Questão 1
Questão
The separate oxidation and reduction equations are called [blank_start]half-reactions[blank_end].
Responda
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half-reactions
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oxidation
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reduction
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oxidized
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reduced
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nuclear
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pure elements
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solution
-
double displacement
Questão 2
Questão
Electrons are [blank_start]rarely[blank_end] found unattached to atoms. Thus, for one element or compound to lose electrons and be [blank_start]oxidized[blank_end], another element or compound must be there to gain the electrons and be [blank_start]reduced[blank_end]. In other words, [blank_start]oxidation[blank_end] (loss of electrons) must be accompanied by [blank_start]reduction[blank_end] (gain of electrons).
Responda
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rarely
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oxidized
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reduced
-
reduction
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oxidation
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oxidized
-
rarely
-
reduced
-
oxidation
-
reduction
-
reduced
-
rarely
-
oxidized
-
oxidation
-
reduction
-
oxidation
-
rarely
-
oxidized
-
reduced
-
reduction
-
reduction
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rarely
-
oxidized
-
reduced
-
oxidation
Questão 3
Questão
In single-displacement reactions, atoms of one element in a compound are displaced (or replaced) by atoms from a(n) [blank_start]pure element[blank_end].
Responda
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pure element
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half-reactions
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rarely
-
oxidized
-
reduced
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oxidation
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reducation
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nuclear
-
solution
-
double displacement
Questão 4
Questão
What is the oxidation number for H in \[H_2\]?
Questão 5
Questão
Classify the following reaction:
\[Zn(C_2H_3O_2)_2(aq) + Na_2S(aq) --> ZnS(s) + 2 NaC_2H_3O_2(aq)\]
Responda
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Single Displacement
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Double Displacement
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Combination/Synthesis
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Decomposition
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Acid/Base
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Combustion
Questão 6
Questão
Another factor that affects the actual yield is a reaction's rate. Sometimes a reaction is so [blank_start]slow[blank_end] that it has not reached the maximum yield by the time the product is isolated.
Responda
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slow
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fast
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equilibrium
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reversible
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solute
-
solvent
Questão 7
Questão
If a calculation calls for you to convert from an amount of one substance in a given chemical reaction to the corresponding amount of another substance participating in the same reaction, it is an equation [blank_start]stoichiometry[blank_end] problem.
Responda
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stoichiometry
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slow
-
fast
-
reversible
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equilibrium
-
solute
-
solvent
-
solution
Questão 8
Questão
Molarity (abbreviated M) is defined as moles of [blank_start]solute[blank_end] per liter of [blank_start]solution[blank_end].
Responda
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solute
-
solvent
-
solution
-
slow
-
fast
-
stochiometry
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reversible
-
solution
-
solute
-
solvent
-
stoichiometry
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slow
-
fast
-
reversible
Questão 9
Questão
There are many reasons why the actual yield in a reaction might be less than the theoretical yield. One key reason is that many chemical reactions are significantly [blank_start]reversible[blank_end].
Responda
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reversible
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fast
-
slow
-
equilibrium
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forward
-
solute
-
solvent
-
solution
-
stoichiometric
Questão 10
Questão
Even if 100% of the limiting reactant proceeds to products, usually the product still needs to be [blank_start]separated[blank_end] from the other components in the product mixture (excess reactants, products of side reactions, and other impurities). This process generally leads to some loss of product.
Responda
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separated
-
reversible
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added
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equilibrium
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slow
-
fast
Questão 11
Questão
The particles in a gas are constantly colliding with the walls of the container and with each other. Because of these collisions, the gas particles are constantly changing their direction of [blank_start]motion[blank_end] and their [blank_start]velocity[blank_end].
Responda
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motion
-
velocity
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force
-
acceleration
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solute
-
solvent
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molarity
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point-masses
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velocity
-
motion
-
force
-
acceleration
-
point-masses
-
solute
-
solvent
Questão 12
Questão
Each time a gas particle collides with and ricochets off one of the walls of its container, it exerts a(n) [blank_start]force[blank_end] against the wall. The sum of the forces of these ongoing collisions of gas particles against all the container's interior walls creates a continuous pressure upon those walls.
