Test
Exam 1
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Preguntas del test (90)
1An example of basic research
- Athe study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone.
- Bthe design of new batteries for electric cars.
- Cthe study of the composition of the atom.
- Dthe development of new plastics that can be recycled.
- Ethe study of natural compounds in sea animals to look for new molecules that can be used for medicine.
2Which element has the atomic number 12?
- AMg
- BBe
- CB
- DNa
- EC
3Would you use a physical model or a conceptual model to describe the following: a gold coin, dollar bill, car engine, air pollution, virus, spread of sexually transmitted disease?
- AYou could adequately describe all of the topics by either model. The choice depends only on the characteristics requiring description.
- Bphysical model-gold coin, dollar bill, car engine; conceptual model-virus, air pollution, spread of sexually transmitted disease
- Cconceptual model-gold coin, car engine, virus; physical model-air pollution, spread of sexually transmitted disease, dollar bill
- Dphysical model-gold coin, car engine, virus; conceptual model-air pollution, spread of sexually transmitted disease; dollar bill, which could represent wealth, may well be described by either model.
4The following statement describes which subatomic particle best?
It is a nucleon.- Aan electron
- Ba proton
- Ca neutron
- DA and B
- EB and C (a proton, a neutron)
5Which of the following elements are in the same period as magnesium (Mg)?
- ACa
- BCl
- CSr
- DMn
- Enone of the above
6What are metalloids?
- Aelements that have some properties like metals and some like nonmetals
- Belements that are smaller than metals
- Celements that have properties different than either the metals or the nonmetals
- Delements found in asteroids
- Eelements that are larger than nonmetals
7Which of these is not a metal?
- Alithium (atomic no. = 3)
- Bvanadium (atomic no. = 23)
- Cgallium (atomic no. = 31)
- Dselenium (atomic no. = 34)
- Epotassium (atomic no. = 19)
8If all the molecules of a body remained part of that body, would the body have any odor?
- ANo, because it would no longer be what it was
- BNo, because there would be no molecules traveling to our nose.
- CYes, but only if that body is sweating.
- DYes, because it would still release photons.
9Which of the following elements is a transition metal?
- Alead (Pb)
- Bxenon (Xe)
- Csilver (Ag)
- Dlithium (Li)
- Echlorine (Cl)
10Which of the following statements about electrons is true?
- AElectrons have a negative charge.
- BElectrons are particles.
- CElectrons in atoms can be excited by light energy.
- DElectrons behave like waves.
- Eall of the above
11How many different elements are in the compound C6H12O6?
- A3
- B24
- C6
- DAll of the elements are the same.
12Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.
- Aphysical; physical; chemical; physical
- Bchemical; physical; chemical; chemical
- Cchemical; physical; physical; physical
- Dchemical; physical; chemical; physical
13How many electrons are there in the third shell of sodium, Na (atomic number 11)?
- Anone
- Bone
- Ctwo
- Dthree
14Which of the following would be considered a chemical property?
- Amelting temperature
- Breactivity towards water
- Cboiling temperature
- Dconductivity
- Eflexibility
15Which of the following is not a nonmetal?
- Asulfur (atomic no. = 16)
- Bxenon (atomic no. = 54)
- Ctitanium (atomic no. = 22)
- Dselenium (atomic no. = 34)
- Ehelium (atomic no. = 2)
16A beam of protons and a beam of neutrons of the same energy are both harmful to living tissue. The beam of neutrons, however, is less harmful. Why?
- ANeutrons carry no electric charge and thus have a greater likelihood of passing through the tissue.
- BNeutrons are much smaller and lighter than protons and would do less damage.
- CNeutrons travel at reduced speed compared to the speed at which protons travel.
- DAll of the above are reasons why neutrons are less harmful.
17Which of the following statements is true about Bohr's planetary model of the atom?
- AThe electrons smoothly move from one orbit to the next.
- BIt is a physical model.
- CThe electrons orbit around the nucleus.
- DThe energy difference between the orbits is continuous.
