Matter-Counting Atoms And Most Common Elements Question Preview (ID: 45523)
Counting Atoms And Most Common Elements.
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4Al + 3O2 -- 2Al2O3 How many oxygen atoms?
a) 6
b) 12
c) 2
d) 1
4Al + 3O2 -- 2Al2O3 How many aluminum atoms?
a) 4
b) 8
c) 2
d) 1
The number of atoms on the LEFT side (Reactants) _______ equals the number of atoms on the RIGHT side (Product) of a chemical equation.
a) always
b) never
c) usually
d) often
Two or more different elements bonded together is a ____
a) compound
b) element
c) mixture
d) atom
Which of the following represents a COMPOUND?
a) CO
b) Co
c) Fe
d) Fe2
Two or more elements bonded together is always a
a) molecule
b) compound
c) mixture
d) atom
A compound is always a molecule but a molecule isn't always a compound.
a) True
b) False
c)
d)
C2H5NO How many different ELEMENTS are in this compound?
a) 4
b) 9
c) 10
d) 5
C2H5NO How many TOTAL ATOMS are in this compound?
a) 9
b) 10
c) 2
d) 5
C2H5NO How many atoms of Carbon (C) are in this compound?
a) 2
b) 5
c) 10
d) 0
When reading a chemical equation the left side of the equation is known as the___
a) reactants
b) product
c) yield
d) stuff we're putting together
When reading a chemical equation the right side of the equation is known as the___
a) product
b) reactants
c) yield
d) stuff we end up with
When reading a chemical equation the arrow is read as___
a) yields
b) equals
c) is
d) makes
Compounds are expressed by symbols and numbers and written as a chemical ___
a) formula
b) equation
c) symbols
d)
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
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) mixture
d) molecule
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
c)
d)
Identify which one is a molecule
a) O3
b) H2O
c) NaCl
d) H2O2
What are the most common elements in the Ocean? (from most abundant to least)
a) Hydrogen, Oxygen, Sodium and Chlorine
b) Hydrogen, Sodium, Aluminum, Carbon
c) Hydrogen, Helium, Litium and Beryllium
d)
What are the most common elements in the Earth's Crust? (from most abundant to least)
a) Oxygen, Silicon, Aluminum, Iron, and Calcium
b) Gold, Aluminum, Silver, and Iron
c) Silicon, Oxygen, Iron, Aluminum, and Calcium
d)
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