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Exam 2
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Perguntas do quiz (94)
1What is the valence shell?
- AIt is the shell of electrons in element V (atomic no. = 23)
- BIt is the shell of electrons in an atom that is the least reactive.
- CIt is the outermost shell of electrons in an atom.
- DIt is the same as the orbital configuration
- EIt is the last partially filled orbital in an atom.
2Which of the following best describes ionic bonding?
- Atwo atoms exchanging a set of electrons
- Btwo atoms sharing a set of electrons
- Cone atom giving up some of its electrons to another atom
- Dwhen two elements with same charge are held together by electrostatic forces
- Enone of the above
3How many valence electrons does bromine (Br, atomic no. = 35) have?
- A28
- B7
- C21
- D1
- E35
4The source of an atom's electronegativity is the
- Akinetic energy electrons have orbiting the nucleus.
- Brepulsive force occurring among electrons within the same shell.
- Crepulsive force occurring between electrons within neighboring shells.
- Dpositively charged atomic nucleus.
5Metals are often used for making designer jewelry because they
- Aconduct electricity
- Bdo not conduct heat well
- Care shiny
- Dare strong but can be bent
- Ec and d (are shiny, are strong but can be bent)
6Which of the following is the main form of intermolecular attractions among water molecules?
- Ahydrogen bonding
- Binduced dipole-induced dipole
- Cpolar-induced polar
- Dion-dipole
- Ecovalent bonding
7If a neutral atom gains two electrons, what is the electrical charge of the atom?
- A+1
- B+2
- Cneutral
- D-1
- E-2
8What is the difference between a dipole-dipole interaction and an ion-dipole interaction?
- Aone involves hydrogen bonding while the other does not
- Bone involves dipole attraction between neutral molecules while the other involves dipole interactions with ions
- Cone involves salts and water while the other doesn't involve water
- Done involves ionic molecules interacting with other ionic molecules while the other deals with polar molecules
- Enone of the above
9How is it possible for a neutral molecule, such as water, to form an ion?
- AIt can fragment into protons and electrons.
- BIt can combine with a chloride ion to form a negatively charged species.
- CIt can absorb electrons and become negatively charged.
- DIt can combine with a hydrogen ion to form a positively charged species.
- EIt can absorb electrons and become positively charged.
10How do the electron-dot structures of elements in the same group in the periodic table compare with one another?
- AThe number of electrons in the electron-dot-structure will equal the group number for each element of the group.
- BThe structures differ by exactly two electrons between vertically consecutive elements.
- CElements of the same group have the same number of valence electrons.
- DThe number of valence shell electrons increases by one for each element from the top to the bottom of the group.
11Which of the following elements will most likely form an ion with a -2 charge?
- AMg
- BS
- CCl
- DNe
- ENa
12Many of the macroscopic properties of a compound depend on ________.
- Athe mass of the constituent atoms
- Bhow the atoms of the molecules are held together
- Cthe number of nucleons present in the sample
- Dthe size of the sample
- Ehow the atoms absorb light and the shape of the orbitals
13Which of the following statements describes a polar molecule?
- AThe molecules are usually not attracted to one another very strongly.
- BPolar molecules have the weakest intermolecular interactions with ionic compounds.
- CThe electrons in the molecule are distributed evenly throughout the molecule.
- DThe molecules have a high degree of symmetry.
- ENone of these statements describe polar molecules.
14Metals are useful for the structural support of buildings because they
- Ado not conduct heat well
- Bare strong but can be bent
- Cconduct electricity
- Dare shiny
- Ec and d
15Which of the following statements best describes a relatively polar bond?
- Aa very electronegative atom and a weakly electronegative atom are covalently bound
- Btwo very electronegative atoms undergo ionic bonding
- Ctwo very electronegative atoms are covalently bound
- Dtwo weakly electronegative atoms undergo ionic bonding
- Enone of the above
16What property of metal atoms account for many of the observed bulk phenomena seen in metal samples?
- AMetals readily form covalent bonds.
- BMetal atoms easily lose one or more outer electrons.
- CMetals readily form ionic bonds.
- DMetal atoms easily gain one or more outer electrons.
- Enone of the above
17Which of the following is NOT an ion?
- AMg+2
- BNO3-
- CH+1
- DO2
- EBr-
18If a neutral atom loses one electron, what is the electrical charge of the atom?
