Empirical and Molecular Formula Chemistry

Empirical Formula

100

a chemical formula of a compound that gives the proportions of the elements present in the compound

What is the empirical formula?

200

What does the Empirical Formula tell us?

This formula tells us the simplest or most reduced ratio of elements in a compound.

300

What do we need to do to know the Moles of an atom?

We need to divide the percentage of the element by the atomic mass.

400

What does an empirical formula not tell you?

 The empirical formula does not show the actual number of atoms.

500

What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass?

S₃O₄

Random Trivia

100

This person painted the Mona Lisa

Leonardo da Vinci

200

This planet is the largest in our solar system

Jupiter

300

When listed in alphabetical order, this US state comes last

Wyoming 

400

This is the vegetable that Shrek compared himself to

An onion

500

These are the names of Ms. Compton's children

Ember and Aspen

Percent Composition of Elements

100

Percent composition of oxygen in CO₂

What is 72.7%?

200

Percent composition of nitrogen in NH₃

What is 82.4%?

300

Percent composition of Na in NaNO₂

What is 33.33%?

400

Percent Composition of CO₃ in H₂CO₃

What is 96.75%?

500

Percent Composition of NO₃ in Mg(NO₃)₂

What is 83.53%?

Basic Concepts

100

Law of conservation of mass

Mass cannot be created or destroyed in a chemical reaction, only rearranged.

200

Avogadro's number

6.022 x 10²³ particles per mole.

300

Difference between an atom and a molecule?

Why is an atom is the smallest component of an element whereas a molecule is made up of two or more atoms?

400

Where do we find the Atomic number of an Element? 

We find it in our periodic table aside from the element name atomic symbol, and atomic number

500

Difference between empirical and molecular formulas?

What is the empirical formula gives the lowest whole-number ratio of the elements in the compound, while the molecular formula gives the actual numbers of atoms of each element in the compound? (closest answer wins)

EF/MF conversions

100

Molar Mass of BaI

What is 391.138 g/mol?

200

Molar mass of NO

What is 30.01 g/mol?

300

This is the empirical formula of a molecule with a molecular formula of C₆H₁₂O₆

What is CH₂O?

400

Amount of moles in 7630 grams of MgS

What are 135.34 moles of MgS?

500

The empirical formula of a compound containing 15.8% carbon and 84.2% sulfur

CS₂