What is an element?
2. What is a compound?
Draw a picture of what a compound
could look like
4. How many neutrons are in Silver?
1.
3.
 Homework
is due FRIDAY
 Do Now is due FRIDAY
 Quiz is FRIDAY
 One
symbol only= Element
Ex: Na, Cl, C, H
 Multiple symbols= Compound
 Elements
or Compounds?
 We’ll organize them together.
Told ya  science
is everywhere
A pure substance made of
one kind of atom
Gold- Au
Cannot be
broken
down
GlucoseC6H12O6
Aluminum- Al
 You
know the drill.
 Listen closely, fill in your notes with the
bolded, underlined words.
 Eyes on me and the board, mouths closed.
 When
elements form compounds, they lose
their individual PROPERTIES
 Properties of compounds are DIFFERENT
from the elements that make them up.
 During the CHEMICAL REACTION that forms a
compound the properties of the elements
that make up the compound CHANGE




 NaCl
 One
Sodium atom
 One Chlorine atom
 Chlorine
is a deadly substance
 But, when bonded to Sodium- it makes salt!
Carbon
Hydrogen
Sugar: C12H22O11
Oxygen
A
chemical formula is chemical symbols and
numbers that show the number of atoms of
each element in a molecule.
 ALRIGHT- what’s a molecule?
 Let’s
practice: WE NEED OUR PERIODIC TABLE
 -NaOH
 -Sodium Hydroxide
 1. How many elements make up this
compound?
 2. What elements make up this compound?
 3. How many Sodium atoms?
 4. How many Hydrogen atoms?
 5. How many Oxygen atoms?
 6. Ratio?
 7. Total number of atoms?
 Even
if the ELEMENTS in a compound are the
SAME, if the RATIO of ELEMENTS in a
compound is different, then the compound
will have different properties.
 H2 02
 Hydrogen
Peroxide
 1. How many elements make up this
compound?
 2. What elements make up this compound?
 3. How many Oxegyn atoms?
 4. How many Hydrogen atoms?
 5. Ratio?
 6. Total number of atoms?
 15
minutes with each station activity
 Write on blank paper. LEAVE SUPPLIES intact
for next group.
Expectations:
1. Working just with
your group.
Whispering.
2. Filling your table
carefully.
1.
Copy this table on your exit ticket and fill it
out: