Stoichiometry Lab

What is a Limiting Reagent?

• speeds up a reaction

• what you run out of first

• what you have left over

• slows down a reaction

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

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

2H₂ + O₂ --> 2H₂O

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

What is the limiting reactant?

• Hydrogen

• Oxygen

• Water

• There is not a limiting reactant

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a Excess Reagent?

• amount you end with

• what you run out of first

• what you have left over

• what you start with

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

number ratio of elements in a compound

• True

• False

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

Tags

NGSS.HS-PS1-7

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2

• 4

• 6

• 8

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7