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Salt - Practice Test with Answer Key - Introductory Chemistry I | CHEM 1405, Exams of Chemistry

Material Type: Exam; Professor: Newton; Class: Introductory Chemistry I; Subject: Chemistry; University: Laredo Community College; Term: Unknown 1989;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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The Chemistry of Everything (Waldron)
Chapter 4 Salt
Note: Answers are included in this practice test. This is an exception, not the
rule.
1)
An ionic interaction is _____,
A)
an attraction between positive and negative charges
B)
attraction due to shared electron pairs
C)
repulsion due to an excessive number of electrons between two atoms
D)
gain or loss of electrons to achieve an electron arrangement identical to that of a noble gas
E)
the movement of electrons from the negative electrode to the positive electrode in an electrochemical
system
Answer
:
A
Diff: 1
Type: MC
Var: 1
Page Ref: Sec 4.1
2)
Because of the strength of ionic attractions, salts generally have relatively low melting points and boiling
points.
Answer
:
False
Diff: 1
Type: TF
Var: 1
Page Ref: Sec 4.1
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Download Salt - Practice Test with Answer Key - Introductory Chemistry I | CHEM 1405 and more Exams Chemistry in PDF only on Docsity!

The Chemistry of Everything (Waldron)

Chapter 4 Salt

Note: Answers are included in this practice test. This is an exception, not the

rule.

An ionic interaction is _____,

A)

an attraction between positive and negative charges

B)

attraction due to shared electron pairs

C)

repulsion due to an excessive number of electrons between two atoms

D)

gain or loss of electrons to achieve an electron arrangement identical to that of a noble gas

E)

the movement of electrons from the negative electrode to the positive electrode in an electrochemical

system

Answer

A

Diff: 1

Type: MC

Var: 1

Page Ref: Sec 4.

Because of the strength of ionic attractions, salts generally have relatively low melting points and boiling

points.

Answer

False

Diff: 1

Type: TF

Var: 1

Page Ref: Sec 4.

A bromide ion contains _____ electrons and a bromine atom contains _____ electrons.

A)

B)

C)

D)

E)

Answer

A

Diff: 4

Type: BI

Var: 1

Page Ref: Sec 4.

A magnesium ion contains _____ electrons and a magnesium atom contains _____ electrons.

A)

B)

C)

D)

E)

Answer

An oxide ion contains the same number of electrons as a(an) atom of _____.

A)

neon

B)

fluorine

C)

oxygen

D)

nitrogen

E)

carbon

Answer

A

Diff: 4

Type: BI

Var: 1

Page Ref: Sec 4.

Unlike ionic solids, the ions in ionic liquids do not pack together tightly to form crystals because the ions

have dissimilar sizes or shapes or both.

Answer

True

Diff: 1

Type: TF

Var: 1

Page Ref: Sec 4.

Which statement is not a reason that ionic liquids remain in the liquid phase?

A)

The cations differ greatly from the anions in shape.

B)

The cations differ greatly from the anions in size.

C)

The charge of the larger ion is greatly delocalized.

D)

The charge of the smaller ion is concentrated in a very small volume.

E)

The strength of the electrostatic attractions among the ions is relatively small.

Answer

D

Diff: 4

Type: MC

Var: 1

Page Ref: Sec 4.

The formula of a newly discovered ionic liquid is C 10

H

F

NP. This compound consists of one ion of

6

PF

and one ion of C 10

H

16

N

. The molar mass of the cation is _____ g/mole.

A)

B)

C)

D)

E)

Answer

A

Diff: 9

Type: BI

Var: 1

Page Ref: Sec 4.

The formula of a newly discovered ionic liquid is C 10

H

F

NP. This compound consists of one ion of

6

PF and one ion of C 10

H

16

N

. The molar mass of the compound is _____ g/mole.

A)

B)

C)

D)

E)

Answer

E

Diff: 9

Type: BI

Var: 1

Page Ref: Sec 4.

Draw the dot structure of the carbonate ion,

2-

3

CO. Use your drawing to answer the questions.

The total number of electrons in your drawing of the carbonate ion is _____.

A)

B)

C)

D)

E)

A

Diff: 9

Type: BI

Var: 1

Page Ref: Sec 4.

The number of double bonds in your drawing of the carbonate ion is _____.

A)

B)

C)

D)

E)

impossible to determine

Answer

A

Diff: 9

Type: BI

Var: 1

Page Ref: Sec 4.

It is possible to draw three resonance-stabilized structures for the carbonate ion.

Answer

True

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

The formula for the compound calcium phosphate is Ca 3

(PO

4

2

Answer

True

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

The formula for the compound aluminum sulfate is AlSO 4

Answer

False

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

The formula for the compound ammonium nitrate is NaNO 3

Answer

False

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

A substance that acts as a drying agent by removing water from a substance is called a(an) _____.

A)

dessicant

B)

surfactant

C)

solvent

D)

solution

E)

ionic liquid

Answer

A

Diff: 1

Type: MC

Var: 1

Page Ref: Sec 4.

A molecule in which the electron density is evenly distributed over the entire surface of the molecule is

said to be polar.

Answer

False

Diff: 1

Type: TF

Var: 1

Page Ref: Sec 4.

A molecule which has polar bonds must be a polar molecule.

Answer

False

repulsion of like charges

E)

electromagnetic attractions

Answer

A

Diff: 9

Type: MC

Var: 1

Page Ref: Sec 4.

In choosing a solvent to dissolve a nonpolar substance such as grease, the best choice would be a polar

substance.

Answer

False

Diff: 9

Type: TF

Var: 1

Page Ref: Sec 4.

When sodium nitrate is dissolved in water, the oxygen of the water molecule interacts with the sodium

ion.

Answer

True

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

In a saturated solution of sodium nitrate, no changes are occurring because the amount of visible solid in

the container remains constant.

Answer

False

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

A

Diff: 4

Type: MC

Var: 1

Page Ref: Sec 4.

The symbolism which correctly represents a chloride ion dissolved in water is _____.

A)

Cl 2 (l)

B)

Cl

(aq)

C)

Cl

(l)

D)

Cl(aq)

E)

Cl 2 (aq)

Answer

B

Diff: 4

Type: MC

Var: 1

Page Ref: Sec 4.

A solution is labeled "0.60 M sucrose." This solution is _____ mM.

A)

B)

C)

D)

E)

Answer

C

Diff: 4

Type: BI

Var: 1

Page Ref: Sec 4.

The unit M represents the molarity of a solution, or moles of dissolved substance per milliliter of solution.

Answer

False

Diff: 4

Type: TF

Var: 1

Page Ref: Sec 4.

A solution is prepared by dissolving 60.0 g of glucose, C 6

H

O

, in enough water to make 0.800 L of

solution. The molarity of this solution is _____ M.

A)

B)

C)

D)

E)

Answer

A

A technician wants to dispose of 2.00 L of a 0.500 M solution by diluting it with water and pouring down

the drain. For this particular substance, this is legal if the final concentration of the contaminant is less

than 1.00 mM. How much solution will be produced when he adds enough water to get the proper

concentration?

A)

100 L

B)

1000 L

C)

0.500 L

D)

1,000,000 L

E)

4.00 L

Answer

B

Diff: 9

Type: BI

Var: 1

Page Ref: Sec 4.

A demonstration contains two compartments of liquid separated by a semipermeable membrane that only

allows water to cross.. Side A contains 200 mL 0.1 M CaCl 2

solution. Side B contains 200 mL 0.5 M

CaCl 2

solution. Which statements correctly describe the setup after the system has reached equilibrium?

A)

The level of B will be higher than it was initially.

B)

The level of B will be lower than it was initially.

C)

The level of A will be higher than it was initially.

D)

The level of A will be lower than it was initially.

E)

The levels will be the same as the initial levels.

Answer

A, D

Diff: 9

Type: MC

Var: 1

Page Ref: Sec 4.

A demonstration contains two compartments of liquid separated by a semipermeable membrane that only

allows water to cross.. Side A contains 200 mL 0.1 M CaCl 2

solution. Side B contains 200 mL 0.1 M NaCl

solution. Which statements correctly describe the setup after the system has reached equilibrium?

A)

The level of B will be higher than it was initially.

B)

The level of B will be lower than it was initially.

C)

The level of A will be higher than it was initially.

D)

The level of A will be lower than it was initially.

E)

The levels will be the same as the initial levels.

Answer

B, C

Diff: 9

Type: MC

Var: 1

Page Ref: Sec 4.

A semipermeable membrane is one which

A)

allows only certain molecules to pass from one solution to another.

B)

prevents transfer of heat from one solution to another.

C)