HN Midterm Review #3

Front

What is the number of neutrons in an atom?

Back

The number of neutrons is calculated by subtracting the atomic number (number of protons) from the mass number of the atom.

Front

What is the theoretical yield in a chemical reaction?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

How do you determine the limiting reactant in a chemical reaction?

Back

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

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is CH4 + 2O2 → CO2 + 2H2O.

Front

How do you calculate the mass of a reactant needed for a reaction?

Back

To calculate the mass of a reactant needed, use the molar mass and stoichiometry of the balanced equation.

Front

What is the molar mass of CH4 (methane)?

Back

The molar mass of CH4 is approximately 16.04 g/mol.

Front

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

Back

Coefficients indicate the relative number of moles of each reactant and product involved in the reaction.

Front

How do you convert grams of a substance to moles?

Back

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

Front

What is the formula for calculating the theoretical yield of a product?

Back

The theoretical yield can be calculated using the formula: (moles of limiting reactant) x (molar mass of product).

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen acts as an oxidizing agent, reacting with the fuel to produce energy, carbon dioxide, and water.