AnswersChemistryN/A

N/A — Exam Answers

50 verified answers
1
Free Preview

Which statement can be placed in the blank cell to make the information in the table accurate?

A
are made of charged particles
B
can be amorphous
C
are made of neutral particles
D
can be crystalline
2
Free Preview

What is the name of this hydrocarbon?

A
1-ethyne
B
1-ethane
C
1-butyne
D
1-pentyne
3

A beam of light passes though a liquid in a test tube without scattering. Which type of mixture is most likely in the test tube?

A
emulsion
B
solution
C
colloid
D
suspension
4

Which best describes the function of a centrifuge?

A
to separate a mixture by heating it for a long period of time
B
to separate the undissolved particles of a mixture into layers
C
to separate the dissolved part of a solution into layers
D
to separate the solute from the solvent
5

Consider the redox reaction. 2 Al s plus 6 HCl A q rightarrow 2 AlCl sub 3 A q plus 3 cap h sub 2 g Which statement correctly describes a half-reaction that is taking place?

A
Aluminum is oxidized from 0 to plus 3 .
B
Chlorine is reduced from negative 1 to 0 .
C
Hydrogen is oxidized from plus 1 to 0 .
D
Hydrogen is reduced from 0 to negative 1 .
6

Ethylene, a gas found in nature, is commonly used to ripen bananas and other fruits. Which compound is ethylene?

A
Image with description Two carbons are triple bonded to each other; each is single bonded to H to the outside.
B
Image with description A skeletal model with a chain beginning with O H, then line segments going up, down, up and ending at another O H.
C
Image with description 2 C H 2 are single bonded to each other, and both are single bonded to the same O.
D
Image with description 2 carbons are double-bonded to each other; the pair are single bonded to H above left, above right, below right, and below left.
7

This reaction occurs in a car’s catalytic converter. 2 NO g plus 2 CO g rightarrow cap n sub 2 times g plus 2 CO sub 2 g Which answer best describes the reducing and oxidizing processes in this reaction?

A
NO and CO are both oxidizing agents.
B
The oxidation state of nitrogen in NO changes from plus 2 to 0 , and the oxidation state of carbon in CO changes from plus 2 to plus 4 as the reaction proceeds.
C
The oxidation state of nitrogen in NO changes from 0 to plus 2 , and the oxidation state of carbon in CO changes from plus 4 to plus 2 as the reaction proceeds.
D
NO and CO are both reducing agents.
8

Consider the chemical reaction in equilibrium. cap h sub 2 plus cap i sub 2 plus heat if and only if 2 HI What will happen to the chemical equilibrium if the temperature of the system is increased?

A
The direction of the chemical equilibrium will shift to the left, favoring the reverse reaction.
B
The chemical equilibrium will be lost permanently with a change of temperature.
C
The chemical equilibrium will not be affected by an increase in temperature.
D
The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
9

Which term describes this reaction? Expand Image

A
elimination
B
substitution
C
addition
D
condensation
10

Water is dissolved into n - butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n - butanol?

A
n - Butanol molecules are attracted to the surface of the water molecules.
B
Water molecules are carried into n -butanol.
C
n - Butanol molecules surround water molecules.
D
n - Butanol mixes with water.
11

The molar mass of NaOH is 40 point 0 0 g/mol If 5 point 2 0 g NaOH are dissolved in 0 point 5 0 0 liters of solution, what is the molarity of the solution? Use molarity is equal to moles of solute over liters of solution

A
3 point 8 5 cap m
B
7 point 6 9 cap m
C
0 point 0 1 2 5 cap m
D
0 point 2 6 0 cap m
12

Which is the first step in the dissolving process?

A
The solute molecules are carried into the solution.
B
The solvent molecules are attracted to particles at the surface of the solute.
C
The solvent molecules surround the solute particles.
D
The solute becomes like the solvent.
13

How much of a sample remains after five half-lives have occurred?

A
1 over 32 of the original sample
B
1 fifth of the original sample
C
1 over 25 of the original sample
D
1 over 64 of the original sample
14

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use?

A
breaking a matchstick
B
burning a candle
C
dissolving sugar in water
D
bending a piece of aluminum
15

Ca OH sub 2 is added to a large beaker of water. How is the solution different from the original water?

A
The solution turns blue litmus to red.
B
The solution has fewer hydroxide ions.
C
The solution turns phenolphthalein pink.
D
The solution has more hydrogen ions.
16

Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?

A
Energy is removed from the particles in each change, but more energy is removed in boiling than in melting because the attractions are weaker.
B
Energy is added to the particles in each change, but melting requires more energy than boiling because the attractions must be completely overcome.
C
Energy is removed from the particles in each change, but more energy is removed in melting than in boiling because the attractions are weaker.
D
Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.
17

Two students are given two different size blocks of the same substance and are instructed to determine the properties of the substance. Which statement describes a property that will be the same for both students?

A
mass because it is an extensive property
B
boiling point because it is an intensive property
C
volume because it is an intensive property
D
length because it is an extensive property
18

A student requires 2 point 0 0 liters of 0 point 1 0 0 cap m NH sub 4 NO sub 3 from a 1 point 7 5 cap m NH sub 4 NO sub 3 stock solution. What is the correct way to get the solution? Use cap m sub i cap v sub i is equal to cap m sub f cap v sub f

A
Measure 114 milliliters of the 1 point 7 5 cap m solution, and dilute it to 2 point 0 0 liters .
B
Measure 8 point 7 5 milliliters of the 0 point 1 0 0 cap m solution, and dilute it to 2 point 0 0 liters .
C
Measure 8 point 7 5 milliliters of the 1 point 7 5 cap m solution, and dilute it to 2 point 0 0 liters .
D
Measure 114 milliliters of the 1 point 7 5 cap m solution, and dilute it to 1 point 0 0 liters .
19

What is a common use of bases?

A
as a component of car batteries
B
as a component of vinegar
C
to make foods tart
D
to reduce indigestion
20

Which best describes the functional group in an aldehyde?

A
an negative OH group and a carbonyl group attached to the main chain
B
a carboxylic acid bonded on each side to a carbon chain
C
a carbon chain with a carbonyl group bonded to one end
D
a carbonyl group inserted into the main chain

Did you find these answers helpful?

More from this Course

practice exam
28 verified answers

Practice Exam

Quiz
24 verified answers

Test

Quiz
25 verified answers

Test