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WorksheetsChemistry Review
Total questions: 20
Worksheet time: 11mins
Name
Class
Date
1.
What's the atomic number?
a)
Number of neutrons+electrons in an element
b)
Number of protons in an element
c)
Number of valence electrons
d)
Half of the atomic mass
2.
How do you find atomic mass?
a)
Neutrons-Protons
b)
Valence Electrons+Neutrons
c)
Electrons+Protons
d)
Protons+Neutrons
3.
What are the periods in the periodic table?
a)
The 7 columns
b)
The 18 rows
c)
The 7 rows
d)
The 18 columns
4.
What are valence electrons?
a)
Total number of electrons
b)
Neutrons-Electrons
c)
Number of electrons in the outermost shell
d)
Amount of protons and electrons in an atom
5.
What happens when a chemical change is made?
a)
Matter is created
b)
Matter is destroyed
c)
Melting happens
d)
A new substance is formed
6.
What elements are presented in this equation?
H₂O
H₂O
a)
Hydrogen and Carbon
b)
Hydrogen and Oxygen
c)
Oxygen only
d)
None
7.
Is this equation balanced?
Cl₂+Fe > Cl₃+Fe
Cl₂+Fe > Cl₃+Fe
a)
Yes
b)
No
8.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
9.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
10.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
11.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
12.
Which is the correct formula for:
one carbon (C)
two oxygen (O)
one carbon (C)
two oxygen (O)
a)
CO2
b)
CO
c)
C2O
d)
2CO
13.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
14.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
15.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
16.
What do bubbles indicate during a chemical reaction?
a)
Temperature change
b)
Light production
c)
Color Change
d)
Gas production
17.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
c)
liquid properties
d)
real properties
18.
Which of the following properties is a physical property?
a)
magnetism
b)
reactivity with oxygen
c)
flammability
d)
non-reactive
19.
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
20.
What characteristic defines all chemical changes?
a)
There is a change of state.
b)
Electricity is produced.
c)
A new material is formed.
d)
Bubbles are produced.
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