Formulas for Molecules

FORMULAE AND EQUATIONS

(PART 1)

by Teacher Ruzaimah

​Sekolah Menengah Rimba

LESSON OBJECTIVES:

​1. State the formulae of the elements and compounds named in the subject content.

​2. Define the molecular formula of a compound as the number and type of different atoms in one molecule.

​

​

​1. Identify the symbol of every element ( 1st- 20 elements in the Periodic Table)​

2. Identify the symbol of Special Ions.

​3. List the type and number of elements present from the formula given.

STEPS TO SUCCESS:

​The Element

Scientist have a shorthand way of representing elements called symbols. They are used to write the formulae of molecules and compounds.

Instruction:

Please prepare your own copy of Periodic Table before we proceed with the lesson.

Multiple Choice

What is the symbol of Sodium?

• So

• Sm

• Na

• NA

Multiple Choice

What is the symbol of Nitrogen?

• Ni

• N

• NI

• Nt

Multiple Choice

What is the symbol for Iron?

• Ir

• F

• I

• Fe

Multiple Choice

What is the symbol for Helium?

• He

• H

• Li

• Hm

Multiple Choice

What is the symbol for Magnesium?

• Mn

• Mg

• M

• Mg

Multiple Choice

What is the symbol of Aluminium?

• A

• Al

• Am

• Au

Multiple Choice

What is the symbol of Potassium?

• P

• Po

• K

• Ko

Multiple Choice

What is the symbol of Iodine?

• I

• Io

• Id

• In

Multiple Choice

What is the symbol of Oxygen?

• O

• Ox

• On

• Og

Multiple Choice

What is the symbol of Argon?

• A

• Ar

• Ag

• An

Multiple Choice

What is the symbol of Copper?

• C

• Co

• Cr

• Cu

Multiple Choice

What is the symbol of Tin?

• T

• Ti

• S

• Sn

Multiple Choice

What is the symbol of Chlorine?

• Cl

• CL

• Co

• C

​​CHEMICAL FORMULAE

​ There are 2 types:

     i.        Formulae of elements                                                        

    ii.        Formulae of compounds

List the type and number of elements present from the formula given.​

Name and number of each element:          

  H = Hydrogen – 2 atoms

                                              S = Sulfur        - 1 atom

                                              O = Oxygen    - 4 atoms​

Example: Sulfuric Acid, H₂SO₄​

Multiple Choice

This molecule contains....

• 1 hydrogen

• 1 chlorine

• 1 hydrogen and 1 chlorine

• 1 hydrogen and 2 chlorine

Multiple Choice

Sodium chloride has a formula of NaCl.

How many sodium and chlorine does it has?

• 1 sodium

  1 chlorine

• 1 sodium

  2 chlorine

• 2 sodium

  2 chlorine

• 1 sodium

  0 chlorine

Multiple Choice

How many elements in this compound?

• 1

• 2

• 3

• 4

Multiple Choice

This is a diagram of water molecule.

What does the read and white atoms represent?

• 1 oxygen and 1 hydrogen and 1 sodium atom

• 1 oxygen and 2 hydrogen

• 2 oxygen and 1 hydrogen

• 2 sodium and 1 oxygen

Multiple Choice

How many types of element in this compound?

• 1

• 2

• 3

• 4

Multiple Choice

This compound contains sulfur, hydrogen and oxygen. Predict the number of these elements.

• 1 hydrogen

  2 sulfur 

  4 oxygen

• 2 hydrogen

  1 sulfur

  4 oxygen

• 4 hydrogen

  1 sulfur

  2 oxygen

• 1 hydrogen

  4 sulfur

  2 oxygen

Multiple Choice

How many types of element in this compound?

• 1

• 2

• 3

• 4

Multiple Choice

How many hydrogen atoms in this molecule?

• 1

• 2

• 3

• 4

​You can have your notes from the link given on the next slide

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