CHE11 Exam Review Practice

Chemical Reactions

100

These are the products of complete combustion

What are CO₂ and H₂O

200

A metal carbonate (such as Na₂CO₃) decomposes into these two products

metal oxide and carbon dioxide gas

300

This is the precipitate in this reaction

MgCl₂ + NaOH -> ?

Mg(OH)₂

bonus question:

1) What is this type of reaction called?

400

CuCl₂ solution and an unknown metal create a brown precipitate when combined.  These are three possible identities of these metals

Answers Vary

500

This is the full balanced chemical equation for the reaction of potassium fluoride reacting with calcium carbonate.

2KF + CaCO₃ --> K₂CO₃ + CaF₂

Bonus: Does this reaction occur?

Stoichiometry

100

This is the molar ratio of water to acid in this reaction:

2H₃PO₄ + 3Ba(OH)₂ --> 3H₂O + Ba₃(PO₄)₂

What is 3 to 2 (3:2)

200

If you have one mole of hydrogen gas and one mole of nitrogen gas to for ammonia, this is the limiting reactant?

3H₂ + N₂ --> 2NH₃

What is Hydrogen Gas

300

Four moles of Iron Hydroxide decomposes into iron oxide and water (see below).  This is the mass of water that is produced.

2Fe(OH)₃ --> Fe₂O₃ + 3H₂O

What is 108g of water.

400

3L of Br₂ reacts with excess hydrogen gas to produce HBr at STP.  This is the mass of HBr that is produced.

Br₂ + H₂ --> 2HBr

What is 21.67g of HBr

500

100g of silver is placed in 100mL of 2M nitric acid.  What concentration of silver nitrate is produced?

2Ag + 2HNO₃ --> 2AgNO₃ + H₂

What is 9.27M

Trends and Patterns

100

Of the following it has the largest atomic radius:

Sodium, Fluorine, Barium, Oxygen

What is Barium

200

For an ideal gas, as pressure increases, temperature ______ (assuming volume is kept constant)

Increases 

300

If an acid dissociates its proton (H) close to 100%, we call it this.

A Strong Acid

400

Name two metals that would react in acid but not in water

Answers will vary

500

What intermolecular forces would you expect in a beaker of H-Br molecules? (must get all of them)

-London Dispersion
-Hydrogen Bonding
-Dipole-Dipole

Calculations

100

You add 5L of juice concentrate to 20L of water.  What is the (V/V%) of the resulting drink?

20% (5/25 not 5/20)

200

You collect the following data:

Watchglass 5g
Product + Watchglass  23g
Theoretical Product produced 25g

What is your Percent Yield?

What is 72%

300

5 moles of an unknown chemical has a mass of 919.2g.  What is the identity of this element?

What is Tungsten (W)

400

The empirical formula of a compound is CH₂O.  If the molar mass of the actual molecule is 180.2g/mol, what is the formula of the compound?

C₆H₁₂O₆ (sugar!)

500

A common diatomic gas at 20^OC takes up a volume 3L at 200KPa.  If the gas has a mass of 7.88g.  Predict the identity of the gas.

Oxygen gas

Mr. Alex

100

(no lost money for incorrect guesses)

This is Mr. Alex's favourite colour

What is green

200

(no lost money for incorrect guesses)

If Mr. Alex went to an amusement park, he would line up first for...
a) The ferris wheel
b) The scariest roller coaster
c) The ride that spins the fastest
d) The water park slides
e) The park bench (I hate rides)

b) The scariest roller coaster

300

(no lost money for incorrect guesses)

Mr. Alex's favourite type of movie is:
a) Action/Adventure
b) Comedy
c) Horror
d) Science Fiction
e) Romantic Comedy

c) Horror

400

This was Mr. Alex's job before becoming a teacher:
a) Accountant (works with money)
b) Veterinarian (doctor for animals)
c) Paramedic (Ambulance Medical)
d) Programmer (Computer Coding)
e) Chef (Cooking)

C) Paramedic

500

What is Mr. Alex's favourite TV Show (it was mentioned in class during one of the Units)

The Mole