Chemistry Exam Review

A cube has a volume of 8.0 cubic centimeters and a mass of 21.6 grams, the density of the cube is best expressed as A. 2.7 B. 2.70 C. .37 D. .370

A 2.7

In the compound K2(Cr2O7), what is the algebraic sum of the oxidation numbers of all the atoms? A. 0 B. -5 C. +9 D. -14

A. 0

Which is the equivalent of 750 calories? A. 0.750 kcal B. 7.50 kcal C. 75.0 kcal D. 750 kcal

A. 0.750 kcal

What is the total number of electrons in a magnesium (+2) ion? A. 10 B. 2 C. 12 D. 24

A. 10

What is the total number of neutrons in an atom of fluorine,is whose atomic number is 9 and whose mass 19? A. 10 B. 9 C. 19 D.28

A. 10

The number of protons in an atom of Cl-36 is A. 17 B. 18 C. 35 D. 36

A. 17

Which energy level transition represents the greatest absorption energy? A. 1s to 3p B. 2p to 3s C. 3s to 3p D. 3s to 4s

A. 1s to 3p

An atom that contains 35 protons, 45 neutrons, and 35 electrons has an atomic number of A. 35 B. 45 C. 80 D. 115

A. 35

If a temperature of a substance changes 40 Celsius degrees, how many degrees would its temperature change on the Kelvin scale? A. 40 B. 233 C. 273 D. 313

A. 40

Which sublevel represents the lowest energy level? A. 4s B. 4p C. 4d D. 4f

A. 4s

What is the total number of valence electrons in an atom of phosphorus in the ground state? A. 5 B. 2 C. 3 D. 7

A. 5

Which molecule is impossible? A. CH B. C2H2 C. C2H4 D. C4H8

A. CH

Which formula represents potassium hydride? A. KH B. KH2 C. K(OH) D. K(OH)2

A. KH

Given the general formula XCl2, which element in Period 3 will form a chloride having the above formula? A. Mg B. Na C. Ar D. Si

A. Mg

The element in Period 3 with the most metallic character is A. Na B. Al C. Si D. P

A. Na

Which formula represents a mixture? A. NaCl (aq) B. NaCl (s) C. H20 (l) D. H20 (s)

A. NaCl (aq)

The element in Period 3 that has the highest ionization energy is A. a noble gas B. a halogen C. an alkali metal D. an alkaline earth metal

A. a noble gas

Isotopes are atoms which have different A. atomic masses B. atomic numbers C. atomic radii D. electron configuration

A. atomic masses

Isotopes are atoms which have different A. atomic masses B. atomic numbers C. atomic radii D. electron configurations

A. atomic masses

The elements in the present periodic table are arranged according to their A. atomic numbers B. atomic masses C. mass numbers D. oxidation state

A. atomic number

Which atom in the ground state has only one unpaired electron in its valence shell? A. boron B. carbon C. nitrogen D. oxygen

A. boron

Which element will form a +2 ion the easiest? A. calcium B. oxygen C. sodium D. Aluminum

A. calcium

Which element will never have a positive oxidation number? A. fluorine B. magnesium C. sodium D. cesium

A. fluorine

The neutral atoms in a given sample of an element could have different A. mass numbers B. atomic numbers C. number of protons D. number of electrons

A. mass numbers

Elements that have properties of both metals and nonmetals are called A. metalloids B. halogens C. alkali metals D. transition elements

A. metalloids

The majority of the elements in the Periodic Table are A. metals B. nonmetals C. metalloids D. noble gases

A. metals

Which particle has a mass of approximately 1 mass unit and a unit positive charge? A. proton B. neutron C. electron D. alpha particle

A. proton

The nucleus of the fluorine atom has a charge of A. +1 B. +9 C. +19 D. 0

B. +9

Which is the atomic number of an alkali metal? A. 10 B. 11 C. 12 D. 13

B. 11

How many neutrons are in the nucleus of an atom that has an atomic number of 17 and a mass number of 35? A. 17 B. 18 C. 35 D. 52

B. 18

Which electron configuration represents an element having the highest first ionization energy? A. 1s^1 B. 1s^2 C. 1s^2-2s^1 D. 1s^2-2s^2

