8649628
Descripción
Test por Kara Hauber, actualizado hace más de 1 año
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Creado por Kara Hauber
hace alrededor de 7 años
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Pregunta 1
Pregunta
The separate oxidation and reduction equations are called [blank_start]half-reactions[blank_end].
Respuesta
-
half-reactions
-
oxidation
-
reduction
-
oxidized
-
reduced
-
nuclear
-
pure elements
-
solution
-
double displacement
Pregunta 2
Pregunta
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).
Respuesta
-
rarely
-
oxidized
-
reduced
-
reduction
-
oxidation
-
oxidized
-
rarely
-
reduced
-
oxidation
-
reduction
-
reduced
-
rarely
-
oxidized
-
oxidation
-
reduction
-
oxidation
-
rarely
-
oxidized
-
reduced
-
reduction
-
reduction
-
rarely
-
oxidized
-
reduced
-
oxidation
Pregunta 3
Pregunta
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].
Respuesta
-
pure element
-
half-reactions
-
rarely
-
oxidized
-
reduced
-
oxidation
-
reducation
-
nuclear
-
solution
-
double displacement
Pregunta 4
Pregunta
What is the oxidation number for H in \[H_2\]?
Respuesta
-
-2
-
-1
-
0
-
+1
-
+2
Pregunta 5
Pregunta
Classify the following reaction:
\[Zn(C_2H_3O_2)_2(aq) + Na_2S(aq) --> ZnS(s) + 2 NaC_2H_3O_2(aq)\]
Respuesta
-
Single Displacement
-
Double Displacement
-
Combination/Synthesis
-
Decomposition
-
Acid/Base
-
Combustion
Pregunta 6
Pregunta
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.
Respuesta
-
slow
-
fast
-
equilibrium
-
reversible
-
solute
-
solvent
Pregunta 7
Pregunta
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.
Respuesta
-
stoichiometry
-
slow
-
fast
-
reversible
-
equilibrium
-
solute
-
solvent
-
solution
Pregunta 8
Pregunta
Molarity (abbreviated M) is defined as moles of [blank_start]solute[blank_end] per liter of [blank_start]solution[blank_end].
Respuesta
-
solute
-
solvent
-
solution
-
slow
-
fast
-
stochiometry
-
reversible
-
solution
-
solute
-
solvent
-
stoichiometry
-
slow
-
fast
-
reversible
Pregunta 9
Pregunta
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].
Respuesta
-
reversible
-
fast
-
slow
-
equilibrium
-
forward
-
solute
-
solvent
-
solution
-
stoichiometric
Pregunta 10
Pregunta
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.
Respuesta
-
separated
-
reversible
-
added
-
equilibrium
-
slow
-
fast
Pregunta 11
Pregunta
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].
Respuesta
-
motion
-
velocity
-
force
-
acceleration
-
solute
-
solvent
-
molarity
-
point-masses
-
velocity
-
motion
-
force
-
acceleration
-
point-masses
-
solute
-
solvent
Pregunta 12
Pregunta
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.
Respuesta
-
force
-
pressure
-
motion
-
velocity
-
acceleration
-
separate
-
point-masses
Pregunta 13
Pregunta
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.
Respuesta
-
point-masses
-
force
-
motion
-
velocity
-
acceleration
-
pressure
-
pure elements
Pregunta 14
Pregunta
There are [blank_start]760[blank_end] mmHg per atm.
Respuesta
-
760
Pregunta 15
Pregunta
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].
Respuesta
-
ionic
-
nonpolar covalent
-
polar covalent
-
metallic
Pregunta 16
Pregunta
Weaker attractions between particles lead to a(n) [blank_start]higher[blank_end] rate of evaporation.
Respuesta
-
higher
-
lower
-
limited
-
attract
-
repel
-
separate
Pregunta 17
Pregunta
The higher an element's electronegativity, the greater its ability to [blank_start]attract[blank_end] electrons from other elements.
Respuesta
-
attract
-
repel
-
higher
-
lower
-
separate
Pregunta 18
Pregunta
The temperature at which the equilibrium vapor pressure of a liquid equals 1 atmosphere is called its normal [blank_start]boiling point[blank_end].
Respuesta
-
boiling point
-
freezing point
-
melting point
-
deposition point
-
sublimation point
Pregunta 19
Pregunta
Nonpolar substances are likely to dissolve in [blank_start]nonpolar solvents[blank_end].
Respuesta
-
nonpolar solvents
-
polar solvents
-
soluble products
-
insoluble products
-
anions
-
cations
Pregunta 20
Pregunta
Decane, \[C_{10}H_{22}\], would be expected to be soluble in hexane.
Respuesta
- True
- False
Pregunta 21
Pregunta
Soap helps to clean a greasy dish by
Respuesta
-
keeping oil droplets from regrouping and returning to the surface of the dish.
-
embedding the nonpolar hydrocarbon ends of the soap anions into the nonpolar triglyceride droplets, while the anionic ends remain sticking out into the water.