- Enone of the above
18The following statement describes which subatomic particle best?
It is located outside of the nucleus.- Aan electron
- Ba proton
- Ca neutron
- DA and B
- EB and C
19Which of the following would be considered basic research?
- Atesting a safe, nontoxic mouse glue
- Btesting the strength of a mouse cage
- Cexamining how quickly a trapdoor closes
- Dexamining why a mouse likes cheddar cheese more than swiss cheese
- Estudying ways of catching mice safely
20Which of the following is a property of light?
- AIt is a particle.
- BIts energy comes in packets of uniform size.
- CIt is a wave.
- Dall of the above
- Enone of the above
21What do the electron configurations for all the group 18 noble gases have in common?
- AThey have the same number of electrons.
- BTheir outermost occupied shells are filled to capacity.
- CThey occupy the same number of shells.
- Dall of the above
22What is the name of the following compound?
CaCl2- Acalcium chloride
- Bdicalcium chloride
- Ccarbon chloride
- Ddichlorocalcium
- Ecalc two
23What do the components of a conceptual model have in common?
- AEach component must correlate with a corresponding component of a physical model.
- BAll components interact with each other.
- CThe components have nothing in common. This is what differentiates a conceptual model from a physical model.
- DAll components are mutually independent of each other.
24Which of the following could NOT be represented by a conceptual model?
- Athe energy of a nucleus
- Bthe floor plan of a house
- Cthe behavior of schoolchildren
- Dthe weather
- Eboth A and B
25Which of the following elements is a gas at room temperature
- Alead (Pb)
- Blithium (Li)
- Cargon (Ar)
- Dindium (In)
- Ecesium (Cs)
26A cat strolls across your backyard. An hour later, a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view.
- AThe dog is smelling molecules from the cat.
- BThe cat is leading the dog into a trap.
- CThe dog is smelling atoms from the cat
- DThe dog is following the areas of increased density of the Earth.
27Which of the following describes a nonmetal?
- Aductile
- Bmalleable
- Cgood conductor of heat
- Dpoor conductor of electricity
- Eshiny
28What is the name of the following compound?
SF3- Afluorine sulphide
- Btrifluorosulphide
- Csulfur trifluoride
- Dsulfur fluoride
- Enone of the above
29Should the periodic table be memorized? Why or why not?
- ANo. The periodic table changes every year. Memorizing it would be a waste of time.
- BYes. Without memorizing the periodic table, one would not have any real understanding of how and why chemical compounds are put together.
- CYes. Like the alphabet, we need to memorize the periodic table in order to easily write the language of chemistry.
- DNo. The periodic table is a reference to be used, not memorized.
30Which of the following can be classified as matter?
- Aperfume
- Bsand
- Cwater
- Dice cream
- EAll of the above
31How would you describe the volume of the following object?
the amount of water in a swimming pool- Amacroscopic
- Bmicroscopic
- Csubmicroscopic
- Dall of the above
- Enone of the above
32Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?
- AA
- BB
- CC
- DD
33The following image describes what type of change?
- Aa physical change
- Bno change
- Can elemental change
- Da chemical change
- Ea change in state
34Which of the following best explains what is happening when an atom emits light?
- AHeat energy is speeding up the orbit of the electrons and the resulting Doppler shift causes light to be emitted from the electrons.
- BAn electron is jumping from a low energy state to a high energy state with the difference in energy being converted to light.
- CHeat energy is converting a neutron into a proton and an electron, which is ejected into the orbit of the nucleus, releasing light energy.
- DAn electron is dropping from a higher to a lower energy level with the difference in energy between the two being emitted as light.
- EA proton is undergoing a nuclear change in the nucleus and is emitting a high energy light wave in the process.
35Which chemical family is composed almost entirely of man-made elements?
- Athe lanthanides
- Bthe actinides
- Cthe halogens
- Dall of the above
- Enone of the above
36The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron atom have?
- A24
- B54
- C26
- Dnone
37Which of the following would not be considered a chemical property?