B. 1s^2

Which electron configuration represents an atom in the excited state? A. 1s^2-2s^2 B. 1s^2-3p^1 C. 1s^2-2s^2-2p^5 D. 1s^2-2s^2-2p^6

B. 1s^2-3p^1

How many orbitals in a sulfur atom in the ground state contain only one electron? A. 1 B. 2 C. 3 D. 4

B. 2

What is the total number of principal energy levels that are completely filled in an atom of magnesium in the ground state? A. 1 B. 2 C. 3 D. 4

B. 2

What is the total number of neutrons in an atom of K, whose mass is 39 and atomic number is 19? A. 19 B. 20 C. 39 D. 58

B. 20

A liquid's freezing point is -38 C and its boiling point is 357 C, what is the number of Kelvin degrees between the boiling point and the freezing point of the liquid? A. 319 B. 395 C. 592 D. 668

B. 395

Which sublevels are occupied in the outermost principal energy level of an argon atom in the ground state? A. 3s and 3d B. 3s and 3p C. 2s and 3p D. 2p and 3d

B. 3s and 3p

What is the total number of nucleons (protons and neutrons) in an atom of selenium (atomic # = 34, atomic mass = 79) A. 34 B. 79 C. 45 D. 113

B. 79

An element that has an ionic radius larger than its atomic radius is A. Al B. Cl C. Li D. Na

B. Cl

Which two particles have the same electron configuration (are isolelectronic)? A. Cl+1 and F-1 B. Cl-1 and S-2 C. Cl-1 and Ne D. Cl-1 and K

B. Cl-1 and S-2

Which atom has the strongest attraction for electrons? A. Cl B. F C. Br D. I

B. F

Given the same conditions, which of the following Group VIIA elements has the least tendency to gain electrons? A. F B. I C. Br D. Cl

B. I

Given the general formula MCl2, which group will form chlorides with this general formula? A. IA B. IIA C. IIIA D. VA

B. IIA

The oxide of metal X has the formula XO. Which group in the Periodic Table contains metal X? A. IA B. IIA C. IIIA D. VA

B. IIA

If X represents an element of Group IA, the formula of its oxide would be A. XO B. X2O C. XO2 D. X2O3

B. X2O

At STP which element is a solid? A. hydrogen B carbon C. nitrogen D. argon

B. carbon

Which is the most common property of all liquids? A. definite shape B. definite volume C. high compressability D. high vapor pressure

B. definite volume

The characteristic spectrum of an element is produced when A. the energy level of the nucleus is increased B. electrons drop back to lower energy levels C. electrons are raised to higher energy levels D. electrons are emitted by an atom

B. electrons drop back to lower energy levels

A neutral oxygen atom differs from an oxide ion in that the atom has A. more electrons B. fewer electrons C.more protons D. fewer protons

B. fewer electrons

When a fluorine atom becomes an ion, it will A. gain an electron and decrease in size B. gain an electron and increase in size C. lose an electron and decrease in size D. lose an electron and increase in size

B. gain an electron and increase in size

As a sulfur atom becomes a sulfide ion, the radius A. decreases B. increases C. remains the same D. cannot be determined

B. increases

As the elements of Group VA are considered in order of increasing atomic radius, their tendency to lose electrons A. decreases B. increases C. remains the same D. cannot be determined

B. increases

When an atom of bromine forms a bromide ion, the radius A. decreases B. increases C. remains the same D. cannot be determined

B. increases

What is the equivalent of 0 Kelvin on the Celsius scale? A. -100 C B. 100 C C. -273 C D. 273 C

C. -273 C

What is the maximum number of electrons that can occupy the third principal energy level? A. 8 B. 10 C. 18 D. 32

C. 18

Which electron configuration represents a neutral atom of nitrogen in an excited state? A. 1s^2-2s^2-2p^3 B. 1s^2-2s^2-2p^4 C. 1s^2-2s^1-2p^4 D. 1s^2-2s^1-2p^5

C. 1s^2-2s^1-2p^4

Which Kelvin temperature is equal to -33 degrees C? A. -33 K B. 33 K C. 240 K D. 306 K