Responda
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force
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pressure
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motion
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velocity
-
acceleration
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separate
-
point-masses
Questão 13
Questão
The particles of an ideal gas are assumed to be [blank_start]point-masses[blank_end], that is, particles that have a mass but occupy no volume.
Responda
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point-masses
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force
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motion
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velocity
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acceleration
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pressure
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pure elements
Questão 14
Questão
There are [blank_start]760[blank_end] mmHg per atm.
Questão 15
Questão
If the difference in electronegativity between two atoms is greater than 1.7, we expect the bond between them to be [blank_start]ionic[blank_end].
Responda
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ionic
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nonpolar covalent
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polar covalent
-
metallic
Questão 16
Questão
Weaker attractions between particles lead to a(n) [blank_start]higher[blank_end] rate of evaporation.
Responda
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higher
-
lower
-
limited
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attract
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repel
-
separate
Questão 17
Questão
The higher an element's electronegativity, the greater its ability to [blank_start]attract[blank_end] electrons from other elements.
Responda
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attract
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repel
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higher
-
lower
-
separate
Questão 18
Questão
The temperature at which the equilibrium vapor pressure of a liquid equals 1 atmosphere is called its normal [blank_start]boiling point[blank_end].
Responda
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boiling point
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freezing point
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melting point
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deposition point
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sublimation point
Questão 19
Questão
Nonpolar substances are likely to dissolve in [blank_start]nonpolar solvents[blank_end].
Responda
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nonpolar solvents
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polar solvents
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soluble products
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insoluble products
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anions
-
cations
Questão 20
Questão
Decane, \[C_{10}H_{22}\], would be expected to be soluble in hexane.
Questão 21
Questão
Soap helps to clean a greasy dish by
Responda
-
keeping oil droplets from regrouping and returning to the surface of the dish.
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embedding the nonpolar hydrocarbon ends of the soap anions into the nonpolar triglyceride droplets, while the anionic ends remain sticking out into the water.
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making it so triglyceride droplets repel each other when they come close.
-
incorporating all of the above actions.
Questão 22
Questão
The compound decane, \[C_{10}H_{22}\], is
Responda
-
an ionic compound and therefore polar.
-
a nonpolar molecular compound.
-
a molecular compound with small polar molecules.
Questão 23
Questão
If more than 10 grams of a substance will dissolve in 100 milliliters (or 100 g) of solvent, the substance is considered [blank_start]soluble[blank_end].
Responda
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soluble
-
insoluble
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polar
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nonpolar
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miscible
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organic
-
inorganic
Questão 24
Questão
If more than [blank_start]10[blank_end] grams of substance will dissolve in 100 milliliters (or 100 g) of solvent, the substance is considered soluble.
Questão 25
Questão
If we need to predict the relative water solubility of two similar molecules, we can expect the one with the proportionally [blank_start]larger[blank_end] polar portion to have higher water solubility.
Responda
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larger
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small
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non
-
insoluble
-
organic
-
inorganic
Questão 26
Questão
Substances composed of [blank_start]small[blank_end] polar molecules are usually soluble in water.
Responda
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small
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larger
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miscible
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temperature
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organic
-
inorganic
Questão 27
Questão
When two liquids mix in any proportion without any limit to their solubility, they are called [blank_start]miscible[blank_end].
Questão 28
Questão
The net rate of solution depends on three factors: [blank_start]surface area of the solute[blank_end], degree of agitation or stirring, and temperature.
Questão 29
Questão
[blank_start]amine[blank_end] have the following general structure. (Type the word that best completes this sentence. Do not type any spaces.)
\[R1--NH_2\]
Questão 30
Questão
Identify each of the following:
(a) glucose
[blank_start]monosaccharide[blank_end]
(b) amylopectin
[blank_start]polysaccharide[blank_end]
(c) lactose
[blank_start]disaccharide[blank_end]
Responda
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monosaccharide
-
polysaccharide
-
disaccharide
Questão 31
Questão
Is the following a pair of isomers or different representations of the same thing?
[blank_start]Isomers[blank_end]
Questão 32
Questão
Is the following a pair of isomers or different representations of the same thing?
[blank_start]Isomers[blank_end]
Questão 33
Questão
Is the following a pair of isomers or different representations of the same thing?
