Stoichiometry Bellwork 2

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

What is the mole concept?

Back

The mole is a unit of measurement in chemistry that represents 6.022 x 10²³ particles (atoms, molecules, etc.). It allows chemists to count quantities of substances.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol). Formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the balanced equation for the reaction of aluminum oxide decomposition?

Back

2Al2O3 -> 4Al + 3O2.

Front

How do you determine the molar mass of a compound?

Back

To find the molar mass, sum the atomic masses of all atoms in the compound's formula. For example, Al2O3: (2 x 26.98) + (3 x 16.00) = 101.96 g/mol.

Front

What is the significance of STP in gas calculations?

Back

STP (Standard Temperature and Pressure) is defined as 0°C (273.15 K) and 1 atm pressure. At STP, 1 mole of an ideal gas occupies 22.4 liters.

Front

How do you calculate the number of moles from volume at STP?

Back

At STP, to find moles from volume, use the formula: Moles = Volume (L) / 22.4 L/mol.

Front

What is the relationship between moles and molecules?

Back

1 mole of any substance contains 6.022 x 10²³ molecules, known as Avogadro's number.

Front

How do you find the mass of a product in a chemical reaction?

Back

To find the mass of a product, first calculate the moles of the product using stoichiometry, then convert moles to grams using the molar mass.

Front

What is a limiting reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product formed.