Kimberly Lopez
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Conceptual physical Science

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Kimberly Lopez
Creado por Kimberly Lopez hace alrededor de 8 años
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Exam 1

Pregunta 1 de 90

1

An example of basic research

Selecciona una de las siguientes respuestas posibles:

  • the study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone.

  • the design of new batteries for electric cars.

  • the study of the composition of the atom.

  • the development of new plastics that can be recycled.

  • the study of natural compounds in sea animals to look for new molecules that can be used for medicine.

Explicación

Pregunta 2 de 90

1

Which element has the atomic number 12?

Selecciona una de las siguientes respuestas posibles:

  • Mg

  • Be

  • B

  • Na

  • C

Explicación

Pregunta 3 de 90

1

Would 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?

Selecciona una de las siguientes respuestas posibles:

  • You could adequately describe all of the topics by either model. The choice depends only on the characteristics requiring description.

  • physical model-gold coin, dollar bill, car engine; conceptual model-virus, air pollution, spread of sexually transmitted disease

  • conceptual model-gold coin, car engine, virus; physical model-air pollution, spread of sexually transmitted disease, dollar bill

  • physical 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.

Explicación

Pregunta 4 de 90

1

The following statement describes which subatomic particle best?

It is a nucleon.

Selecciona una de las siguientes respuestas posibles:

  • an electron

  • a proton

  • a neutron

  • A and B

  • B and C (a proton, a neutron)

Explicación

Pregunta 5 de 90

1

Which of the following elements are in the same period as magnesium (Mg)?

Selecciona una de las siguientes respuestas posibles:

  • Ca

  • Cl

  • Sr

  • Mn

  • none of the above

Explicación

Pregunta 6 de 90

1

What are metalloids?

Selecciona una de las siguientes respuestas posibles:

  • elements that have some properties like metals and some like nonmetals

  • elements that are smaller than metals

  • elements that have properties different than either the metals or the nonmetals

  • elements found in asteroids

  • elements that are larger than nonmetals

Explicación

Pregunta 7 de 90

1

Which of these is not a metal?

Selecciona una de las siguientes respuestas posibles:

  • lithium (atomic no. = 3)

  • vanadium (atomic no. = 23)

  • gallium (atomic no. = 31)

  • selenium (atomic no. = 34)

  • potassium (atomic no. = 19)

Explicación

Pregunta 8 de 90

1

If all the molecules of a body remained part of that body, would the body have any odor?

Selecciona una de las siguientes respuestas posibles:

  • No, because it would no longer be what it was

  • No, because there would be no molecules traveling to our nose.

  • Yes, but only if that body is sweating.

  • Yes, because it would still release photons.

Explicación

Pregunta 9 de 90

1

Which of the following elements is a transition metal?

Selecciona una de las siguientes respuestas posibles:

  • lead (Pb)

  • xenon (Xe)

  • silver (Ag)

  • lithium (Li)

  • chlorine (Cl)

Explicación

Pregunta 10 de 90

1

Which of the following statements about electrons is true?

Selecciona una de las siguientes respuestas posibles:

  • Electrons have a negative charge.

  • Electrons are particles.

  • Electrons in atoms can be excited by light energy.

  • Electrons behave like waves.

  • all of the above

Explicación

Pregunta 11 de 90

1

How many different elements are in the compound C6H12O6?

Selecciona una de las siguientes respuestas posibles:

  • 3

  • 24

  • 6

  • All of the elements are the same.

Explicación

Pregunta 12 de 90

1

Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder.

Selecciona una de las siguientes respuestas posibles:

  • physical; physical; chemical; physical

  • chemical; physical; chemical; chemical

  • chemical; physical; physical; physical

  • chemical; physical; chemical; physical

Explicación

Pregunta 13 de 90

1

How many electrons are there in the third shell of sodium, Na (atomic number 11)?

Selecciona una de las siguientes respuestas posibles:

  • none

  • one

  • two

  • three

Explicación

Pregunta 14 de 90

1

Which of the following would be considered a chemical property?

Selecciona una de las siguientes respuestas posibles:

  • melting temperature

  • reactivity towards water

  • boiling temperature

  • conductivity

  • flexibility

Explicación

Pregunta 15 de 90

1

Which of the following is not a nonmetal?

Selecciona una de las siguientes respuestas posibles:

  • sulfur (atomic no. = 16)

  • xenon (atomic no. = 54)

  • titanium (atomic no. = 22)

  • selenium (atomic no. = 34)

  • helium (atomic no. = 2)

Explicación

Pregunta 16 de 90

1

A 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?

