Chemical Formulas

Chemical Formulas

Empirical and Molecular Formulas

Quantity and Quality of a Chemical Formula

• Quality: The elements that make up the compound.

• Quantity- The amount of atoms that are presents for each element within the compound.

• EXAMPLE: CO₂

• Quality: Carbon and Oxygen

• Quantity: 1 atom of Carbon and 2 atoms of Oxygen

Poll

LET'S BE HONEST: CAN YOU IDENTIFY THE QUALITY AND QUANTITY OF THE FOLLOWING: FeCl₃

• YES

• NO

Open Ended

TRY THIS ONE: What is the Quality and Quantity of : NH₄OH

TYPES OF CHEMICAL FORMULAS:

• Empirical Formula- The smallest whole number ratio in which elements can combine to form a bond. Subscripts are in simplest form and cannot be reduced any further.

  Examples-  CO₂,  CH₄, NaCl,

• Molecular Formula- Covalent Compounds form molecules, In some cases the molecular and empirical formulas are the same, for example H₂O. Examples- C₂H₆, HF, CO, CO₂

•  Structural Formula- Shows how the elements in the compound are bonded. (The shape that the compound will take, based on the way the elements are bonding.

Open Ended

What do we know about the chemical formula of NiBr₂?

First: What is the quality and quantity?

Then: How do we determine if this is an empirical formula and/or a molecular formula?

INDEPENDENT PRACTICE

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