Name:______

SCH 3U Unit #1 Test

Aids Permitted: ALCHEM Periodic Table of Elements and Ions, calculator

Part A – Knowledge and Understanding [20 marks]

1)a. Explain how you would find the number of Protons, Neutrons and Electrons for an atom of Boron. [3]

b. Draw:

i. A Bohr diagram of an atom of Boron [1]ii. A Lewis diagram of the Boron ion [1]

2)Use the table below to compare and contrast ionic and covalent bonds. [3]

Ionic Bonds / Covalent Bonds
Differences / Differences
Similarities

3)The rows and columns of the Periodic Table of Elements are used to organize elements based on a variety of atomic characteristics, properties and trends. List any 4 of these characteristics, properties or trends and briefly explain how they behave in the rows of the periodic table. [4]

4)A compound can be identified as either ionic or covalent by testing the physical properties of the compound. Complete the table below to select a property that could help identify the type of compound and the result you would expect to see. [4]

Type of Compound / Property / Result
Ionic
Covalent

5)Choose two of the intermolecular forces of attraction discussed in class and describe how/why they occur. (Feel free to use examples in your description). [4]

Intermolecular Force / Description/Example

Part B – Application [35 marks]

Answer the following questions in the space provided.

  1. Describe in detail, using Lewis diagrams, how/why the bonding between the elements in Al2O3 and N2O3 are different. [3]
  1. Explain why we use roman numerals in some chemical names and not others. Make sure that you use a specific example to help illustrate when roman numerals are necessary to represent a chemical. [2]
  1. Provide the chemical formula for each of the following compounds. [10]

a)Aluminum Sulfite______

b)Copper (II) Chloride Pentahydrate______

c)Carbon Tetrahydride______

d)Hydrochloric Acid______

e)Calcium Sulfide______

f)Lead (II) Dichromate______

g)Hypochlorous Acid______

h)Silver Hyponitrite______

i)Periodic Acid______

j)Dinitrogen Trioxide______

  1. Provide the IUPAC name for each of the following compounds. [10]

a)SrCl2 3H2O______

b)Fe(NO2)2______

c)H2SO3______

d)Pb3(BO2)2______

e)NH3______

f)HF______

g)(NH4)2CO4______

h)HNO4______

i)Si2Cl6______

j)HNO______

  1. i.Draw the Lewis Structure for each molecule given. [4]

a) NCl3b) C2F2

ii.Use electronegativity values to determine if the bonds in the above molecules are ionic, polar covalent or pure covalent [3]

a)b)

  1. Chromium is found in small quantities in the environment throughout Canada. This element occurs naturally as four different isotopes, as shown in the table below.

Isotope (amu) / Abundance (%)
Cr-50 / 4.35
Cr-53 / 9.50
Cr-54 / 2.36
? / 83.79

If the average atomic mass of chromium is 52.0552, what is the mass of the fourth isotope? [3]