Practice CFA - Stoichiometry

What is the purpose of stoichiometry in chemistry?

• To find the amount of product in a reaction

• To measure the size of a molecule precisely

• To identify the type of bonds in a compound

• To change the phase of a substance carefully

Which concept is newly introduced in stoichiometry calculations?

• The relationship of mass to volume

• The balanced equation’s reaction time

• The mole to mole ratio between substances

• The way energy transfers in reactions

Where do the coefficients for mole to mole ratios come from?

• The periodic table’s atomic structure

• The balanced chemical equation

• The molecular structure of substances

• The experimental yield of the reaction

How does the mole-to-mole ratio help in calculations?

• By determining the type of chemical bonds

• By converting between two different substances

• By finding the melting point of elements

• By showing the reactivity of a compound

Which of the following correctly represents the setup of a mole ratio?

• Numerator is Substance A, denominator is Substance B

• Denominator is the total mass, numerator is a reactant

• Numerator is Substance B, denominator is Substance A

• Denominator is the limiting reactant, numerator is excess

What is the first step in solving a stoichiometry problem?

• Identify what is given and what to find

• Write the final numerical answer first

• Convert all masses into volume units

• Add coefficients randomly to balance

What does the stoichiometry map help determine?

• The exact time needed for a reaction

• The path needed for conversions

• The color change during a reaction

• The new bonds formed between atoms

When setting up conversion factors, how should they be arranged?

• Following the path from left to right

• Placing the larger number on top

• Using random values for easy math

• Arranging based on the final product