Semester Review #5: Stoichiometry

Front

What is the Lewis Dot Structure for ammonia (NH3)?

Back

The Lewis Dot Structure for ammonia (NH3) shows nitrogen (N) in the center with three hydrogen (H) atoms bonded to it, and a lone pair of electrons on the nitrogen.

Front

If 284.38 grams of AlCl3 are reacted, how many grams of Al will be produced?

Back

57.463 g Al (using the stoichiometric ratio from the balanced equation 2 AlCl3 → 2 Al + 3 Cl2).

Front

How many electrons does each line in a Lewis structure indicate are shared?

Back

Each line indicates 2 electrons are shared.

Front

How many steps will it take to go from moles given to moles unknown in stoichiometry?

Back

1 step, if using a direct mole ratio from a balanced equation.

Front

What is the correct structure for BF3?

Back

The correct structure for BF3 has boron (B) in the center with three fluorine (F) atoms bonded to it.

Front

Define stoichiometry.

Back

Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

What is the purpose of a balanced chemical equation?

Back

A balanced chemical equation ensures that the number of atoms for each element is conserved in a chemical reaction.

Front

What is the molar mass of AlCl3?

Back

The molar mass of AlCl3 is approximately 133.33 g/mol (Al: 26.98 g/mol + 3 Cl: 35.45 g/mol each).

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.