Review on Stoichiometry

What does the coefficient in front of reactants and products represent in balanced equations?

• number of moles

• type of reaction

• position on the periodic table

• number of compounds

is defined as the relationship between reactants and products in a chemical reaction is called what?

• mole ratio

• stoichiometry

• molar mass

• chemical equation

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation

• Panic

• Write an Unbalanced Equation

• Ask for help

True or False. You must convert grams to moles using molar mass to do stoichiometry.

• True

• False

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg/ 3 mol Fe

• 1 mol Fe/ 2 mol Fe

• 3 mol MgO / 2 mol Fe

In the reaction 2 H₂ + O₂ → 2 H₂O what is the mole ratio of oxygen to water

• 1/2

• 2/1

• 3/4

• 4/3

Tags

NGSS.MS-PS1-5

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

• 10/6

• 3/4

• 4/3

• 2/3

Tags

NGSS.HS-PS1-7

In a chemical reaction, the mass of reactants ___.

• is less than the mass of products

• is greater than the mass of products

• has no relationship to the mass of products

• is equal to the mass of products

Tags

NGSS.HS-PS1-7

the conversion factor used to convert from mass to mole or mole to mass is

• mole ratio

• molar mass

• mass number

• none of these

Which of the following is NOT a type of stoichiometric conversion?

• mole to mole

• mole to mass

• mass to molecule

• mass to mass