Chemical Reactions and Stoichiometry

Balance Chemical Reactions

100

How many Hydrogen are in 4H₂O?

8

200

Definition: Matter cannot be gained or lost in a chemical reaction.

Law of Conservation of Mass

300

Definition: The large number in front of a chemical formula.

coefficient

400

What are the coefficients to balance the chemical equation?
_Fe + _O₂ -> _Fe₂O₃

4, 3, 2

500

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

2, 6, 3, 2

Classify Chemical Reactions

100

What type of chemical reaction is this?

2Na + Br₂ --> 2NaBr

combination/synthesis

200

What type of chemical reaction is this?
Al(OH)₃ → Al₂O₃  + H₂O

decomposition

300

The following is what type of reaction:
PbCl₂ + AgNO₃ → Pb(NO₃)₂ + AgCl

double replacement/displacement

400

What type of chemical reaction is this? 

C₄H₁₂ + 5O₂ → 2CO₂ + 6H₂O

combustion

500

What are the two products of any neutralization reaction?

water and some sort of salt

Mole Conversions and Ratios

100

What is Avogradro's number?

6.022 x 10²³

200

How do you find the molar mass?

periodic table; use atomic weight/mass

300

Mole ratios between substances of the same chemical reaction stem from the

coefficients of the balanced equation

400

@STP 1 mole is the same as what volume of gas? Use correct units.

22.4 L

500

What is the molar mass of lead (II) nitrate or Pb(NO₃)₂? Use correct units. 

331.2 g/mol

Stoichiometry Calculations

100

Using the balanced equation:

Mg + 2HCl --> MgCl₂ + H₂

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂? Use correct units.

15 mol HCl

200

What is the volume of 2 moles of helium gas (He₂)? Use correct units.

44.8 L

300

How many moles are 2.85 x 10²⁰ atoms of iron? Use correct units.

0.00473 or 4.73 x 10^-4 moles

400

2CO  +  O₂  −-> 2CO₂
How many liters of carbon dioxide are produced from 10L of carbon monoxide? Use correct units.

10 L CO₂

500

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum? Use correct units.

290 g Al₂(SO₄)₂

Limiting and Excess Reactants

100

the reactant that determines how much product can be made

limiting reactant

200

1 Cheese + 2 Bread --> 1 grilled cheese

How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

13 grilled cheese

300

1 Body + 4 Tires --> 1 car
How many cars can you make with 92 tires and 34 bodies?

23

400

What is the excess reactant if 10 moles of NH₃ react with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

NO

500

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12O₂ --> 10CO₂ + 4H₂O

O₂ or oxygen