Chapter 12 Stoichiometry

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

Tags

NGSS.HS-PS1-7

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)

2H₂ + O₂ --> 2H₂O

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

What is the excess reactant?

• Hydrogen

• Oxygen

• Water

• There is no excess reactant

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-PS1-5