MOLECULAR FORMULA LESSON PPT CLASS OBSERVATION TOOL

1. WHAT IS LEAST COMMON
DENOMINATOR OR LCD?

2. The least common denominator (LCD) is
the smallest number divisible by all
denominators of the given set of
fractions. It is the smallest number
among the common multiples of the
denominators.

3. 2

4. 2

5. 10 22

6. 10 22

7. 2 6

8. 2 6

9. 2 5

10. 2 5

11. 5 11

12. 5 11

13. 6 18 3

14. 6 18 3

15. 6 18 3

16. 2 6

17. ACETIC ACID HAS A CHEMICAL FORMULA OF
C2H4O2

18. Glucose has a
chemical
formula of
C6H12O6

19. The empirical formula of acetic
acid and glucose is CH2O.

20. MOLECULAR FORMULA

21. LESSON OBJECTIVES
AT THE END OF THE LESSON, WE SOULD BE ABLE TO:
DEFINE MOLECULAR FORMULA
CALCULATE THE EMPIRICAL AND MOLECULAR
FORMULA OF A COMPOUND
ANALYZE A CRIME SCENE

22. MOLECULAR FORMULA
Molecular formulas give the kind and number of atoms of each element present in
the molecular compound. In many cases, the molecular formula is the same as the
empirical formula.
Determining Empirical Formulas
Steps: Rhyme:
1. Find mole amounts. Percent to mass
2. Divide each mole by the smallest mole. Mass to mole
Divide by small
Multiply 'til whole
Steps:
1. Find the empirical formula.
2. Calculate the Empirical Formula Mass.
3. Divide the molar mass by the “EFM”.
4. Multiply empirical formula by the factor.

23. Problem Example:
Vitamin C (ascorbic acid) contains 40.92 %
C, 4.58 % H, and 54.50 % O, by mass. The
experimentally determined molecular mass
is 176 amu. What are the empirical and
chemical formulas for ascorbic acid?

24. Group Activity 15 mins
Create a name of your team.
Make a chant before you present
your work in the class.

26. Group Activity Rules

30. Crime Scene Investigation: Case Profile
The victim in the following case is a 35-year old white male named Tony DeMoy.
Initial investigators say they found several signs around the death site that suggest foul
play. Four possible causes of his untimely death have been suggested by his wife who has
been ruled out as a suspect because of a proven alibi. Your task is to identify who and
what killed Tony DeMoy.

32. MOLECULAR FORMULA

44. A molecule is a
group of two or more
atoms that are
chemically bonded to
form a pure
substance.
How are
molecules
created?

45. • Identify the atoms
that make up pure
substances.
• Build a molecular
model of a
substance.
Learning
Outcomes

46. Duplicate this Canva presentation
and complete this activity with a
partner.
In each slide, build the molecule
model for each pure substance.
Use different colors to distinguish
different elements.
Add the chemical formula.
Include a fun fact for each slide.
Submit your work.
Instructions
1
2
3
4
5
6

47. Wat
er
What is
its
chemic
al
formula
?
Add a fun
fact here.
Chemical
Symbol
Chemical
Symbol
Duplicate atoms as
needed and connect
them with lines.
Add an image here.

48. Tabl
e
Salt
What is
its
chemic
al
formula
?
Add a fun
fact here.
Chemical
Symbol
Chemical
Symbol
Duplicate atoms as
needed and connect
them with lines.
Add an image here.

49. Car
bon
Dio
xide
What is
its
chemic
al
formula
?
Add a fun
fact here.
Chemical
Symbol
Chemical
Symbol
Duplicate atoms as
needed and connect
them with lines.
Add an image here.

50. Sulf
uric
Acid
What is
its
chemic
al
formula
?
Add a fun
fact here.
Chemical
Symbol
Chemical
Symbol
Duplicate atoms as
needed and connect
them with lines.
Add an image here.

51. mon
ium
Chl
orid
e
What is
its
chemic
al
formula
?
Add a fun
fact here.
Chemical
Symbol
Chemical
Symbol
Duplicate atoms as
needed and connect
them with lines.
Add an image here.

52. LET’S ANSWER
WATER TABLE SALT CARBON DIOXIDE
What fun facts did you come up with?
H O
2
CO2
NaCl
SAMPLE
FACT:
Water is the
only
substance
on Earth
naturally
found in all
three
physical
states.
SAMPLE
FACT:
TABLE SALT
IS THE
OLDEST
FORM
OF FOOD
SEASONIN
G.
IT WAS
FIRST
USED
ABOUT
5000 YEARS
AGO.
SAMPLE
FACT:
IT IS THE
FOURTH
MOST
ABUNDANT
GAS IN
EARTH’S
ATMOSPHE
RE.
O
H H
Cl
Na C
O O

53. LET’S ANSWER
SULFURIC ACID
S
O
H 4
2
SAMPLE
FACT:
IN ANCIENT
TIMES, IT
WAS
CALLED
THE “OIL OF
VITRIOL.”
IT IS A
CORROSIV
E OR
“VITRIOLIC”
SUBSTANC
What fun facts did you come up with?
Cl
NH4
AMMONIUM CHLORIDE
SAMPLE
FACT:
IT IS A
WHITE,
ODORLESS
POWDER,
ALSO
KNOWN AS
“SAL
AMMONIAC.
”
S
O O
O
O
H H
H
H
H
H
−
+
N Cl

54. RESOURCE Page
Use these icons and illustrations in your Canva Presentation.
Happy designing! Don’t forget to delete this page before presenting.
S H
N O
Cl
Na
C
Add text here
Text

55. Try this background for online class.
*Please delete this section before downloading.

56. B C
D M
for blur
for
confetti
for a
drumroll
for mic
drop
O Q
for
bubbles
for quiet
U
Any
number
from
0-9 for a
timer
for unveil
Press these keys
while on Present mode!