Defining Stoichiometry

Knowing the mole ratio of a reactant and product in a chemical reaction would allow you to determine:

• the energy released in the reaction.

• the speed of the reaction.

• whether the reaction is reversible.

• the mass of the product produced from a known mass of reactant.

Tags

NGSS.HS-PS1-7

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

• Write a Balanced Equation

• Write an Unbalanced Equation

• Panic

• Avogadro's Number

2H₂ + O₂ --> 2H₂O

12 grams of H₂ are reacted with 36 grams of O₂.

Calculate the amount of excess reactant.

• 4.5 grams

• 7.5 grams

• 12.5 grams

• 36.5 grams

Tags

NGSS.HS-PS1-7

The calculation of the relationships between different molecules in a reaction is the definition of __________________.

• physics

• algebra

• stoichiometry

• language arts

Tags

NGSS.HS-PS1-7

The blue numbers in the image below represent ________

• I don't know, and don't want to try

• coefficients

• subscripts

• none of the answers are correct

A mole of any substance is how many particles?

• 6.02 x 10²³

• 6.02 x 10^-23

• 602 million

• 602

Tags

NGSS.HS-PS1-7

Before you begin any stoichiometry problem, you must always start with this.

• A periodic table.

• A calculator.

• A balanced chemical equation.

• All of the above are helpful.

Tags

NGSS.HS-PS1-1

What is stoichiometry primarily concerned with in chemical reactions?

• The energy changes in reactions

• The speed of reactions

• The quantitative relationships between reactants and products

• The color changes in reactions

Tags

NGSS.HS-PS1-7

In stoichiometry, what is the significance of a balanced chemical equation?

• It shows the speed of the reaction

• It provides the mole ratio of reactants and products

• It indicates the color change

• It determines the temperature change

Tags

NGSS.HS-PS1-7

Which of the following is a necessary step in solving a stoichiometry problem?

• Measuring the temperature

• Writing a balanced chemical equation

• Determining the color of the reactants

• Calculating the speed of the reaction