-
making it so triglyceride droplets repel each other when they come close.
-
incorporating all of the above actions.
Pregunta 22
Pregunta
The compound decane, \[C_{10}H_{22}\], is
Respuesta
-
an ionic compound and therefore polar.
-
a nonpolar molecular compound.
-
a molecular compound with small polar molecules.
Pregunta 23
Pregunta
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].
Respuesta
-
soluble
-
insoluble
-
polar
-
nonpolar
-
miscible
-
organic
-
inorganic
Pregunta 24
Pregunta
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.
Respuesta
-
10
-
5
-
0
Pregunta 25
Pregunta
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.
Respuesta
-
larger
-
small
-
non
-
insoluble
-
organic
-
inorganic
Pregunta 26
Pregunta
Substances composed of [blank_start]small[blank_end] polar molecules are usually soluble in water.
Respuesta
-
small
-
larger
-
miscible
-
temperature
-
organic
-
inorganic
Pregunta 27
Pregunta
When two liquids mix in any proportion without any limit to their solubility, they are called [blank_start]miscible[blank_end].
Respuesta
-
miscible
Pregunta 28
Pregunta
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.
Respuesta
-
surface area of the solute
-
amount of mass
-
perimeter of the substance
-
solubility
-
insolubility
Pregunta 29
Pregunta
[blank_start]amine[blank_end] have the following general structure. (Type the word that best completes this sentence. Do not type any spaces.)
\[R1--NH_2\]
Respuesta
-
amine
Pregunta 30
Pregunta
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]
Respuesta
-
monosaccharide
-
polysaccharide
-
disaccharide
Pregunta 31
Pregunta
Is the following a pair of isomers or different representations of the same thing?
[blank_start]Isomers[blank_end]
Respuesta
-
Isomers
-
The same thing
Pregunta 32
Pregunta
Is the following a pair of isomers or different representations of the same thing?
[blank_start]Isomers[blank_end]
Respuesta
-
Isomers
-
The same thing
Pregunta 33
Pregunta
Is the following a pair of isomers or different representations of the same thing?
[blank_start]The same thing[blank_end]
Respuesta
-
The same thing
-
Isomers
Pregunta 34
Pregunta
[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.)
Respuesta
-
polymer
Pregunta 35
Pregunta
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.
Respuesta
-
acidic
-
denaturation
-
polymer
-
ester
-
alkyne
-
small section
-
denaturation
-
acidic
-
polymer
-
ester
-
alkyne
-
small section
Pregunta 36
Pregunta
Starches and cellulose are polysaccharides.
Respuesta
- True
- False
Pregunta 37
Pregunta
An [blank_start]ester[blank_end] has the following general structure. (Type the word that best completes this sentence. Do not type any spaces.)
Respuesta
-
ester
Pregunta 38
Pregunta
The following structure represents a(n) [blank_start]alkyne[blank_end].
Respuesta
-
alkyne
-
alkane
-
alkene
Pregunta 39
Pregunta
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.
Respuesta
-
small section
-
large piece
-
ester
-
amine
-
acidic
-
polymer
-
denaturation
Pregunta 40
Pregunta
When an atom undergoes positron emission, the mass number (or nucleon number) of the resulting atom [blank_start]stays the same[blank_end].
Respuesta
-
stays the same
-
increases
-
decreases
Pregunta 41
Pregunta
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.
Respuesta
-
released
-
gained
-
stays the same
-
increases
-
decreases
Pregunta 42
Pregunta
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.
Respuesta
-
double magic numbers
-
a single magic number
-
a decrease of 4
Pregunta 43
Pregunta
When an atom undergoes alpha emission, the mass number (or nucleon number) of the resulting atom [blank_start]decreases by 4[blank_end].
Respuesta
-
decreases by 4
-
increases by 2
-
doubles
-
triples
-
decreases by 2
-
increases by 4
Pregunta 44
Pregunta
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.
Respuesta
-
10,000
-
0
-
100
-
1000
-
100,000
Pregunta 45
Pregunta
[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.
Respuesta
-
Beta particles
-
Alpha particles
-
Positron emmision
-
Gamma rays
-
Electron capture
Pregunta 46
Pregunta
Free radicals are less reactive than other molecules.
Respuesta
- True
- False
Pregunta 47
Pregunta
For atoms [blank_start]smaller than[blank_end] iron-56, energy is released when smaller atoms combine to form larger ones.
Respuesta
-
smaller than
-
larger than
-
increasing
-
decreasing
-
released
-
gained
Pregunta 48
Pregunta
For atoms [blank_start]larger than[blank_end] iron-56, splitting larger atoms to form more stable, smaller atoms releases energy.
Respuesta
-
larger than
-
smaller than
-
gains
-
loses
-
increases
-
decreases
Pregunta 49
Pregunta
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]
Respuesta
-
84
-
210
-
84
-
126
Pregunta 50
Pregunta
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]
Respuesta
-
organic
-
inorganic
-
also organic
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