- Awhether a material will dissolve in acid or not
- Bthe tendency of a material to explode
- Cthe temperature at which a liquid will boil
- Dwhether a metal will rust or not
- Elight sensitivity
38Elements that are in the same ________ have a tendency to have very similar chemical properties due to periodic trends.
- Acompound
- Bgroup
- Ctextbook
- Drow
- Eperiod
39Which of these properties describes a metal?
- Afragile
- Bbrittle
- Cdoesn't conduct electricity very well
- Dconducts heat very well
- Etransparent
40Which of the following statements describes an isotope?
- Aelement with the same number of protons but a different number of electrons
- Belement with the same number of neutrons but a different number of electrons
- Celement with the same number of protons but a different number of neutrons
- Delement with the same number of neutrons but a different number of protons
- Enone of the above
41Which of the following is not a chemical change?
- Aa loaf of bread growing mold
- Bgrass growing
- Ca rock being crushed to powder
- Dgrape juice turning into wine
- Ewood burning to ash
42Which of the following elements are in the same group as silicon (Si)?
- AB
- BP
- CC
- DAs
- Enone of the above
43The mass number of an element is ________.
- Athe sum of the isotopes
- Bthe sum of the electrons and the neutrons
- Cthe number of protons
- Dthe sum of the protons and the neutrons
- Ethe sum of the electrons and the protons
44Which atom is smallest?
- ABe
- BSr
- CCa
- DMg
- EAll are the same size.
45Which of the following is an example of a chemical change?
- Aa piece of metal expanding when heated, but returning to original size when cooled
- Baftershave or perfume on your skin generating a smell
- Cwater freezing into ice crystals
- Dgasoline being used in the engine of a car producing exhaust
- Ebreaking a glass window
46How many atoms of Oxygen (O) are in H3OClO4
- A2
- B3
- C1
- D7
- E5
47The following image describes which type of change?
- Aan elemental change
- Ba chemical change
- Cno change
- Da physical change
- Ea change in reactivity
48Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?
- Aa physical change
- Ba molecular change
- Ca chemical change
- Da decomposition
- Enone of the above
49Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties?
- AYes, but that their properties are similar is only a coincidence.
- BYes, and this explains how fish are able to breathe water.
- CNo, compounds are uniquely different from the elements from which they're made.
- DNo, but their similar properties are only a coincidence.
50Which of the following would not be considered a physical property?
- Atemperature at which a material melts
- Bcolor
- Ctemperature at which a material catches on fire
- Dconductivity
- Ehardness
51Which of the following would be considered applied research?
- Aexamining how susceptible a metal is to bending
- Bdetermining how readily a metal corrodes in a wet environment
- Cdetermining the lightest and strongest metal to be used for an airplane wing
- Ddetermining the melting temperature of a metal
- Etesting the strength of a piece of metal
52Which of the following statements best describes an element?
- Aa material that has consistent physical properties
- Ba material with more than one type of atom
- Ca material consisting of only one type of atom
- Da material that has consistent chemical properties
- Ematerial that is pure
53What is the name of the following compound?
NaF- Anatural fosfate
- Bnitrogen afleck
- Csodium fluoride
- Dsodium phosphide
- Enatrium fluoride
54Which of these does not describe a metal at room temperature?
- Abendable
- Bgas
- Csolid
- Dliquid
- Eshiny
55Which of the following physical properties would you expect for krypton (Kr)?
- Ashiny
- Bbrittle
- Cconducts electricity
- Da gas at room temperature
- Ehard
56Which of the following statements does not describe a proton?
- AIt orbits around the nucleus of an atom.
- BIt is a nucleon.
- CIt has a positive charge equivalent but opposite of an electron's.
- DIt is attracted to negatively charged electrical plates.
- EIt is much more massive than an electron.
57What is the main difference between a conceptual model and a physical model?
- APhysical models and conceptual models can be used to describe the same things.
- BPhysical models can only be used to represent the real world.