Selecciona una de las siguientes respuestas posibles:

  • Neutrons carry no electric charge and thus have a greater likelihood of passing through the tissue.

  • Neutrons are much smaller and lighter than protons and would do less damage.

  • Neutrons travel at reduced speed compared to the speed at which protons travel.

  • All of the above are reasons why neutrons are less harmful.

Explicación

Pregunta 17 de 90

1

Which of the following statements is true about Bohr's planetary model of the atom?

Selecciona una de las siguientes respuestas posibles:

  • The electrons smoothly move from one orbit to the next.

  • It is a physical model.

  • The electrons orbit around the nucleus.

  • The energy difference between the orbits is continuous.

  • none of the above

Explicación

Pregunta 18 de 90

1

The following statement describes which subatomic particle best?

It is located outside of the nucleus.

Selecciona una de las siguientes respuestas posibles:

  • an electron

  • a proton

  • a neutron

  • A and B

  • B and C

Explicación

Pregunta 19 de 90

1

Which of the following would be considered basic research?

Selecciona una de las siguientes respuestas posibles:

  • testing a safe, nontoxic mouse glue

  • testing the strength of a mouse cage

  • examining how quickly a trapdoor closes

  • examining why a mouse likes cheddar cheese more than swiss cheese

  • studying ways of catching mice safely

Explicación

Pregunta 20 de 90

1

Which of the following is a property of light?

Selecciona una de las siguientes respuestas posibles:

  • It is a particle.

  • Its energy comes in packets of uniform size.

  • It is a wave.

  • all of the above

  • none of the above

Explicación

Pregunta 21 de 90

1

What do the electron configurations for all the group 18 noble gases have in common?

Selecciona una de las siguientes respuestas posibles:

  • They have the same number of electrons.

  • Their outermost occupied shells are filled to capacity.

  • They occupy the same number of shells.

  • all of the above

Explicación

Pregunta 22 de 90

1

What is the name of the following compound?
CaCl2

Selecciona una de las siguientes respuestas posibles:

  • calcium chloride

  • dicalcium chloride

  • carbon chloride

  • dichlorocalcium

  • calc two

Explicación

Pregunta 23 de 90

1

What do the components of a conceptual model have in common?

Selecciona una de las siguientes respuestas posibles:

  • Each component must correlate with a corresponding component of a physical model.

  • All components interact with each other.

  • The components have nothing in common. This is what differentiates a conceptual model from a physical model.

  • All components are mutually independent of each other.

Explicación

Pregunta 24 de 90

1

Which of the following could NOT be represented by a conceptual model?

Selecciona una de las siguientes respuestas posibles:

  • the energy of a nucleus

  • the floor plan of a house

  • the behavior of schoolchildren

  • the weather

  • both A and B

Explicación

Pregunta 25 de 90

1

Which of the following elements is a gas at room temperature

Selecciona una de las siguientes respuestas posibles:

  • lead (Pb)

  • lithium (Li)

  • argon (Ar)

  • indium (In)

  • cesium (Cs)

Explicación

Pregunta 26 de 90

1

A 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.

Selecciona una de las siguientes respuestas posibles:

  • The dog is smelling molecules from the cat.

  • The cat is leading the dog into a trap.

  • The dog is smelling atoms from the cat

  • The dog is following the areas of increased density of the Earth.

Explicación

Pregunta 27 de 90

1

Which of the following describes a nonmetal?

Selecciona una de las siguientes respuestas posibles:

  • ductile

  • malleable

  • good conductor of heat

  • poor conductor of electricity

  • shiny

Explicación

Pregunta 28 de 90

1

What is the name of the following compound?
SF3

Selecciona una de las siguientes respuestas posibles:

  • fluorine sulphide

  • trifluorosulphide

  • sulfur trifluoride

  • sulfur fluoride

  • none of the above

Explicación

Pregunta 29 de 90

1

Should the periodic table be memorized? Why or why not?

Selecciona una de las siguientes respuestas posibles:

  • No. The periodic table changes every year. Memorizing it would be a waste of time.

  • Yes. Without memorizing the periodic table, one would not have any real understanding of how and why chemical compounds are put together.

  • Yes. Like the alphabet, we need to memorize the periodic table in order to easily write the language of chemistry.

  • No. The periodic table is a reference to be used, not memorized.

Explicación

Pregunta 30 de 90

1

Which of the following can be classified as matter?

