WorksheetsC-2 Unit Pre-Test
Total questions: 50
Worksheet time: 38mins
Name
Class
Date
1.
How do covalent bonds form?
a)
Donating & receiving valence e- between atoms.
b)
Opposite slight charges attract each other between compounds.
c)
Scientists are still not sure how they form.
d)
Sharing valence e- between atoms.
2.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
3.
What is a valence electron?
a)
The sum of neutrons and protons.
b)
The # of electrons in the last shell.
c)
A type of bond.
d)
A popular compound.
4.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
5.
Where are metals located on the periodic table?
a)
Blue
b)
Green
c)
Red
6.
Where are the nonmetals located on the periodic table?
a)
Blue
b)
Red
c)
Green
7.
An electron has what kind of charge?
a)
no charge
b)
positive
c)
negative
d)
it depends
8.
a proton has what charge?
a)
positive
b)
negative
c)
no charge
d)
it depends
9.
Atoms that gain electrons become...
a)
negatively charged
b)
positively charged
c)
remain neutrally charged
d)
21
10.
What happens when an atom loses an electron?
a)
It becomes Negatively Charged
b)
It remains neutral because the proton also leaves.
c)
It becomes Positively Charged
d)
It stays the same.
11.
Which is the charge that results when oxygen becomes an ion?
a)
+3
b)
+2
c)
-2
d)
-3
12.
Ionic bonding always takes place between
a)
ions of opposite electrical charge
b)
ions of the same electrical charge
c)
ions of the same size
d)
ions of the same size and opposite charge
13.
if METALS are more likely to LOSE electrons, they will form ...
a)
anions
b)
neutral atoms
c)
cations
d)
negative ions
14.
If an aluminum atom has 13 protons (+) and 10 electrons (-), what is it's charge?
a)
Al3+
b)
Al13+
c)
Al10+
d)
Al10-
15.
What is correct formula for - Lithium Iodide
a)
LiI
b)
Li2I
c)
LiI2
d)
Li3I
16.
How many Aluminum atoms are in Al2O3?
a)
3
b)
2
c)
5
d)
1
17.
An atom with 3 valence electrons "wants" a full shell, so it can either gain 5 or lose 3. Which is more likely to occur?
a)
Gain 5
b)
Lose 3
c)
Nothing
18.
This type of model shows only the valence electrons of an element?
a)
Bohr diagram
b)
Childers model
c)
Lewis-dot diagram
d)
What is a valence electron again?
19.
a)
The number circled is called a subscript.
b)
The number circled is called a superscript.
c)
The number shows that the element is a coefficient.
20.
Why don't noble gases normally form chemical bonds?
a)
They have only 2 valence electrons
b)
Their outer level electrons are empty
c)
They have 8 neutrons
d)
They have a full valence electron shell
21.
Combining substances to form a new substance
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
22.
Breaking down a substance into simpler substances
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
23.
What type of reaction is the equation C + O2 → CO2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
24.
What type of reaction is the equation 2NaCl →2Na +Cl2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
25.
Cu + 2Ag(NO3) → 2Ag + Cu(NO3)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
26.
Ca3(PO4)2 + 3 H2SO4 + 3 CaSO4 + 2 H3(PO4)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
27.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
28.
Which of the following is an example of a physical change to matter?
a)
rusting
b)
digestion
c)
freezing
29.
Which generalized equation represents a synthesis reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
30.
Which generalized equation represents a decomposition reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
31.
Which generalized equation represents a single displacement reaction?
a)
A + BC → AC+ B
b)
A + B → AB
c)
AB → A + B
32.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, rearranged
d)
None of the above
33.
If a reaction starts with a total 75g of reactants it should produce
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
34.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
35.
In a synthesis reaction one reactant has a masss of 6g and the second reactant has 12g. How much mass should the product of this reaction have?
a)
18g
b)
12g
c)
6g
d)
None of the above
36.
Low melting point and low solubility in water are general properties of ______________________ compounds
a)
ionic
b)
covalent
c)
chemical
d)
glucose
37.
LiBr is called
a)
lithium bromine
b)
lithium (I) bromine
c)
lithium bromide
d)
lithuim (I) bromide
38.
How do the following two elements bond together?
Na1+ F1-
Na1+ F1-
a)
NaF
b)
NaF3
c)
Na3F
d)
Na1F2
39.
How do the following two elements bond together?
Cr3+ O2-
Cr3+ O2-
a)
CrO
b)
Cr3O2
c)
Cr2O3
d)
CrO3
40.
How do the following two elements bond together?
Al3+ O2-
Al3+ O2-
a)
AlO
b)
Al2O3
c)
Al3O6
d)
Al3O2
41.
AgF
a)
silver fluoride
b)
silver fluorine
c)
monosilver monofluoride
d)
silver monofluorine
42.
The chemical formula for an ionic compound of potassium and oxygen is
a)
KO.
b)
K2O.
c)
K2O2.
d)
KO2.
43.
The first step in naming an ionic compound is always...
a)
Naming the anion
b)
Changing the ending to -ide
c)
Naming the cation
d)
Writing the cation charge
44.
What is the charge on the simple (single atom) ion that sulfur forms?
a)
1-
b)
2+
c)
3+
d)
2-
45.
Which of the following is a property of an ionic compound?
a)
high melting point
b)
soft
c)
malleable
d)
liquid at room temperature
46.
In what form can an ionic compound conduct electricity?
a)
when dissolved in water
b)
as a solid
c)
as a crystal
d)
when warmed slightly
47.
Ionic bonds could be best described as:
a)
A bond formed when 2 atoms share electrons
b)
A firm handshake
c)
An electrostatic attraction between oppositely charged ions
d)
An electrostatic attraction between anions
48.
The properties listed are describing...
Exists as solid, liquids, and gases
Bad conductors
Low melting and boiling points
Flammable and brittle
a)
Ionic bonds
b)
Covalent bonds
49.
Which of the following is NOT TRUE about covalent compounds?
a)
They have low melting and boiling points.
b)
They are formed from 2 nonmetals.
c)
They can conduct electricity when dissolved in water (aqueous).
50.
Which set of elements is most likely to form an ionic compound?
a)
Na and O
b)
C and O
c)
Na and K
100 %
