Elements & Compounds Lab Reassessment Review
Directions:
Click “Slideshow” then “From Beginning” to
view this slideshow properly.
Take notes and answer questions from
every page. Include subheadings for
each separate topic.
Write down any questions you have about
something you may not understand.
Elements & Compounds
Objectives:
1. There are billions of materials in our
universe.
2. Those pure materials are called
elements which are represented by a
symbol and models.
3. Elements combine in thousands of
ways to make compounds which are
represented by formulas and models.
An element is a substance that is made
from one kind of atom only. It cannot
be broken down into simpler substances.
atom
An element
atom
An element
A compound is a substance that is made
from two or more elements that
chemically join.
atom
A compound made up of
2 different elements
atom
A compound made up of
7 different elements
Although it is very difficult, because a
compound is made of more than one
element it can be broken down into those
separate elements.
An element
A compound made up of 3
different elements
An element
An element
Material
Made up of:
Element or
compound
Water
Hydrogen and Oxygen compound
Coal
Carbon
element
Carbon dioxide Carbon and Oxygen
compound
Oxygen
Oxygen
element
Chalk
compound
Wax
Calcium, Carbon &
Oxygen
Carbon & Hydrogen
Table salt
Sodium & Chlorine
compound
Caffeine
Carbon, Hydrogen,
Nitrogen & Oxygen
compound
compound
Material
Made up of:
Element or
compound
Water
Hydrogen and Oxygen compound
Coal
Carbon
element
Carbon dioxide Carbon and Oxygen
compound
Oxygen
Oxygen
element
Chalk
Calcium, Carbon &
Oxygen
compound
Wax
Carbon & Hydrogen
compound
Table salt
Sodium & Chlorine
compound
Caffeine
Carbon, Hydrogen,
Nitrogen & Oxygen
compound
Representing Elements &
Compounds
Objective:
To learn the symbols and recognize
models of elements and compounds.
Look in your periodic table and find the
symbols that represent the following
elements:
Sodium ……..
Iron ………..
Hydrogen ………..
Chlorine ………..
Carbon …………
Now look in your periodic table and find name
that corresponds to the following symbol:
Fe ……..
Mg ………..
Br ………..
K ………..
Li …………
Can you answer these???
Q1. The symbol of Nitrogen is:
a. Na
b. N
Q2. Hg is the symbol of:
a. Hydrogen
b. Helium
c. Ni
c. Mercury
Q3. Water is not in the periodic table because:
a. It is a liquid substance
b. It is a natural substance
c. It is a compound not an element
Yes!!!
Q1. The symbol of Nitrogen is:
a. Na
b. N
Q2. Hg is the symbol of:
a. Hydrogen
b. Helium
c. Ni
c. Mercury
Q3. Water is not in the periodic table because:
a. It is a liquid substance
b. It is a natural substance
c. It is a compound not an element
Modeling Elements
Elements can also be represented by
models. Because they are made of only one
type of atom they will be represented by
all the same shapes and colors.
H2 = Hydrogen
O2 = Oxygen
O
H
H
O
Modeling Compounds
When different elements combine they will
create a compound and usually are
represented by a different shape or color.
O
S
Cu
O
O
Compounds are also represented
by chemical formulas by
combining the element symbols
that make them up.
What elements make up this
compound?
MgCl2
1 magnesium and 2 chlorine
What elements make up this
compound?
AgNO3
1 silver, 1 nitrogen, and 3 oxygen
Draw each and label it as an Element or a Compound AND
explain why.
Now it’s your turn!
Create your own way to represent an
element and a compound.
You may draw it or build it but be sure to
turn it in with your notes.
Have fun!