Selecciona una de las siguientes respuestas posibles:

  • perfume

  • sand

  • water

  • ice cream

  • All of the above

Explicación

Pregunta 31 de 90

1

How would you describe the volume of the following object?

the amount of water in a swimming pool

Selecciona una de las siguientes respuestas posibles:

  • macroscopic

  • microscopic

  • submicroscopic

  • all of the above

  • none of the above

Explicación

Pregunta 32 de 90

1

Which of the following diagrams best represents the size of the atomic nucleus relative to the size of the atom?

Selecciona una de las siguientes respuestas posibles:

  • A

  • B

  • C

  • D

Explicación

Pregunta 33 de 90

1

The following image describes what type of change?

Selecciona una de las siguientes respuestas posibles:

  • a physical change

  • no change

  • an elemental change

  • a chemical change

  • a change in state

Explicación

Pregunta 34 de 90

1

Which of the following best explains what is happening when an atom emits light?

Selecciona una de las siguientes respuestas posibles:

  • Heat energy is speeding up the orbit of the electrons and the resulting Doppler shift causes light to be emitted from the electrons.

  • An electron is jumping from a low energy state to a high energy state with the difference in energy being converted to light.

  • Heat energy is converting a neutron into a proton and an electron, which is ejected into the orbit of the nucleus, releasing light energy.

  • An electron is dropping from a higher to a lower energy level with the difference in energy between the two being emitted as light.

  • A proton is undergoing a nuclear change in the nucleus and is emitting a high energy light wave in the process.

Explicación

Pregunta 35 de 90

1

Which chemical family is composed almost entirely of man-made elements?

Selecciona una de las siguientes respuestas posibles:

  • the lanthanides

  • the actinides

  • the halogens

  • all of the above

  • none of the above

Explicación

Pregunta 36 de 90

1

The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron atom have?

Selecciona una de las siguientes respuestas posibles:

  • 24

  • 54

  • 26

  • none

Explicación

Pregunta 37 de 90

1

Which of the following would not be considered a chemical property?

Selecciona una de las siguientes respuestas posibles:

  • whether a material will dissolve in acid or not

  • the tendency of a material to explode

  • the temperature at which a liquid will boil

  • whether a metal will rust or not

  • light sensitivity

Explicación

Pregunta 38 de 90

1

Elements that are in the same ________ have a tendency to have very similar chemical properties due to periodic trends.

Selecciona una de las siguientes respuestas posibles:

  • compound

  • group

  • textbook

  • row

  • period

Explicación

Pregunta 39 de 90

1

Which of these properties describes a metal?

Selecciona una de las siguientes respuestas posibles:

  • fragile

  • brittle

  • doesn't conduct electricity very well

  • conducts heat very well

  • transparent

Explicación

Pregunta 40 de 90

1

Which of the following statements describes an isotope?

Selecciona una de las siguientes respuestas posibles:

  • element with the same number of protons but a different number of electrons

  • element with the same number of neutrons but a different number of electrons

  • element with the same number of protons but a different number of neutrons

  • element with the same number of neutrons but a different number of protons

  • none of the above

Explicación

Pregunta 41 de 90

1

Which of the following is not a chemical change?

Selecciona una de las siguientes respuestas posibles:

  • a loaf of bread growing mold

  • grass growing

  • a rock being crushed to powder

  • grape juice turning into wine

  • wood burning to ash

Explicación

Pregunta 42 de 90

1

Which of the following elements are in the same group as silicon (Si)?

Selecciona una de las siguientes respuestas posibles:

  • B

  • P

  • C

  • As

  • none of the above

Explicación

Pregunta 43 de 90

1

The mass number of an element is ________.

Selecciona una de las siguientes respuestas posibles:

  • the sum of the isotopes

  • the sum of the electrons and the neutrons

  • the number of protons

  • the sum of the protons and the neutrons

  • the sum of the electrons and the protons

Explicación

Pregunta 44 de 90

1

Which atom is smallest?

Selecciona una de las siguientes respuestas posibles:

  • Be

  • Sr

  • Ca

  • Mg

  • All are the same size.

Explicación

Pregunta 45 de 90

1

Which of the following is an example of a chemical change?

Selecciona una de las siguientes respuestas posibles:

  • a piece of metal expanding when heated, but returning to original size when cooled

  • aftershave or perfume on your skin generating a smell

  • water freezing into ice crystals

  • gasoline being used in the engine of a car producing exhaust

  • breaking a glass window

Explicación

Pregunta 46 de 90

1

How many atoms of Oxygen (O) are in H3OClO4

Selecciona una de las siguientes respuestas posibles:

  • 2

  • 3

  • 1

  • 7

  • 5

Explicación

Pregunta 47 de 90

1

The following image describes which type of change?

