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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
2
D
12
2) 4Al + 3O2 -- 2Al2O3 How many aluminum atoms?
A
4
B
8
C
2
D
1
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
element
B
compound
C
mixture
D
atom
5) Which of the following represents a COMPOUND?
A
CO
B
Fe2
C
Fe
D
Co
6) Two or more elements bonded together is always a
A
molecule
B
atom
C
compound
D
mixture
7) A compound is always a molecule but a molecule isn't always a compound.
A
True
B
False
8) C2H5NO How many different ELEMENTS are in this compound?
A
10
B
5
C
9
D
4
9) C2H5NO How many TOTAL ATOMS are in this compound?
A
10
B
9
C
5
D
2
10) C2H5NO How many atoms of Carbon (C) are in this compound?
A
10
B
2
C
5
D
0
11) When reading a chemical equation the left side of the equation is known as the___
A
yield
B
product
C
stuff we're putting together
D
reactants
12) When reading a chemical equation the right side of the equation is known as the___
A
yield
B
product
C
stuff we end up with
D
reactants
13) When reading a chemical equation the arrow is read as___
A
yields
B
equals
C
is
D
makes
14) Compounds are expressed by symbols and numbers and written as a chemical ___
A
formula
B
symbols
C
equation
15) A diagram of a Water Molecule (H2O) shows two hydrogen atoms and one oxygen atom have formed a chemical ___
A
atom
B
mixture
C
bond
D
solution
16) An expression of symbols and numbers that represent that a chemical change has taken place is known as a chemical ___
A
mixture
B
equation
C
molecule
D
formula
17) What are the most common elements in Living Things? (from most abundant to least)
A
Nitrogen, Carbon, Oxygen and Hydrogen
B
Carbon, Hydrogen, Oxygen, and Nitrogen
18) Identify which one is a molecule
A
NaCl
B
H2O2
C
H2O
D
O3
19) What are the most common elements in the Ocean? (from most abundant to least)
A
Hydrogen, Oxygen, Sodium and Chlorine
B
Hydrogen, Helium, Litium and Beryllium
C
Hydrogen, Sodium, Aluminum, Carbon
20) What are the most common elements in the Earth's Crust? (from most abundant to least)
A
Silicon, Oxygen, Iron, Aluminum, and Calcium
B
Gold, Aluminum, Silver, and Iron
C
Oxygen, Silicon, Aluminum, Iron, and Calcium
*select an answer for all questions
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