AnswersFL-2003310-Physical Science CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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View the table.

Question illustration
A
column 1: Atomscolumn 2: Ions
B
column 1: Crystallinecolumn 2: Noncrystalline
C
column 1: Definite shapecolumn 2: Definite volume
D
column 1: Viscouscolumn 2 : Nonviscous
42
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Sodium hydroxide (NaOH) was added to pure water (H2O). Which most likely were the pH values of the water before and after the sodium hydroxide was added to it?

A
before = 7, after = 9
B
before = 7, after = 4
C
before = 4, after = 7
D
before = 9, after = 7
43

This table shows the pH values of different solutions.

Question illustration
A
W X Y Z
Option A
B
Y W X Z
Option B
C
W X Z Y
Option C
D
Y Z X W
Option D
44

Many scientists are concerned that the Ogallala aquifer in the United States is being depleted at an alarming rate. What would most likely be a major effect of this aquifer running dry?

A
Many crops would die because irrigation water would be limited.
B
The water cycle would come to a halt in the area.
C
Farmers would have to water crops with salt water.
D
Most people in the United States would not have drinking water.
45

Which statement best describes the equation CaCO3 + 2HCl → CaCl2 + CO2 + H2O?

A
CaCO3 is a reactant; it is present before the reaction occurs.
B
CaCl2 is a reactant; it is present before the reaction occurs.
C
CO2 is a reactant because it is most likely a gas.
D
H2O is a reactant because it is most likely a liquid.
46

Which coefficient is needed in front of NaNO3 to balance the equation Na2S + Zn(NO3)2 → ZnS + _NaNO3?

A
1
B
2
C
5
D
7
47

What did Bohr’s model of the atom include that Rutherford’s model did not have?

A
a nucleus
B
energy levels
C
electron clouds
D
smaller particles
48

The atomic models after Dalton’s time included ideas about the atomic structure.Which atomic model that shows the atomic structure is missing from this set?

Question illustration
A
Niels Bohr’s model
B
Schrödinger’s model
C
Rutherford’s model
D
Thomson’s model
49

Which source is most likely an authority on the subject?

A
Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website.
B
Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.
C
Susan, an architect, presents her hand-made quilts at the Quilting Society.
D
Dr. Patel, a cardiologist, presents her findings on heart disease.
50

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?

Question illustration
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.

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