Stoichiometry Lesson

What is a Excess Reagent?

• amount you end with

• what you run out of first

• what you have left over

• what you start with

What is a Limiting Reagent?

• speeds up a reaction

• what you run out of first

• what you have left over

• slows down a reaction

When does a chemical reaction stop?

• When the lab is finished

• When the excess reactant is used up

• When the limiting reactant is used up

• Chemical reactions never stop

The empirical formula is the formula that includes only the simplest whole

number ratio of elements in a compound

• True

• False

Determine the empirical formula for a compound with the following percent composition: 15.8% carbon and 84.2% sulfur

(molar masses: C = 12.011 g/mol, S = 32.065 g/mol)

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

In the reaction: P₄ + 6Cl₂ ---> 4PCl₃, how many molecules of Phosphorous Chloride are there in the product?

• 1

• 2

• 4

• 12

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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-PS1-7

In the reaction: P₄ + 6Cl₂ ---> 4PCl₃, how many atoms of Chlorine are in the reactant?

• 1

• 2

• 6

• 12

Tags

NGSS.HS-PS1-7