[blank_start]The same thing[blank_end]
Questão 34
Questão
[blank_start]polymer[blank_end] are large molecules composed of repeating units. (Type the word that best completes this sentence. Do not type any spaces.)
Questão 35
Questão
The digestion of proteins begins in the stomach. The [blank_start]acidic[blank_end] conditions there weaken the links that maintain the protein molecules' tertiary structure. This process is called [blank_start]denaturation[blank_end], because the loss of tertiary structure causes a corresponding loss of the protein's "natural" function.
Responda
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acidic
-
denaturation
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polymer
-
ester
-
alkyne
-
small section
-
denaturation
-
acidic
-
polymer
-
ester
-
alkyne
-
small section
Questão 36
Questão
Starches and cellulose are polysaccharides.
Questão 37
Questão
An [blank_start]ester[blank_end] has the following general structure. (Type the word that best completes this sentence. Do not type any spaces.)
Questão 38
Questão
The following structure represents a(n) [blank_start]alkyne[blank_end].
Questão 39
Questão
When a(n) [blank_start]small section[blank_end] of an organic molecule is largely responsible for the molecule's chemical and physical characteristics, that section is called a functional group.
Responda
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small section
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large piece
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ester
-
amine
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acidic
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polymer
-
denaturation
Questão 40
Questão
When an atom undergoes positron emission, the mass number (or nucleon number) of the resulting atom [blank_start]stays the same[blank_end].
Responda
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stays the same
-
increases
-
decreases
Questão 41
Questão
Because the amount of energy [blank_start]released[blank_end] when a nucleus is formed is a reflection of the strength with which nucleons are bound, it is called the atom's binding energy.
Responda
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released
-
gained
-
stays the same
-
increases
-
decreases
Questão 42
Questão
There appears to be something stable about having 2, 8, 20, 28, 50, 82, or 126 protons or neutrons. The nuclides with [blank_start]double magic numbers[blank_end] have very high stability.
Responda
-
double magic numbers
-
a single magic number
-
a decrease of 4
Questão 43
Questão
When an atom undergoes alpha emission, the mass number (or nucleon number) of the resulting atom [blank_start]decreases by 4[blank_end].
Responda
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decreases by 4
-
increases by 2
-
doubles
-
triples
-
decreases by 2
-
increases by 4
Questão 44
Questão
It takes about [blank_start]10,000[blank_end] times as much energy to remove a proton or a neutron from the nucleus of a hydrogen-2 atom as to remove its one electron.
Responda
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10,000
-
0
-
100
-
1000
-
100,000
Questão 45
Questão
[blank_start]Beta particles[blank_end] from a source outside the body can penetrate the outer layers of the skin, but they will be stopped before they reach the vital organs.
Responda
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Beta particles
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Alpha particles
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Positron emmision
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Gamma rays
-
Electron capture
Questão 46
Questão
Free radicals are less reactive than other molecules.
Questão 47
Questão
For atoms [blank_start]smaller than[blank_end] iron-56, energy is released when smaller atoms combine to form larger ones.
Responda
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smaller than
-
larger than
-
increasing
-
decreasing
-
released
-
gained
Questão 48
Questão
For atoms [blank_start]larger than[blank_end] iron-56, splitting larger atoms to form more stable, smaller atoms releases energy.
Responda
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larger than
-
smaller than
-
gains
-
loses
-
increases
-
decreases
Questão 49
Questão
Polonium-210 is used in radiation therapy.
(a) What is its atomic number and mass number.
atomic number [blank_start]84[blank_end]
mass number [blank_start]210[blank_end]
(b) How many protons and how many neutrons are in the nucleus of each atom?
protons [blank_start]84[blank_end]
neutrons [blank_start]126[blank_end]
Questão 50
Questão
Classify each of the following as organic or inorganic (not organic) compounds.
(a) hexane, \[C_6H_{14}\], in gasoline
[blank_start]organic[blank_end]
(b) water, \[H_2O\], in your body
[blank_start]inorganic[blank_end]
(c) ethyl butanoate, \[CH_3CH_2CH_2CO_2CH_2CH_3\], in a pineapple
[blank_start]also organic[blank_end]
Responda
-
organic
-
inorganic
-
also organic