- A+2
- B-2
- C+1
- D-1
- Eneutral
19How many more electrons can fit within the valence shell of a hydrogen atom?
- A7
- B2
- C0
- D1
20What is the main difference between a dipole-dipole interaction and a dipole-induced dipole interaction?
- ADipole-induced dipole interactions are stronger because the induced dipoles can be formed at any time.
- BDipole-dipole interactions are weaker because the dipoles are permanent.
- CBoth are similar, but one involves a temporary dipole created by a permanent dipole.
- DBoth are identical.
- Enone of the above
21Distinguish between a metal and a metal-containing compound.
- AOnly one of these contains ionic bonds.
- BOnly one of these contains covalent bonds.
- CThere is no distinction between the two.
- DOnly one of these occurs naturally.
22Which of the following describes how a metal atoms behaves in a bulk metallic object?
- AThe metal atoms have limited interaction with neighboring atoms.
- BThe metal atom shares its electrons in a very directional manner.
- CThe metal atom shares its electrons with only one other atom.
- DThe metal ion shares its outermost electrons freely with its neighbors.
- Enone of the above
23How is the number of unpaired valence electrons in an atom related to the number of bonds that the atom can form?
- AThere is no defined relationship between the number of unpaired valence electrons and number of bonds that the atom can form.
- BThe number of unpaired valence electrons in an atom is the same as the number of bonds that the atom can form.
- CThe number of unpaired valence electrons in an atom is twice the number of bonds that the atom can form.
- DThe number of unpaired valence electrons in an atom is one-half the number of bonds that the atom can form.
24Which of the following does not describe ionic compounds?
- AThey have a tendency to melt easily.
- BThey are usually very ordered.
- CThey consist of positive and negative ions.
- DThey are held together by electrostatic attraction.
- Enone of the above
25Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. How is this possible?
- AAn ionic bond results when a nonmetallic elements gains an electron from a metallic element.
- BThis happens when one of the bonded nonmetallic elements has a strong electronegativity.
- CIt happens when one of the nonmetallic elements loses an electron to become a positive ion.
- DAn ionic bond results when a nonmetallic elements loses an electron to a metallic element.
26In a solution of 77 percent nitrogen and 23 percent oxygen, which is the solvent?
- Anitrogen
- Boxygen
- Cboth
- Dneither
- Egases cannot form solutions
27If you filter sea water to remove all of the particles you would be left with a clear ________.
- Ahomogeneous mixture called a suspension
- Bheterogeneous mixture called a solution
- Cheterogeneous mixture called a suspension
- Dpure liquid
- Ehomogeneous mixture called a solution
28How would you classify the following material?
milk- Aa solution
- Ba compound
- Ca suspension
- Dan element
- Ea heterogeneous mixture
29The following image represents which kind of matter?
- Aa compound
- Ban element
- Ca mixture
- Dnone of the above
- Eall of the above
30Which of the following accurately describes osmosis?
- AThe less concentrated solution gets more dilute.
- BThe more concentrated solution absorbs water from the less concentrated solution.
- CThe less concentrated solution absorbs water from the more concentrated solution.
- DThe ions migrate from the more concentrated solution to the less concentrated.
- Enone of the above
31What is the difference between a compound and a mixture?
- AThe components of a mixture do not have the same properties individually as they do when mixed.
- BA compound can be physically separated into its components; a mixture cannot be physically separated into its components.
- CA compound is just a mixture of elements.
- DA mixture can be physically separated into its components; a compound cannot be physically separated into its components.
- EThe components of a compound have the same properties individually as they do when mixed.
32A combination of two or more substances in which they no longer retain their chemical properties is called a(n) ________.
- Acompound
- Bheterogeneous mixture
- Cperiodic trend
- Dsuspension
- Emixture
33What is the difference between a compound and a mixture?
- AThe components of a mixture are not chemically bonded together.
- BThey both consist of atoms from different elements.
- CThe way in which their atoms are bonded together.
- DOne is a solid and the other is a liquid.
34Which of the following solutions is the most concentrated?
- Aone liter of water with 5 grams of sugar
- Bone liter of water with 10 grams of sugar
- Cone liter of water with 1 gram of sugar
- Done liter of water with 2 grams of sugar
- EThey all have the same volume
35What is the purpose of treating water with chlorine gas or ozone during water purification?
