Stoichiometry

How many steps are needed to convert grams to grams?

• 1 step

• 2 steps

• 3 steps

• 4 steps

What is the first step in stoichiometric calculations?

• To measure the mass of the reactants

• To write a balanced chemical equation for the reaction

• To calculate the moles of products

• To determine the temperature of the reaction

How many steps are needed to convert moles given to moles unknown?

• 1 step using mole ratios

• 2 steps using mole ratios

• 3 steps using mole ratios

• 4 steps using mole ratios

What is the relationship between moles and volume at STP?

• At STP, 1 mole of any gas occupies 22.4 liters.

• At STP, 1 mole of any gas occupies 10 liters.

• At STP, 1 mole of any gas occupies 5 liters.

• At STP, 1 mole of any gas occupies 30 liters.

What are mole ratios?

• The ratios of moles of one substance to moles of another substance in a balanced chemical equation.

• The total number of moles in a chemical reaction.

• The ratio of mass to volume in a solution.

• The number of molecules in a mole of a substance.

What is the significance of coefficients in a balanced equation?

• Coefficients indicate the number of moles of each substance involved in the reaction.

• Coefficients represent the temperature at which the reaction occurs.

• Coefficients show the pressure conditions required for the reaction.

• Coefficients determine the color change during the reaction.

Tags

NGSS.HS-PS1-7

What is a balanced chemical equation?

• A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, representing the conservation of mass.

• A balanced chemical equation shows the total mass of reactants is greater than the products.

• A balanced chemical equation indicates that reactions can occur in any direction without constraints.

• A balanced chemical equation is one that includes only solid reactants and products.

Tags

NGSS.HS-PS1-7

Where are mole ratios obtained from?

• From the unbalanced chemical equation.

• From experimental data in the lab.

• From the balanced chemical equation.

• From theoretical calculations only.

How do you balance a chemical reaction?

• By changing the chemical formulas of the reactants and products.

• By adjusting the coefficients in front of the reactants and products to ensure the same number of each type of atom on both sides.

• By adding more reactants until the products equal the reactants.

• By using a calculator to determine the correct amounts of each substance.

What is the difference between empirical and molecular formulas?

• The empirical formula shows the actual number of atoms of each element in a molecule, while the molecular formula shows the simplest whole-number ratio of atoms in a compound.

• The empirical formula shows the simplest whole-number ratio of atoms in a compound, while the molecular formula shows the actual number of atoms of each element in a molecule.

• The empirical formula is used only for ionic compounds, while the molecular formula is used for covalent compounds.

• The empirical formula represents the average mass of a compound, while the molecular formula represents the total mass of all atoms in a molecule.