Selecciona una de las siguientes respuestas posibles:

  • an elemental change

  • a chemical change

  • no change

  • a physical change

  • a change in reactivity

Explicación

Pregunta 48 de 90

1

Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?

Selecciona una de las siguientes respuestas posibles:

  • a physical change

  • a molecular change

  • a chemical change

  • a decomposition

  • none of the above

Explicación

Pregunta 49 de 90

1

Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties?

Selecciona una de las siguientes respuestas posibles:

  • Yes, but that their properties are similar is only a coincidence.

  • Yes, and this explains how fish are able to breathe water.

  • No, compounds are uniquely different from the elements from which they're made.

  • No, but their similar properties are only a coincidence.

Explicación

Pregunta 50 de 90

1

Which of the following would not be considered a physical property?

Selecciona una de las siguientes respuestas posibles:

  • temperature at which a material melts

  • color

  • temperature at which a material catches on fire

  • conductivity

  • hardness

Explicación

Pregunta 51 de 90

1

Which of the following would be considered applied research?

Selecciona una de las siguientes respuestas posibles:

  • examining how susceptible a metal is to bending

  • determining how readily a metal corrodes in a wet environment

  • determining the lightest and strongest metal to be used for an airplane wing

  • determining the melting temperature of a metal

  • testing the strength of a piece of metal

Explicación

Pregunta 52 de 90

1

Which of the following statements best describes an element?

Selecciona una de las siguientes respuestas posibles:

  • a material that has consistent physical properties

  • a material with more than one type of atom

  • a material consisting of only one type of atom

  • a material that has consistent chemical properties

  • material that is pure

Explicación

Pregunta 53 de 90

1

What is the name of the following compound?
NaF

Selecciona una de las siguientes respuestas posibles:

  • natural fosfate

  • nitrogen afleck

  • sodium fluoride

  • sodium phosphide

  • natrium fluoride

Explicación

Pregunta 54 de 90

1

Which of these does not describe a metal at room temperature?

Selecciona una de las siguientes respuestas posibles:

  • bendable

  • gas

  • solid

  • liquid

  • shiny

Explicación

Pregunta 55 de 90

1

Which of the following physical properties would you expect for krypton (Kr)?

Selecciona una de las siguientes respuestas posibles:

  • shiny

  • brittle

  • conducts electricity

  • a gas at room temperature

  • hard

Explicación

Pregunta 56 de 90

1

Which of the following statements does not describe a proton?

Selecciona una de las siguientes respuestas posibles:

  • It orbits around the nucleus of an atom.

  • It is a nucleon.

  • It has a positive charge equivalent but opposite of an electron's.

  • It is attracted to negatively charged electrical plates.

  • It is much more massive than an electron.

Explicación

Pregunta 57 de 90

1

What is the main difference between a conceptual model and a physical model?

Selecciona una de las siguientes respuestas posibles:

  • Physical models and conceptual models can be used to describe the same things.

  • Physical models can only be used to represent the real world.

  • A physical model represents the shape and form while a conceptual model describes how a system behaves.

  • Conceptual models can only be used to describe concepts.

  • A conceptual model represents the shape and form while a physical model describes how a system behaves.

Explicación

Pregunta 58 de 90

1

If you remove two protons and two neutrons from a gold atom (Au), what new element is formed (if any)?

Selecciona una de las siguientes respuestas posibles:

  • Au-2

  • Au

  • Re

  • Tl

  • Ir

Explicación

Pregunta 59 de 90

1

The following image describes which type of change?

Selecciona una de las siguientes respuestas posibles:

  • an elemental change

  • a chemical change

  • no change

  • a physical change

  • a change in reactivity

Explicación

Pregunta 60 de 90

1

How many atoms are in one molecule of Na2SO4?

Selecciona una de las siguientes respuestas posibles:

  • 4

  • 7

  • 24

  • 2

  • 3

Explicación

Pregunta 61 de 90

1

How is the term photon related to the term quantum?

Selecciona una de las siguientes respuestas posibles:

  • A quantum is a wave of light while a packet of quanta equals one photon.

  • A quantum is a particle of light while a photon is a wave of light.

  • A quantum of light is actually one photon.