- Ato improve taste
- Bto kill bacteria
- Cto improve color
- Dto remove solids
- Enone of the above
36How would you classify the following material?
coffee (black)- Aan element
- Ba solution
- Ca heterogeneous mixture
- Da compound
- Ea suspension
37In a solution made from one teaspoon of sugar and one liter of water, which is the solute?
- Asugar
- Bthe teaspoon
- Cwater
- Dboth sugar and water
- Enone of the above
38Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components. Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components?
- AThe chemical properties of the components of a mixture are too different from each other.
- BThe chemical properties of the components of a mixture are too similar to each other.
- CA chemical property involves a chemical change so that you no longer have what you had.
- DChemical properties are not as apparent as are physical properties.
39How would you classify the following material?
coffee (with milk)- Aan element
- Ba compound
- Ca suspension
- Da heterogeneous mixture
- Ea solution
40Which of the following is not a typical use for potable water?
- Acooking in a pot
- Bflushing a toilet
- Cboiling
- Dirrigation
- Edrinking
41Which has the most atoms?
- Aa mole of helium
- Ba mole of gold
- Ca mole of lead
- DAll of the above have the same number of atoms.
- Enone of the above
42When blue food coloring is stirred into water, the result is a ________.
- Ahomogeneous mixture called a suspension
- Bheterogeneous mixture called a suspension
- Cheterogeneous mixture called a solution
- Dpure liquid
- Ehomogeneous mixture called a solution
43Which of the following solutions is the most concentrated?
- A0.1 liter of water with 1 gram of sugar
- B0.5 liter of water with 50 grams of sugar
- C2 liters of water with 0.2 gram of sugar
- D3 liters of water with 30 grams of sugar
- EThey all have the same concentration.
44How might you separate a mixture of sand and salt?
- Ajust add water
- Bwith tweezers and a magnifying glass
- Cheat the mixture until one of the components melts
- DTwo of the above answers are reasonable.
45How would you classify the following material?
a cappuccino (with foam)- Aa solution
- Ba heterogeneous mixture
- Ca suspension
- Da compound
- Ean element
46Why can't the elements of a compound be separated from one another by physical means?
- AElements found within a compound tend to be inert.
- BThey are too homogeneous when found within a compound.
- CElements tend not to be soluble in water.
- DTheir atoms are too tightly bound to one another.
47Why is secondary treatment often needed for sewage?
- AThe solution is contaminated with dangerous bacteria.
- BThe dissolved organics are too high and lead to bacterial growth.
- CThere are too many finely divided particles that need to be filtered.
- DThere are too many dissolved inorganic compounds.
- Enone of the above
48What do chicken noodle soup and garden soil have in common?
- AThey are both examples of compounds.
- BThey both contain elements.
- CThey are both examples of heterogeneous mixtures.
- Dnothing
49Which of the following statements about sewage is not true?
- ATreated sewage becomes drinking water downstream.
- BAll municipalities must treat sewage the same way.
- CAll municipalities must treat sewage.
- DOnce treated, sewage is released to the environment.
- ENone of the above are true.
50How is the solubility of a solid affected by temperature?
- AAs temperature goes up, the solubility goes up.
- BAs temperature goes down, the solubility goes down.
- CAs temperature goes down, the solubility goes up.
- DAs temperature goes up, the solubility goes down.
- Eboth A and B : (As temperature goes up, the solubility goes up. As temperature goes down, the solubility goes down.)
51Which of the following elements has six valence electrons?
- ABe
- BB
- CN
- DC
- EO
52Which of the following molecules contains a polar bond?
- AF-F
- BCl-Cl
- CH-H
- DH-F
- Eall of the above
53If you mix a typical aluminum ion (Al, atomic no. = 13) with a typical oxygen ion (O, atomic no. = 8), what compound is formed?
- AAl2O3
- BAl13O8
- CAl3O2
- DAl3O
- EAl2O2
54How many valence electrons does gallium (Ga, atomic no. = 31) have?
- A1
- B31
- C3
- D6
- E70
55Which of the following elements will most likely form an ion with a -1 charge?
- ANe
- BCl
- CS
- DNa
- EMg
56Which of the following compounds has polar covalent bonds?