- CA physical model represents the shape and form while a conceptual model describes how a system behaves.
- DConceptual models can only be used to describe concepts.
- EA conceptual model represents the shape and form while a physical model describes how a system behaves.
58If you remove two protons and two neutrons from a gold atom (Au), what new element is formed (if any)?
- AAu-2
- BAu
- CRe
- DTl
- EIr
59The following image describes which type of change?
- Aan elemental change
- Ba chemical change
- Cno change
- Da physical change
- Ea change in reactivity
60How many atoms are in one molecule of Na2SO4?
- A4
- B7
- C24
- D2
- E3
61How is the term photon related to the term quantum?
- AA quantum is a wave of light while a packet of quanta equals one photon.
- BA quantum is a particle of light while a photon is a wave of light.
- CA quantum of light is actually one photon.
- DA quantum is a particle of light exactly one photon long.
- EA quantum of photons is equal to the wavelength.
62What was Niels Bohr's explanation for the observation of atomic spectra?
- ANucleons could be excited by different electron energies.
- BAny photon could excite an electron.
- COnly certain photons with the correct energy could excite the quanta in the nucleus.
- DElectrons could only move in discrete energy steps within an atom.
- EElectrons could not move in an atom.
63Which of the following elements will most likely be shiny and flexible?
- Aiodine (I)
- Bsilicon (Si)
- Crhodium (Rh)
- Dhydrogen (H)
- Ehelenium (Se)
64Why isn't dirt listed in the periodic table?
- AElements like dirt and air are so common that there is no need to list them in the periodic table.
- BDirt IS listed in the periodic table but is not easily recognized because it is listed as one of the rare earths with its old scientific name, dysprosium, symbol Dy.
- CThe periodic table lists only elements made of one kind of material. Dirt is a mixture of elements and compounds.
- DNone of the above is true.
65Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20). This fact relates to the organization of the periodic table in that strontium and calcium are both
- Ain group 2 of the periodic table.
- Bsoluble in water.
- Cmetals.
- Dmade of relatively large atoms.
66What is the name of the following compound?
CO2- Acarbon dioxide
- Bcalcium oxide
- Cdicobalt
- Dcalcium dioxide
- Edioxocarbon
67Which of the following is said to be quantized?
- Athe volume of air in a balloon
- Bthe amount of water in a glass
- Cthe amount of time in an hour
- Dthe number of eggs in an egg carton
- Enone of the above
68What is the valence shell?
- AIt is the shell of electrons in element V (atomic no. = 23)
- BIt is the last partially filled orbital in an atom.
- CIt is the shell of electrons in an atom that is the least reactive.
- DIt is the same as the orbital configuration.
- EIt is the outermost shell of electrons in an atom.
69Which contributes more to an atom's mass: electrons or protons? Which contributes more to an atom's size?
- AProtons contribute more to an atom's mass while electrons contribute more to its size.
- BProtons contribute more to both the mass and size of an atom.
- CElectrons contribute more to both the mass and size of an atom.
- DElectrons contribute more to an atom's mass while protons contribute more to its size.
70Which of the following is an example of a physical change?
- Acharcoal being converted into ash
- Ba candy bar being digested by a student
- Ciron metal reacting with oxygen to form rust
- Dwater boiling and being converted into steam
- Ewater being electrolyzed and being converted in hydrogen and oxygen
71Which are older, the atoms in the body of an elderly person or those in the body of a baby
- AIt depends upon their diet.
- BAn elderly person because they have been around much longer.
- CThey are of the same age, which is appreciably older than the solar system.
- DA baby because this is surely a trick question.
72Would you use a physical model or a conceptual model to describe the following: the brain; the mind; the solar system; the beginning of the universe?
- Aphysical; physical; physical; physical
- Bconceptual; conceptual; conceptual; conceptual
- Cphysical; conceptual; physical; conceptual
- Dconceptual; physical; conceptual physical
73The repeating trends that take place when examining the elements are called ________.
