Chemistry Semester II

Chemical Reactions

100

Name the Type of Reaction Below:

Na⁺ + Cl^- --> NaCl

Synthesis Reaction

200

Name the Type of Reaction below:

H₂O₂ --> H₂ + O₂

Decomposition

300

Name the Type of Reaction below:

CuO + Zn --> ZnO + Cu

Single Replacement

400

Name the Type of Reaction below:

C₃H₈ + O₂ --> CO₂ + H₂O

Combustion

500

Name the Type of Reaction below:

MgCl₂ + KBr --> KCl + MgBr₂

Double Replacement

Balancing Equations

100

Balance the following chemical equation:

_K + _Cl₂ --> _KCl

2 K + 1 Cl₂ --> 2 KCl

200

Balance the following chemical equation:

_K + _S₂ --> _K₂S

4 K + 1 S₂ --> 2 K₂S

300

Balance the following chemical equation:

_S₂ + _O₂ --> _SO₃

1 S₂ + 3 O₂ --> 2 SO₃

400

Balance the following chemical equation:

_P₆ + _O₂ --> _PO₃

1 P₆ + 9 O₂ --> 6 PO₃

500

Balance the following chemical equation:

_C₃H₈ + _O₂ --> _CO₂ + _H₂O

1 C₃H₈ + 5 O₂ --> 3 CO₂ + 4 H₂O

The Mole

100

How many molecules of NH₃ are in 1 mole of NH₃?

6.02 x 10²³ molecules NH₃ / 1 mole

200

Determine the molar mass of NH₄. You must have the correct units to get the points!

18.05 g/mol NH₄

300

1 N₂ + 3 H₂ --> 2 NH₃

Using the balanced equation above, determine how many moles of NH₃ would be produced if 6 moles of H₂ go into the reaction?

4 moles of NH₃ produced

400

How many moles of H₂ are in 7.9 grams of H₂?

3.91 moles of H₂

500

1 N₂ + 3 H₂ --> 2 NH₃

Using the balanced equation above, determine how many moles of NH₃ would be produced if 0.22 moles of N₂ go into the reaction?

0.44 moles of NH₃ produced

Molarity

100

What are the units for Molarity?

mol/L

200

Determine the Molarity of solution when 0.7 moles HCl are added to 1.5 liters of solution. Must give proper units!

M = n/v

0.47 mol/L

300

Determine the number of moles of solute when the Molarity is 0.55 M and the volume of solution is 3.2 L.

M= n/v

n = 1.76 moles

400

Determine M₂ when:

M₁=0.5 M

V₁=0.7 L

V₂=4.2 L

M₁V₁=M₂V₂

M₂= 0.08 M

500

Determine the Molarity when 30.0 grams of HF go into 2.4 L of solution. Answer must give proper units!

M=n/v

M=0.63 mol/L

Acids/Bases

100

A substance with a pH of 9.2 is a _______.

A substance with a pH of 6.7 is a _______.

pH>7 = Base

pH<7 = Acid

200

The pH of a substance is 4.7. Determine the pOH.

pH + pOH = 14

pOH=9.3

300

Determine the [H⁺] when the pH is 9.2.

pH=-log[H⁺]          [H⁺]=10^-pH

[H⁺]=6.3 x 10^-10 mol/L

400

Determine the type of Acid/Base for the following reactant:

Mg(OH)_2(aq)--> Mg + 2 OH^-

Arrhenius Base

500

Determine the type of acid and base for each of the reactants:

NH₄⁺ + OH^- --> NH₃ + H₂O

NH₄⁺ - Bronsted-Lowry Acid

OH^- - Bronsted-Lowry Base