- ACsF2
- BS8
- CCH4
- DH2O
- ENe
57What it the main difference between an ionic and a covalent bond?
- AOne involves electrons, the other does not involve any electrons.
- BBoth bonds are the same, but named different to describe different atoms involved.
- COne is the sharing of a pair of electrons, the other is the transfer of at least one electron.
- DThe electrons are traded between the two atoms and this keeps the atoms close.
58If you mix a typical iodine ion (I, atomic no. = 53) with a typical barium ion (Ba, atomic no. = 56), what compound is formed?
- ABaI
- BBa56I53
- CBa2I2
- DBaI2
- EBa2I
59Barium ions carry a 2+ charge, and nitrogen ions carry a 3-charge. What would be the chemical formula for the ionic compound barium nitride?
- ABa3N4
- BBa3N2
- CBa2N2
- DBa2N3
60What does the line in the following example actually represent?
H—H- Aa shared pair of electrons
- Ba covalent bond
- Can ionic bond
- Da pair of nonbonding electrons
- EA and B: a shared pair of electrons, a covalent bond
61Does an ionic bond have a dipole?
- ANo, dipoles are only found in covalent compounds.
- BYes, the ionic bond is an example of a very strong dipole.
- CNo, but the electrical charges are relatively strong.
- DYes, but for ionic compounds they are referred to as monopoles.
62The concept of a chemical bond is ________.
- Ahow two or more electrons reside in an orbital
- Bthe sharing of nucleons
- Chow two or more atoms are held together
- Dhow much energy it takes to remove an electron from a set of atoms
- Enone of the above
63What is one role of unpaired valance electrons?
- AThey are the nonbonding electrons.
- BThey tell us which Lewis dot structure is correct.
- CThey take part in the formation of different types of bonds.
- DThey keep the paired electrons separated to minimize interaction.
- EThey provide the number of Lewis dots.
64What is a molecule?
- Agroup of covalent compounds held together by ionic bonds
- Bpair of shared valence electrons
- Ca group of atoms that are held together by ionic bonds
- Da group of atoms that are held together by covalent bonds
- Epair of atoms sharing a set of valence electron
65In terms of the periodic table, is there an abrupt or gradual change between ionic and covalent bonds?
- AThere is a gradual change: the farther apart, the more ionic.
- BThere is an abrupt change that occurs across the metalloids
- CWhether an element forms one or the other depends on nuclear charge and not the relative positions in the periodic table.
- DActually, any element of the periodic table can form a covalent bond.
66What is the difference between a dipole-dipole interaction and an ion-dipole interaction?
- Aone involves hydrogen bonding while the other does not
- Bone involves dipole attraction between neutral molecules while the other involves dipole interactions with ions
- Cone involves salts and water while the other doesn't involve water
- Done involves ionic molecules interacting with other ionic molecules while the other deals with polar molecules
- Enone of the above
67How is the solubility of a solid affected by temperature?
- AAs temperature goes up, the solubility goes up.
- BAs temperature goes down, the solubility goes down.
- CAs temperature goes down, the solubility goes up.
- DAs temperature goes up, the solubility goes down.
- Eboth A and B (As temperature goes up, the solubility goes up. As temperature goes down, the solubility goes down.)
68What is the first step in treating raw sewage?
- Aremoval of sludge
- Bremoval of grit by settling
- Cfiltration of solids
- Ddisinfection
- Eremoval of fine particles by settling
69What statement best describes a mole?
- AIt is a very large number chemists use to count atoms or molecules.
- Bthe amount of molecules or atoms in 1 gram of something
- Ca very small number chemists use to count atoms or molecules
- Da little furry mammal that lives in the ground
- Enone of the above
70Which of the following would be considered a homogeneous mixture?
- Ahydrogen cyanide
- Bwine
- Cpretzel
- Drusty iron
- Esugar
71Which of the following solutions is the most dilute?
- Aone liter of water with 10 grams of sugar
- Bone liter of water with 5 grams of sugar
- Cone liter of water with 2 grams of sugar
- Done liter of water with 1 gram of sugar
- EThey all have the same volume.
72Which of the following is a pure substance?
- Asalt water
- Borange juice
- Cbaking soda
- Dduct tape
- Ecooking oil
73The following image represents which kind of matter?