  • A quantum is a particle of light exactly one photon long.

  • A quantum of photons is equal to the wavelength.

Explicación

Pregunta 62 de 90

1

What was Niels Bohr's explanation for the observation of atomic spectra?

Selecciona una de las siguientes respuestas posibles:

  • Nucleons could be excited by different electron energies.

  • Any photon could excite an electron.

  • Only certain photons with the correct energy could excite the quanta in the nucleus.

  • Electrons could only move in discrete energy steps within an atom.

  • Electrons could not move in an atom.

Explicación

Pregunta 63 de 90

1

Which of the following elements will most likely be shiny and flexible?

Selecciona una de las siguientes respuestas posibles:

  • iodine (I)

  • silicon (Si)

  • rhodium (Rh)

  • hydrogen (H)

  • helenium (Se)

Explicación

Pregunta 64 de 90

1

Why isn't dirt listed in the periodic table?

Selecciona una de las siguientes respuestas posibles:

  • Elements like dirt and air are so common that there is no need to list them in the periodic table.

  • Dirt 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.

  • The periodic table lists only elements made of one kind of material. Dirt is a mixture of elements and compounds.

  • None of the above is true.

Explicación

Pregunta 65 de 90

1

Strontium, 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

Selecciona una de las siguientes respuestas posibles:

  • in group 2 of the periodic table.

  • soluble in water.

  • metals.

  • made of relatively large atoms.

Explicación

Pregunta 66 de 90

1

What is the name of the following compound?
CO2

Selecciona una de las siguientes respuestas posibles:

  • carbon dioxide

  • calcium oxide

  • dicobalt

  • calcium dioxide

  • dioxocarbon

Explicación

Pregunta 67 de 90

1

Which of the following is said to be quantized?

Selecciona una de las siguientes respuestas posibles:

  • the volume of air in a balloon

  • the amount of water in a glass

  • the amount of time in an hour

  • the number of eggs in an egg carton

  • none of the above

Explicación

Pregunta 68 de 90

1

What is the valence shell?

Selecciona una de las siguientes respuestas posibles:

  • It is the shell of electrons in element V (atomic no. = 23)

  • It is the last partially filled orbital in an atom.

  • It is the shell of electrons in an atom that is the least reactive.

  • It is the same as the orbital configuration.

  • It is the outermost shell of electrons in an atom.

Explicación

Pregunta 69 de 90

1

Which contributes more to an atom's mass: electrons or protons? Which contributes more to an atom's size?

Selecciona una de las siguientes respuestas posibles:

  • Protons contribute more to an atom's mass while electrons contribute more to its size.

  • Protons contribute more to both the mass and size of an atom.

  • Electrons contribute more to both the mass and size of an atom.

  • Electrons contribute more to an atom's mass while protons contribute more to its size.

Explicación

Pregunta 70 de 90

1

Which of the following is an example of a physical change?

Selecciona una de las siguientes respuestas posibles:

  • charcoal being converted into ash

  • a candy bar being digested by a student

  • iron metal reacting with oxygen to form rust

  • water boiling and being converted into steam

  • water being electrolyzed and being converted in hydrogen and oxygen

Explicación

Pregunta 71 de 90

1

Which are older, the atoms in the body of an elderly person or those in the body of a baby

Selecciona una de las siguientes respuestas posibles:

  • It depends upon their diet.

  • An elderly person because they have been around much longer.

  • They are of the same age, which is appreciably older than the solar system.

  • A baby because this is surely a trick question.

Explicación

Pregunta 72 de 90

1

Would 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?

Selecciona una de las siguientes respuestas posibles:

  • physical; physical; physical; physical

  • conceptual; conceptual; conceptual; conceptual

  • physical; conceptual; physical; conceptual

  • conceptual; physical; conceptual physical

Explicación

Pregunta 73 de 90

1

The repeating trends that take place when examining the elements are called ________.

Selecciona una de las siguientes respuestas posibles:

  • the metal shift

  • a group conscience

  • periodicity (periodic trend)

  • the family cycle

  • none of the above

Explicación

Pregunta 74 de 90

1

Which of the following elements is an alkali metal?

Selecciona una de las siguientes respuestas posibles:

  • cerium (Cr)

  • argon (Ar)

  • lithium (Li)

  • lead (Pb)

  • indium (In)

Explicación

Pregunta 75 de 90

1

Which of the following boxes represents a compound?

