Monday_07/10: Molecular and Empirical Formulae of Covalent compounds

• Chemistry
• Secondary Education

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CHEMISTRY 10

15 - Molecular & Empirical Formulae of Covalent compounds

write the chemical formula of simple compounds from the relative numbers of atoms.

write the molecular formulae of specific compounds.

write the empirical formulae of compounds.

What is the chemical formula of this covalent compound based on the relative numbers of atoms present in a model?

Molecular formula

• a formula that shows the number of atoms of each element present in a molecule of a compound

Empirical formula

• a formula for a compound that shows the simplest ratio of atoms present

Situation:

A molecule of an unknown compound Y contains the following atoms bonded covalently together:

• 2 atoms of carbon (C)
• 2 atoms of oxygen (O)
• 4 atoms of hydrogen (H)

Q1: What is the molecular formula of a molecule of Y?

Q2: What is the empirical formula of Y?

How do we write the molecular and empirical formulae of covalent compounds?

Samples: 

Write both the molecular and empirical formulae of the molecule below. Choose one and do it on your whiteboard.

WE DO it together!

Collaborative Group Work

A

B

atoms

bonded

carbon

compound

dividing

empirical

hydrogen

ionic

molecular

ratio

YOU DO it alone!

Independent Practice

Write both the molecular and empirical formulae of the molecule below. Choose one and do it in your notebook.

A

B