NEW
Font size
S
M
L
XL
WorksheetsExam 2 Review
Total questions: 40
Worksheet time: 23mins
Name
Class
Date
1.
What is the formula for carbon dioxide?
a)
CH4
b)
CO2
c)
NaCl
d)
H2O
2.
How many oxygen atoms are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
3.
Why do atoms bond?
a)
To create a new substance
b)
To become less chemically stable
c)
To become more chemically stable
d)
To gain more protons
4.
When atoms bond, which subatomic particle is transferred or shared?
a)
nucleus
b)
neutron
c)
electron
d)
proton
5.
Describe the relationship between the carbon and the hydrogens in a molecule of methane.
a)
The carbon donates electrons to the hydrogens in an ionic bond
b)
The hydrogens donate electrons to the carbon in an ionic bond
c)
They share electrons in a covalent bond
d)
The atoms do not react with each other
6.
How do you know if a chemical change has occurred?
a)
If the substance changes from a solid to a liquid
b)
If a new substance is produced
c)
If the two substances separate
7.
If two liquids are poured into a test tube and one settles to the bottom while the other rises to the top, did a chemical reaction occur?
a)
YES
b)
NO
8.
If heat is added to a reaction and a new substance is formed, a ____________ ____________ has occurred.
a)
physical change
b)
chemical change
9.
What could explain why the mass of the product is less than the mass of the reactants?
a)
There was no reaction
b)
The product was more dense than the reactants
c)
One of the products was a gas
d)
The Law of Conservation of Mass doesn't apply
10.
How can you tell that an exothermic reaction has occurred?
a)
The container feels cooler after the reaction
b)
The container feels warmer after the reaction
c)
You cannot determine unless you have a thermometer
11.
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
How many atoms in the reactants?
How many atoms in the products?
Is this equation balanced?
How many atoms in the reactants?
How many atoms in the products?
Is this equation balanced?
a)
24/36/NO
b)
36/36/YES
c)
36/24/YES
d)
12/12/NO
12.
Which equation is balanced?
a)
2Fe + CO2 → Fe + 2CO
b)
Fe + 2CO → 2FeCO
c)
2Fe + 2CO → 2FeCO
d)
2FeCO2 → 2FeCO
13.
What characteristic of an atom is closely related to its chemical reactivity?
a)
protons
b)
neutrons
c)
valence electrons
d)
nucleus
14.
Which represents the Law of Conservation of Mass?
a)
I
b)
II
c)
III
d)
IV
15.
Why doesn't the energy of the reactants equal the energy of the products?
a)
It was an exothermic reaction
b)
It was an endothermic reaction
16.
What does it mean if a chemical equation is balanced?
a)
The mass of the products is greater than the mass of the reactants.
b)
The mass of the products equals the mass reactants.
c)
The mass of the reactants is greater than the mass of the products.
d)
The mass of the products is twice the mass of the reactants.
17.
As the pH of a substance becomes more basic, what happens to the number on the pH scale?
a)
It goes down
b)
It increases
c)
It decreases
d)
It stays the same
18.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
19.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
20.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
21.
Is this substance acidic, basic, or neutral?
a)
Acidic
b)
Basic
c)
Neutral
22.
Is this substance acidic, basic, or neutral?
a)
Acidic
b)
Basic
c)
Neutral
23.
What does the pH scale measure?
a)
Concentration of oxygen Ions
b)
Concentration of hydrogen Ions
c)
The amount of salt in a solution
d)
The density
24.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
25.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
26.
Which is an acid?
a)
Turns blue litmus red
b)
Turns red litmus blue
c)
Has a pH of 11
d)
Has a pH of 7
27.
Which of the following is a property of an acid?
a)
Tastes bitter
b)
Feels slippery
c)
Turns red litmus paper blue
d)
Reacts with metals
28.
Which of the following is a property of an base?
a)
Tastes sour
b)
Reacts with metals
c)
Turns blue litmus paper red
d)
Turns red litmus paper blue
29.
What substance would neutralize an acid?
a)
Lemon juice
b)
Baking soda
c)
Hydrochloric Acid
d)
Sulfuric Acid
30.
The lower the number on the pH scale, the ___________ the acid.
a)
weaker
b)
stronger
31.
What happens when you mix an acid with a base?
a)
Explosion reaction
b)
Neutralization reaction
c)
Decomposition reaction
d)
Endothermic reaction
32.
Which steps are in order to determine the pH of a solid?
A. Test with litmus paper
B. Grind some of the substance to make a powder
C. Dissolve the substance in water
D. Look at any changes
A. Test with litmus paper
B. Grind some of the substance to make a powder
C. Dissolve the substance in water
D. Look at any changes
a)
ABCD
b)
BCAD
c)
CBDA
d)
DCBA
33.
Do acids have a low or high pH?
a)
Low
b)
High
34.
Which of the following is a correct statement about how bases differ from acids?
a)
Bases greater [OH-]
b)
Bases have greater [H+]
c)
Bases have a lower pH
d)
Bases react with metals
35.
An atom has 11 protons and 1 valence electron, what can you determine from this information?
a)
It is hydrogen and it is unreactive
b)
It is sodium and it is slightly reactive
c)
It is hydrogen and it is very reactive
d)
It is sodium and it is highly reactive
36.
Which of the following is NOT a property of a metal?
a)
lustrous
b)
ductile
c)
malleable
d)
brittle
37.
Which of the following elements is a metal?
a)
Nitrogen
b)
Argon
c)
Aluminum
d)
Fluorine
38.
How are graduated cylinders different from beakers?
a)
Beakers are only made of glass
b)
Graduated cylinders are more accurate
c)
Graduated cylinders are for measuring mass
d)
Beakers are more accurate
39.
The graph tells us that which statement is true?
a)
As atomic mass increases, atomic weight decreases
b)
As atomic mass increases, atomic weight increases
40.
Where are metals found on the periodic table?
a)
left side
b)
right side
c)
top
d)
bottom
Reset
