Semester Review #5: Stoichiometry

Front

What is the correct Lewis structure for the compound PBr3?

Back

Structure D

Front

In the equation 2Al2O3 → 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

Back

4:3

Front

What are the units used to measure temperature?

Back

K (Kelvin), F (Fahrenheit), C (Celsius)

Front

What type of bond is formed when three pairs of electrons are shared?

Back

Triple bond

Front

If 146.07 grams of Cl2 reacts, how many grams of P4 will also react in the reaction P4 + _ Cl2 → _ PCl5?

Back

25.523 g P4

Front

Define stoichiometry.

Back

The calculation of reactants and products in chemical reactions.

Front

What is the mole concept in chemistry?

Back

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

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

They represent the mole ratio of reactants and products.

Front

How do you convert grams to moles?

Back

Use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of Cl2?

Back

The molar mass of Cl2 is approximately 70.90 g/mol.