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Unit 2 Chem. 2015 TEKS 6.5a and 6.5c
供稿人: Raiten
What can you find on the periodic
table?
the chemical formula for salt
all the compounds that exist in the universe
all the elements that have been discovered
 the number of hydrogen atoms there are in a 
molecule of water
The drawing shown here
is an example of 
a pure substance
a mixture
a compound
none of the above
4
7
5
2
How many atoms
make up the 
compound shown
here?
Which of the following represents a compound?
salt
nitrogen
oxygen
carbon
When an atom of oxygen bonds with two atoms of
hydrogen, which compound is made
O2H
CO2
H2O
C6H12O6
a.  They break down when reacting with acids
b.  they can be altered with electric current
c.  they are always metals
d.  they are considered a pure substance
Which of the following is a characteristic
of elements?
3 elements
two compounds
two elements
two atoms
This molecule of calcium
chloride contains
if it has more than one capital letter it is 
an element
How do you know if something is a compound
or an element?
if it only has one capital letter is it a compound
If it has more than one capital letter
in its chemical formula it is a compound
if it is pure it is a compound
This is the only planet supporting life and has the most 
varied surface.  
It is the densest body in the Solar System.  
It is often called the "Blue Planet."
MERCURY
SATURN
MARS
EARTH
These planets are gas planets and found 
farthest from the Sun
SATURN, URANUS, JUPITER, NEPTUNE 
MERCURY, MARS, JUPITER
EARTH, MARS, JUPITER, SATURN
SATURN, MARS, JUPITER, URANUS
element
4 elements
compound
pure substance
The formula for oxygen is O2
This tells us there are ________ elements present.
2
4
1
6
If calcium Chloride is writtenCaCl2 then
there are two compounds
it has 3 elements
it is a pure substance
there are two elements
There are _______planets
7
8
9
10
Which of these is an example of a compound?
 A, B and C
A
A, and B
B
B and C
none of the above
C
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