 Examples- burning,
rusting
What is a mixture?
 Made up of two or more
materials mixed together
but not chemically
combined.
How can you separate a
mixture of water & sand?
 Pour off in a strainer
How can you separate a
mixture of salt and water?
 Boil & evaporate it
How can you separate a
mixture of sand and iron
filings?
 Use a magnet
What is a compound?
 Two or more elements
chemically combined.
How do you determine the number
of atoms that make up a molecule
of water?
 The subscript next to the
chemical symbol
 H2O
Identify the number of atoms of
carbon and oxygen are found in
carbon dioxide.
 CO2 = 2 carbon atoms & 1 oxygen
atom
State the law of conservation of
mass.
 Matter cannot be created or
destroyed – it can only be
rearranged
ILS Questions
Which activity is an example
of a chemical change?
(1) dissolving table salt in
water
(2) hammering aluminum into
thin sheets
(3) melting gold to make
jewelry
(4) burning wood to produce
ashes
The diagram shows an
aluminum can before and
after it was crushed.
Explain why crushing the
aluminum can is an example
of a physical change and not
a chemical change.
ILS Question
A student performed an
experiment in which 10 mL of a
strong acid was placed on a
sample of limestone. Bubbles
formed where the acid
touched the limestone. After
20 minutes, the bubbling
stopped and the surface of the
limestone appeared
unchanged.
1. Identify one observation
that shows a chemical
reaction occurred
between the acid and
the limestone.
2. Explain why limestone
buildings are weathered
by acid rain even though
the limestone sample in
this experiment did not
appear to be changed by
the strong acid.
ILS Questions
Identify one element that has
chemical properties similar to the
chemical properties of fluorine.
The chemical symbols of four
different elements are listed below.
Cd
Cu
Br
P
In which group of the Periodic Table
of the Elements are the noble gases
located?
ILS Questions
What is the atomic number of
Aluminum?
What is the atomic mass of
Phosphorus?
How many protons, electrons,
& neutrons are found in
Fluorine?
Identify one element that is a
metalloid.
ILS Questions
The diagram below shows the arrangement of atoms and
the chemical composition of a water molecule.
The table shows common elements and their chemical
symbols.
What two elements make up the water molecule?