Compounds Answers
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Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4.What mistake did Elena make?
A
She should not have multiplied the sulfur atoms by the subscript 4.B
She should not have multiplied the nitrogen atoms by the subscript 2.C
She should not have multiplied the oxygen atoms by the coefficient 3.D
She should not have multiplied the hydrogen atoms by the coefficient 3.2
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Two models of the same compound are shown.
A
Model A shows the types of elements in the compound, but Model B does not.B
Model A shows the total number of atoms in the molecule, but Model B does not.C
Model A shows the three-dimensional shape of the molecule, but Model B does not.D
Model A shows the number of atoms of each element in the molecule, but Model B does not.3
There are several different models that represent compounds. One type of model is shown.
A
a structural formulaB
a chemical formulaC
a space-filling modelD
a ball-and-stick model4
How many atoms of nitrogen are in the chemical formula Ni(NO3)2?
A
2B
1C
6D
35
How many atoms of each element are in the chemical formula P2O5?
A
2 phosphorus and 5 oxygenB
5 phosphorus and 2 oxygenC
1 phosphorus and 5 oxygenD
2 phosphorus and 1 oxygen6
There are several ways to model a compound. One type of model is shown.
A
CHOB
C4H11O2C
C6H12O2D
C6H9O7
Which is the best description of a molecule?
A
A molecule of an element is composed of at least two types of atoms.B
A molecule of a compound is composed of only one atom.C
A molecule of a compound is composed of at least two atoms.D
A molecule of an element is composed of exactly two types of atoms.8
Two models of the same compound are shown.
A
Model B shows the types of elements in the compound, but Model A does not.B
Model B shows the three-dimensional shape of the molecule, but Model A does not.C
Model B shows how the atoms in the molecule are connected, but Model A does not.D
Model B shows the number of atoms of each element in the molecule, but Model A does not.9
Which statement describes how chemical formulas, such as H2O, represent compounds?
A
They show the types of molecules that make up an atom.B
They show the elements that make up a compound.C
They show the three-dimensional shape of a molecule.D
They show the types of bonds that exist between elements.10
Which of these is a compound?
A
OB
CO2C
O2D
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