- Aa compound
- Ban element
- Ca mixture
- Dnone of the above
- Eall of the above
74A sample of steel is composed of 5 percent carbon and 95 percent iron. Which is the solvent?
- Acarbon
- Biron
- Csteel
- DSteel is not a solution, it is a mixture.
- EA solid cannot be a solvent.
75Which of the following material phases cannot form a solution?
- Asolids
- Bgases
- Cliquids
- DAll of the above can form solutions.
- ENone of the above can form solutions.
76How does a suspension differ from a solution?
- AA suspension is a heterogeneous mixture consisting of different phases whereas a solution is a homogeneous mixture consisting of a single phase.
- BThe difference between a suspension and a solution can only be determined by chemical means.
- CA suspension is a heterogeneous mixture whose components can be separated by simple filtration. A solution is a homogeneous mixture which cannot be separated by simple filtration.
- DAlthough a solution and suspension are both homogeneous mixtures, only the components of a suspension will separate by spinning the mixture in a centrifuge.
77How would you classify the following material?
swimming pool water- Aheterogeneous mixture
- Ba pure element
- Ca pure compound
- Dhomogeneous mixture
- Edepends on how many children have been in it
78Which of the following bonds would be the most polar?
- AC-Cl
- BC-Br
- CC-F
- DC-I
- EAll are equally polar.
79Which of the following bonds would be the least polar?
- AC-H
- BC-F
- CC-O
- DC-Cl
- EAll are equally polar.
80Which of the following elements will most likely not form an ion at all?
- ANa
- BMg
- CBr
- DO
- EAr
81Which of the following is the weakest?
- AA dipole-induced dipole attraction
- BA dipole-dipole attraction
- CAn induced dipole-induced dipole attraction
- DAn ion-dipole attraction
- EA chemical bond
82Which of the following compounds contains ionic bonds?
- ACH4
- BOF2
- CCl2
- DK2O
- Enone of the above
83Which of the following molecules is the most polar?
- AHCl
- BBrF
- CBr2
- DCO
84Which of the following statements is untrue?
- ACovalent molecules usually have low melting points.
- BCovalent molecules can have nonbonding electrons.
- CCovalent bonds can involve more than one pair of electrons.
- DCovalent molecules are never crystalline.
- EAll of the above statements are true.
85Which of the following elements will most likely form an ion with a +1 charge?
- AAl
- BMg
- CCl
- DNa
- ESi
86Which of the following is not a property of metal?
- Aconducts electricity
- Bis strong, but can be bent
- Cdoes not conduct heat well
- Dis shiny
- EAll of the above are properties of metals.
87Is an ionic compound an example of a chemical compound, or is a chemical compound an example of an ionic compound?
- AAn ionic compound is an example of a chemical compound.
- BEach is an example of the other.
- CAn chemical compound is an example of a ionic compound.
- DNeither is an example of the other.
88Which of the following statements describes a saturated solution?
- Aa solution of salt water with salt at the bottom
- Ba carbonated beverage with bubbles
- Ca solution where the solvent cannot dissolve any more solute
- Dall of the above
- Enone of the above
89What is molarity?
- Athe number of liters of solute per mole of solution
- Bthe number of moles of solute per liter of solution
- Cthe number of moles of solute per liter of solvent
- Dthe number of grams of solute per liter of solution
- Enone of the above
90The following image represents which kind of matter?
- Aan element
- Ba mixture
- Ca compound
- Dnone of the above
- Eall of the above
91Is the air in your house a homogeneous or heterogeneous mixture?
- Aheterogeneous because of the dust particles it contains
- Bhomogeneous because it is all at the same temperature
- Chomogeneous because it is mixed very well
- Dheterogeneous because it consists of different types of molecules
92Which of the following would be considered a heterogeneous mixture?
- Awater
- Bmilk
- Cvinegar
- Dvegetable oil
- Esalad dressing
93Which of the following is a mixture?
- Ahelium
- Biron
- Cair
- Dgold
- Esalt
94How is the solubility of a gas affected by temperature?
- AAs temperature goes up, the solubility goes up
- BAs temperature goes up, the solubility stays the same.
- CAs temperature goes down, the solubility goes down.
- DAs temperature goes down, the solubility goes up.
- Eboth A and B
Informações
- Descrição
- Conceptual physical science
- Autor
- Kimberly Lopez
- Idioma
- English
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