Selecciona una de las siguientes respuestas posibles:

  • only A

  • only B

  • only C

  • both A and C

Explicación

Pregunta 76 de 90

1

Why are the atomic masses listed in the periodic table not whole numbers?

Selecciona una de las siguientes respuestas posibles:

  • Scientists have yet to make the precise measurements.

  • The atomic masses are average atomic masses.

  • Today's instruments are able to measure the atomic masses to many decimal places.

  • That would be too much of a coincidence.

Explicación

Pregunta 77 de 90

1

Which of the following would not be considered matter?

Selecciona una de las siguientes respuestas posibles:

  • light

  • clouds

  • rain

  • trees

  • air

Explicación

Pregunta 78 de 90

1

You 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

Selecciona una de las siguientes respuestas posibles:

  • have a change in flavor.

  • become radioactive.

  • become arsenic.

  • expand and likely lodge in your throat.

Explicación

Pregunta 79 de 90

1

Which statement best describes a compound?

Selecciona una de las siguientes respuestas posibles:

  • a mixture of atoms

  • a material that is made up of a combination of atoms bonded together

  • a mixture of more than one element

  • a material that is made up of a single type of atom

  • none of the above

Explicación

Pregunta 80 de 90

1

Which of the following is not the name of a chemical family?

Selecciona una de las siguientes respuestas posibles:

  • alkaline-earth metals

  • noble gases

  • heavy metals

  • transition metals

  • alkali metals

Explicación

Pregunta 81 de 90

1

Which of the following would be considered a physical property?

Selecciona una de las siguientes respuestas posibles:

  • flammability

  • density

  • oxygen sensitivity

  • reactivity towards acid

  • corrosion resistance

Explicación

Pregunta 82 de 90

1

What is the main tenet of Plank's quantum hypothesis?

Selecciona una de las siguientes respuestas posibles:

  • Energy can be converted into matter through nuclear quanta.

  • Light is composed of waves that exist only at certain quantum fundamental frequencies.

  • Energy is composed of subatomic particles called quanta.

  • Energy is a continuum, but light is quantized.

  • Energy comes in discrete packets of a certain minimum size.

Explicación

Pregunta 83 de 90

1

Which of the following does not describe a neutron?

Selecciona una de las siguientes respuestas posibles:

  • It is more difficult to detect than a proton or an electron.

  • It is a nucleon.

  • It is often associated with protons.

  • It has a positive charge equivalent but opposite of an electron's.

  • It is much more massive than an electron.

Explicación

Pregunta 84 de 90

1

Which of the following could be represented by a physical model?

Selecciona una de las siguientes respuestas posibles:

  • a cell

  • an atom

  • ecosystem

  • rationality

  • both A and B

Explicación

Pregunta 85 de 90

1

Since atoms are mostly empty space, why don't objects pass through one another?

Selecciona una de las siguientes respuestas posibles:

  • The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier.

  • The electrons on the atoms repel other electrons on other atoms when they get close.

  • The nucleus of one atom repels the nucleus of another atom when it gets close.

  • The electrons of one attract the nucleus of a neighboring atom to form a barrier.

Explicación

Pregunta 86 de 90

1

How is it possible to deduce the identity of an element from its electron configuration?

Selecciona una de las siguientes respuestas posibles:

  • An electron configuration is unique to each element, much like its atomic spectrum.

  • If the atom is electrically neutral, the number of electrons corresponds to the atom's atomic number.

  • The number of occupied shells corresponds to the atom's atomic number.

  • Using the periodic table, the outermost occupied shell indicates the group while the number of occupied shells indicates the period.

Explicación

Pregunta 87 de 90

1

How would you describe the size of the following object?

a blood cell

Selecciona una de las siguientes respuestas posibles:

  • submicroscopic

  • microscopic

  • macroscopic

  • all of the above

  • none of the above

Explicación

Pregunta 88 de 90

1

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.

Selecciona una de las siguientes respuestas posibles:

  • The neutron is nearly massless.

  • The discovery required the use of ultrafast computers.

  • The neutron is only slightly more massive than the proton.

  • The neutron lacks an electrical charge.

Explicación

Pregunta 89 de 90

1

Strontium, 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

Selecciona una de las siguientes respuestas posibles:

  • in group 2 of the periodic table.

  • soluble in water.

  • metals.

  • made of relatively large atoms.

Explicación

Pregunta 90 de 90

1

Which element would have chemical properties the most similar to chlorine (Cl)?

Selecciona una de las siguientes respuestas posibles:

  • Ar

  • Na

  • Br

  • S

  • O

Explicación

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