WorksheetsChemistry Eoc Exam
Total questions: 28
Worksheet time: 39mins
Name
Class
Date
1.
If the pH of a substance is 5 then then substance may have been contaminated by a
a)
Acid
b)
Base
c)
neutral substance
2.
In a chemical reaction between an acid and base the pH of the product solution will be
a)
7
b)
0
c)
14
d)
6
3.
An increase in H3O+ will cause the pH to
a)
increase
b)
decrease
c)
stay the same
4.
Both Acids and Bases conduct electricity
a)
True
b)
False
5.
Bases have the following properties except
a)
bitter taste
b)
feels slippery
c)
low pH
d)
turns red litmus paper blue
6.
The following properties, sour taste, turns blue litmus paper red, and a low pH number are properties of
a)
Acid
b)
Base
c)
Neutral substance
7.
An enzyme is an example of
a)
catalyst
b)
neutralizer
c)
inhibitor
d)
indicator
8.
In order to decrease the time it takes for a denture tablet and water to react the following could be done
a)
use less water
b)
use a whole tablet
c)
increase the temperature of water
d)
use a smaller amount of tablet
9.
If a chemical reaction is exothermic than it will
a)
feel warmer and release energy
b)
feel warmer and absorb energy
c)
feel cold and release energy
d)
feel cold and absorb energy
10.
When heat is absorbed in a chemical reaction, this is a
a)
endothermic reaction
b)
exothermic reaction
c)
neutralization reaction
11.
In a chemical reaction energy is can be released or absorbed
a)
False
b)
True
12.
What are the reactants in the following equation 4Fe + 3O2 --> 2Fe2O3
a)
Fe + O2
b)
Fe2O3
c)
Fe
d)
O2
13.
Iron(Fe) and oxygen(O2) combine to produce iron oxide (Fe2O3). The balanced equation for this reaction is
a)
2Fe + O2 --> Fe2O3
b)
4Fe + 3O2 --> 2Fe2O3
c)
2Fe2O3 --> 4Fe +3O2
d)
Fe2O3 --> 2Fe + O2
14.
A description of what happens during a chemical reaction is written with a
a)
name of a compound
b)
name of a element
c)
chemical formula
d)
chemical equation
15.
What is a product of a neutralization reaction?
a)
OH- and H+
b)
H2O
c)
H3O+
16.
A chemical reaction results in
a)
substances that can be separated by physical changes
b)
a new substance formed
c)
a change in energy (released or absorbed)
d)
both a new substance formed and a change in energy
17.
What is the mass of the products in a chemical reaction if the mass of the reactants is 10g
a)
less than 10g
b)
greater than 10 g
c)
equal to 10 g
18.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
19.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
20.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
21.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
22.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
23.
How many Al atoms are in this compound? 4Al2O3
a)
2
b)
8
c)
6
d)
4
24.
How many F atoms are in this compound?
6MgF2
a)
2
b)
6
c)
8
d)
12
25.
a copper penny turning greenish after a few years.
a)
Physical change
b)
Chemical change
26.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
27.
During Photosynthesis energy is absorbed. What kind of reaction is it?
a)
Physical
b)
Exothermic
c)
Endothermic
d)
Photothermic
28.
In an exothermic reaction, energy is _________.
a)
Released
b)
Absorbed
c)
Stored
d)
Doubled
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