SCH3U Exam Review

Unit 1: Chemical Bonding

100

How many electrons are in a sulfide ion?

18

200

What is the chemical formula of a compound that contains an element, X, in group 2 and element Y, in group 17?

XY₂

300

Write the chemical name for:  Pd(ClO₄)₂.

Palladium(II) perchlorate

400

Determine if the molecule TeCl₂ is polar or non-polar.

Polar

500

Rank the following from lowest to highest boiling point: TeF₂, HF, SiO₂

SiO₂ < TeF₂ < HF

Unit 2: Reactions

100

Balance this equation: KCl --> K + Cl2

2KCl --> 2K + Cl2

200

What type of reaction is the following: Br₂ + KI -> KBr + I₂?

Single Displacement

300

Write a chemical reaction for the production of a metal oxide, where the metal is Lithium

Li + O₂ -> Li₂O

400

Predict the products (chemical formula) for the reaction between: sulfuric acid and aluminium hydroxide.

H₂O and Al₂(SO₄)₃

500

Write the chemical formula for the precipitate formed when lead (II) nitrate reacts with hydrosulfuric acid.

PbS

Unit 3: Moles

100

What is the molar mass of NH₃?

17.04 g/mol

200

How many oxygen atoms are present in 8.5 g of magnesium nitrate?

2.1 x 10²³ O atoms

300

0.987 mol of potassium chlorate decompose into potassium chloride and oxygen. Calculate the moles of potassium chloride and oxygen that are formed.

1.48 mol of O2 and 0.987 mol of KCl

400

You perform a double displacement reaction with 15 grams of copper (II) chloride and 20 grams of sodium nitrate. What is the theoretical yield (in grams) of sodium chloride?

13 g

500

What mass of the excess reagent remains in a reaction with 6.71 g of Aluminium and 12.95 g of sulfuric acid?

4.34 g

Unit 4: Solution

100

What are the unit for molarity?

M or mol/L

200

Calculate the mass of sodium carbonate required to prepare 0.450 L of a 0.89 M solution.

42 g

300

Use a solubility chart (from your notes) for this question:

At 20°C, 50 g of potassium chloride is added to 100 mL of water. What would you have to do to make the solution saturated?

Heat up solution to 80 degrees

400

Aqueous sodium sulfide reacts with aqueous iron (II) sulfate. Determine the spectator ions in this reaction.

Na⁺ and SO₄^2-

500

An excess of silver nitrate solution is added to 65 mL of a 2.5 M solution of calcium chloride. Calculate the mass of precipitate that is formed in the reaction.         

47 g

Unit 5: Gases

100

What is the Ideal Gas Law?

PV = nRT

200

What are the Temp (in K) and P (in kPa) at STP?

T = 273 K and P = 101.325 kPa

300

What is the value of the molar volume at SATP?

24.8 L

400

What volume of carbon dioxide is produced in a complete combustion with 6.40 g of methane gas? All gases at 35°C and 100.0 kPa.

10. g

500

A sample of gas has a mass of 7.60 g and occupies a volume of 2.45 L at STP. What is the molar mass of this gas?

69.5 g/mol