- Athe metal shift
- Ba group conscience
- Cperiodicity (periodic trend)
- Dthe family cycle
- Enone of the above
74Which of the following elements is an alkali metal?
- Acerium (Cr)
- Bargon (Ar)
- Clithium (Li)
- Dlead (Pb)
- Eindium (In)
75Which of the following boxes represents a compound?
- Aonly A
- Bonly B
- Conly C
- Dboth A and C
76Why are the atomic masses listed in the periodic table not whole numbers?
- AScientists have yet to make the precise measurements.
- BThe atomic masses are average atomic masses.
- CToday's instruments are able to measure the atomic masses to many decimal places.
- DThat would be too much of a coincidence.
77Which of the following would not be considered matter?
- Alight
- Bclouds
- Crain
- Dtrees
- Eair
78You could swallow a capsule of germanium, Ge (atomic number 32), without significant ill effects. If a proton were added to each germanium nucleus, however, you would not want to swallow the capsule because the germanium would
- Ahave a change in flavor.
- Bbecome radioactive.
- Cbecome arsenic.
- Dexpand and likely lodge in your throat.
79Which statement best describes a compound?
- Aa mixture of atoms
- Ba material that is made up of a combination of atoms bonded together
- Ca mixture of more than one element
- Da material that is made up of a single type of atom
- Enone of the above
80Which of the following is not the name of a chemical family?
- Aalkaline-earth metals
- Bnoble gases
- Cheavy metals
- Dtransition metals
- Ealkali metals
81Which of the following would be considered a physical property?
- Aflammability
- Bdensity
- Coxygen sensitivity
- Dreactivity towards acid
- Ecorrosion resistance
82What is the main tenet of Plank's quantum hypothesis?
- AEnergy can be converted into matter through nuclear quanta.
- BLight is composed of waves that exist only at certain quantum fundamental frequencies.
- CEnergy is composed of subatomic particles called quanta.
- DEnergy is a continuum, but light is quantized.
- EEnergy comes in discrete packets of a certain minimum size.
83Which of the following does not describe a neutron?
- AIt is more difficult to detect than a proton or an electron.
- BIt is a nucleon.
- CIt is often associated with protons.
- DIt has a positive charge equivalent but opposite of an electron's.
- EIt is much more massive than an electron.
84Which of the following could be represented by a physical model?
- Aa cell
- Ban atom
- Cecosystem
- Drationality
- Eboth A and B
85Since atoms are mostly empty space, why don't objects pass through one another?
- AThe nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier.
- BThe electrons on the atoms repel other electrons on other atoms when they get close.
- CThe nucleus of one atom repels the nucleus of another atom when it gets close.
- DThe electrons of one attract the nucleus of a neighboring atom to form a barrier.
86How is it possible to deduce the identity of an element from its electron configuration?
- AAn electron configuration is unique to each element, much like its atomic spectrum.
- BIf the atom is electrically neutral, the number of electrons corresponds to the atom's atomic number.
- CThe number of occupied shells corresponds to the atom's atomic number.
- DUsing the periodic table, the outermost occupied shell indicates the group while the number of occupied shells indicates the period.
87How would you describe the size of the following object?
a blood cell- Asubmicroscopic
- Bmicroscopic
- Cmacroscopic
- Dall of the above
- Enone of the above
88Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.
- AThe neutron is nearly massless.
- BThe discovery required the use of ultrafast computers.
- CThe neutron is only slightly more massive than the proton.
- DThe neutron lacks an electrical charge.
89Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20). This fact relates to the organization of the periodic table in that strontium and calcium are both
- Ain group 2 of the periodic table.
- Bsoluble in water.
- Cmetals.
- Dmade of relatively large atoms.
90Which element would have chemical properties the most similar to chlorine (Cl)?
- AAr
- BNa
- CBr
- DS
- EO
Información
- Descripción
- Conceptual physical Science
- Autor
- Kimberly Lopez
- Idioma
- English
- Visitas
- 620
- Etiquetas
- Valoración
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