SCH3U
Reference Page
Electronegativities
UNIT 1 TEST
SCH3U
UNIT 1 TEST
Knowledge/Understanding (10)
1. The identity of an element is determined by:
a. protons
b. neutrons
c. electrons
d. all of these
2. Which of the following statements about the periodic table is TRUE?
a. The alkaline earth metals are the most reactive group of elements
b. The majority of elements on the table are metals
c. All non-metals are gases at room temperature
d. The most reactive non-metal is astatine
2+
3. Fill in the table below for the following atom: #$"
!"𝑊 (2 marks)
Element
Number of protons
Number of neutrons
Number of electrons
4. Which periodic trend refers to the ability of an atom to attract electrons from other atoms?
a. ionization energy
c. electron affinity
b. metallic character
d. electronegativity
5. Placed the elements N, O, As, Se in order from least to greatest atomic radius.
a. N < O < As < Se
b. N < As < O < Se
c. O < N < Se < As
d. O < N < As < Se
6. Of the options below, which bond would be the least polar?
a. Na-N
b. Si-S
c. P-Cl
d. N-Br
7. Which of these chemical bonds is impossible?
a. C-P
b. Na-Al
d. Ca-F
c. Cl-Br
8. Based on the Law of Conservation of Mass, which of the following statements is true when balancing
equations?
a. There must be an equal number of each type of atom on the reactant side and the product side
b. Atoms cannot form new compounds
c. There must be an equal number of molecules on both the reactant side and the product side
d. There must be an equal number of total atoms on the reactant side and product side, but the
number of individual atoms doesn’t matter
9. Which type of reaction follows the general form AX + BY à AY + BX?
a. Synthesis
c. Single displacement
b. Decomposition
d. Double displacement
e. Combustion
10. Which of the following metals would react with a solution of lithium nitrate?
a. calcium
d. sodium
b. zinc
e. none of these
c. magnesium
SCH3U
UNIT 1 TEST
Communication (17)
11. Complete the following table. On the left side, write the formula that corresponds with the given
compound name. On the right side, write the name that corresponds with the given compound formula
(10).
Compound Name
Compound
Formula
dinitrogen tetroxide
Compound
Formula
NH4Cl
rubidium phosphite
CuCN
lead (IV) carbonate
IO2
sulfurous acid
NiSO4Ÿ6H2O
strontium perchlorate
Mn(CrO4)3
Compound Name
12. Why do elements form bonds? (3)
13. Below, the ionic radii of several ions are shown relative to the radius of neutral atoms of the same
element.
Explain why the ions in the diagram on the left are smaller than their neutral counterparts, while the
ions in the diagram on the right are larger than their neutral counterparts. (4)
SCH3U
UNIT 1 TEST
Application (19)
14. Copper has two isotopes, Cu-63 and Cu-65. The average atomic mass of copper is 64.928 g/mol. What
is the percent abundance of each isotope? (3)
15. Balance the following chemical equations, and identify the reaction type of each (8):
Balanced equation:
Reaction type:
____ HgO + ____ F2 → ____ HgF2 + ___ O2
____ KOH + ____ MgCl2 → ____ KCl + ____ Mg(OH)2
____ H3PO4 + ____ Fe(OH)2 → ____ H2O + ____ Fe3(PO4)2
_____ NaClO3 → _____ NaCl + _____ O2
16. While a majority of molecules follow the octet rule, there are a number of exceptions. Show Lewis
diagrams for each of the following molecules, then identify which compounds violate the octet rule (8):
a. phosphorus pentachloride
c. selenium dioxide
b. chloroform (CH3Cl)
d. ethylene (C2H4)
SCH3U
UNIT 1 TEST
Thinking/Inquiry (8)
17. Given the reactants for each situation below, predict the products of the reaction and write a balanced
chemical equation. If you predict that no reaction will occur, write the formula of the reactants, then
NR. (2x4)
a. Rainwater falling on an iron nail exposes it to carbonic acid
b. Hydrogen and oxygen gases react under heat and pressure in the engine of a hydrogen-powered
car