Week 1 Balancing, Oxid, Polarity, etc.
Authored by Robert Morales
Chemistry
11th Grade
NGSS covered
Used 2+ times
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the oxidation number of the chlorine atoms in Cl2?
2
17
35.45
-1
0
Answer explanation
Elements in their atomic state have an oxidation number of 0 (Cl is one of the seven diatomic elements). Additionally, there is no other value for each of the chlorine atoms that could add up to 0.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rank these single bonds from least polar to most polar:
C-O, H-F, P-S, Br-Br.
H-F < C-O < P-S < Br-Br
H-F < P-S < C-O < Br-Br
Br-Br < H-F < P-S < C-O
Br-Br < C-O < P-S < H-F
Br-Br < P-S < C-O < H-F
Answer explanation
H = 2.1
F = 4.0
O = 3.5
N = 3.0
C = 2.5
B = 2.0
Cl = 3.16
S = 2.58
P = 2.19
Br = 3.0
I = 2.66
Tags
NGSS.HS-PS1-3
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When this equation is balanced, what is the sum of the coefficients?
Au3+(aq) + I‒(aq) → Au(s) + I2(s)
5
2
13
9
7
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Arrange these compounds in order of increasing melting point:
BaS, KCl, LiF, NaCl, CaO
CaO < BaS < LiF < KCl < NaCl
NaCl < KCl < LiF < BaS < CaO
LiF < NaCl < KCl < CaO < BaS
BaS < CaO < KCl < NaCl < LiF
KCl < NaCl < LiF < BaS < CaO
Answer explanation
First, consider the charge (larger is stronger attraction), and then consider the size (smaller is stronger attraction).
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the sum of the coefficients in the balanced redox reaction when Au3+ and I– react in solution to form elemental products?
5
6
8
9
13
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which of these species is the sulfur atom in the highest oxidation state?
H2S
SO42-
S2-
SO2
SF6
Answer explanation
Draw Lewis structures, give electrons to the most electronegative atom.
Valence electrons - # of electrons owned = oxidation number
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When the following equation is balanced using the smallest whole number coefficients, what is the sum of the coefficients?
H3PO4 (aq) + Ba(OH)2(s) → Ba3(PO4)2(s) + H2O(ℓ)
8
10
12
14
16
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