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Chemistry: Unit 3 Test Review Flashcards | StudBud
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Chemistry: Unit 3 Test Review
Chemistry: Unit 3 Test Review
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Answers
1
What is the difference between an atom vs. an ion?
The terms are interchangeable
An ion has a charge
An ion is neutral
An atom has a charge
2
When is the Unit 3 Test for chemistry?
After break
I don't know
Tomorrow. I will study tonight.
Today
3
What property makes water a universal solvent (dissolves things well)?
Water is a liquid
Water has oxygen
What has 3 atoms
Water is polar
4
Which soccer player scored the winning goal of the 1986 World Cup with his hand?
Socrates
Rossi
Maradona
Ronaldo
5
The Law of Conservation of Mass states:
The type of atoms going into a reaction will change identity
The number of atoms must equal the number of atoms coming out of a reaction
The form of atoms will change shape in a chemical reaction
All of the above
6
Explain why chlorine has a higher electronegativity than bromine.
Chlorine and bromine has the same electronegativity
Bromine has fewer protons
Chlorine has a smaller atomic radius than bromine
Chlorine has fewer electrons
7
Look at the periodic table. Which elements will have the most similar properties?
Boron and Hydrogen
Silicon and Neon
Helium and Lithium
Fluorine and Bromine
8
A positive Mg
+
ion will attract to what type of charge?
Negative
Positive
Neutral
9
What is the charge of the following polyatomic ion? (Compare the number of expected ve
-
compared to the observable ve
-
)
no charge
-1
-2
+1
10
As the electronegativity difference (ΔEN) increases, the polarity of a molecule ______________________.
Increases
Stays the same
Decreases
11
How many valence electrons does an Arsenic (As) atom have?
3
6
5
1
12
Where will the valence electrons be located in a
nonpolar covalent
bond?
All of the above
Electrons are not shared but completely transferred
Equally in the middle of the atoms
Closer to one atom
13
How many SO
4
molecules are present in the products of this reaction?
3
1
4
2
14
Which bond character is the strongest?
Polar covalent
Ionic
All bonds are equally strong
Nonpolar covalent
15
What is type of bond is present in a LiO molecule?
Use the electronegativity periodic table.
Ionic
Nonpolar covalent
It differs for each bond
Polar covalent
