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Matter-Counting Atoms And Most Common Elements
Test Description: Counting Atoms and Most Common Elements
Instructions: Answer all questions to get your test result.
1) 4Al + 3O2 -- 2Al2O3 How many oxygen atoms?
A
1
B
6
C
12
D
2
2) 4Al + 3O2 -- 2Al2O3 How many aluminum atoms?
A
1
B
2
C
4
D
8
3) The number of atoms on the LEFT side (Reactants) _______ equals the number of atoms on the RIGHT side (Product) of a chemical equation.
A
never
B
often
C
usually
D
always
4) Two or more different elements bonded together is a ____
A
atom
B
element
C
mixture
D
compound
5) Which of the following represents a COMPOUND?
A
Fe
B
CO
C
Fe2
D
Co
6) Two or more elements bonded together is always a
A
mixture
B
molecule
C
atom
D
compound
7) A compound is always a molecule but a molecule isn't always a compound.
A
False
B
True
8) C2H5NO How many different ELEMENTS are in this compound?
A
4
B
5
C
10
D
9
9) C2H5NO How many TOTAL ATOMS are in this compound?
A
10
B
9
C
2
D
5
10) C2H5NO How many atoms of Carbon (C) are in this compound?
A
0
B
2
C
10
D
5
11) When reading a chemical equation the left side of the equation is known as the___
A
reactants
B
stuff we're putting together
C
yield
D
product
12) When reading a chemical equation the right side of the equation is known as the___
A
stuff we end up with
B
yield
C
reactants
D
product
13) When reading a chemical equation the arrow is read as___
A
equals
B
makes
C
yields
D
is
14) Compounds are expressed by symbols and numbers and written as a chemical ___
A
symbols
B
formula
C
equation
15) A diagram of a Water Molecule (H2O) shows two hydrogen atoms and one oxygen atom have formed a chemical ___
A
bond
B
solution
C
mixture
D
atom
16) An expression of symbols and numbers that represent that a chemical change has taken place is known as a chemical ___
A
equation
B
formula
C
molecule
D
mixture
17) What are the most common elements in Living Things? (from most abundant to least)
A
Carbon, Hydrogen, Oxygen, and Nitrogen
B
Nitrogen, Carbon, Oxygen and Hydrogen
18) Identify which one is a molecule
A
O3
B
NaCl
C
H2O2
D
H2O
19) What are the most common elements in the Ocean? (from most abundant to least)
A
Hydrogen, Sodium, Aluminum, Carbon
B
Hydrogen, Oxygen, Sodium and Chlorine
C
Hydrogen, Helium, Litium and Beryllium
20) What are the most common elements in the Earth's Crust? (from most abundant to least)
A
Gold, Aluminum, Silver, and Iron
B
Oxygen, Silicon, Aluminum, Iron, and Calcium
C
Silicon, Oxygen, Iron, Aluminum, and Calcium
*select an answer for all questions
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