C. 240 K

How many significant digits are in the number 0.00120? A. 6 B. 2 C. 3 D. 4

C. 3

Which energy level fills after the 4s energy level is filled? A. 4p B. 4d C. 3d D. 5s

C. 3d

Which electron transition is accompanied by the emission of energy? A. 1s to 2s B. 2s to sp C. 3p to 3s D. 3p to 4p

C. 3p to 3s

The nucleus of a fluorine atom has a charge of A. 0 B 19+ C. 9+ D. 1-

C. 9+

Which two particles have the same electron configuration? A. Cl+1 and F-1 B. Cl-1 and Ne C. Cl-1 and S-2 D. Cl-1 and K

C. Cl-1 and S-2

A Mg+2 ion has the same electron configuration as (is isoelectronic with) A. Na+1 B. Ar0 C. F-1 D. Ca+2

C. F-1

An O-2 ion has the same electron configuration as A. S-2 B. Ca+2 C. F-1 D. K+1

C. F-1

Which is the formula of a compound? A. C B. Cl2 C. HF D. N2

C. HF

Given the general formula M2O3. The elements which form oxides with this general formula are in which Group on the P.T.? A. IA B. IIA C. IIIA D. IVA

C. IIIA

Which atom in the ground state has three unpaired electrons in its outermost principal energy level? A. Li B. B C. N D. Na

C. N

Which element in Period 3 has both metallic and nonmetallic properties? A. Na B. Mg C. Si D. Ar

C. Si

When a chlorine atom reacts with a sodium atom to form an ion, the chlorine atom will A. lose one electron B. lose two electrons C. gain one electron D. gain two electrons

C. gain one electron

Which element is a noble gas? A. iron B. nitrogen C. neon D. iodine

C. neon

Which particle is electrically neutral? A. proton B. position C. neutron D. electron

C. neutron

Which of the following atoms will lose an electron most readily? A. potassium B. calcium C. rubidium D. strontium

C. rubidium

Which is not a form of energy? A. light B. electricity C. temperature D. heat

C. temperature

What is the total charge on an ion that contains 10 electrons, 13 protons, and 15 neutrons A. -1 B. +1 C. -3 D. +3

D. +3

What is the total charge on an ion that contains 10 electrons, 13 protons, and 15 neutrons? A. -1 B. +1 C. -3 D. +3

D. +3

The maximum number of electrons in the 3d sublevel is A. 6 B. 2 C. 8 D. 10

D. 10

What is the total number of electrons in a magnesium ion? A. 2 B 12 C. 24 D. 10

D. 10

Element X exists in three isotopic forms. The isotopic mixture consists of 10.0% X-10, 20.0% X-11, and 70.0% X-12, what is the average atomic mass of this element? A. 11.0 B. 12.0 C. 12.4 D. 11.6

D. 11.6

Which is the electron configuration of an atom in the excited state? A. 1s^2-2s^1 B. 1s^2-2s^2-2p^1 C. 1s^2-2s^2- 2p^5 D. 1s^2-2s^2-2p^2-3s^1

D. 1s^2-2s^2-2p^2-3s^1

The maximum number of electrons possible in any principal energy level (principal quantum number = n) is equal to A. n B. 2n C. n^2 D. 2n^2

D. 2n^2

Which orbital may contain the valence electrons of a calcium atom? A. 1s B. 2s C. 3s D. 4s

D. 4s

The alkaline earth element having the largest atomic radius is found in Period A. 1 B. 2 C. 6 D. 7

D. 7

The total number of orbitals in the 4f sublevel is A. 1 B. 5 C. 3 D. 7

D. 7

The correct formula for aluminum sulfate is A. Al2S3 B. Al3S2 C. Al3(SO4)2 D. Al2(SO4)3

D. Al2(SO4)3

Which substance has a definite shape and a definite volume at STP? A. NaCl (aq) B. Cl2 (g) C. CCl4 (l) D. AlCl3 (s)

D. AlCl3 (s)

Which element forms an ion larger than its atom? A. Na B. Mg C. Ba D. Br

D. Br

Which atom has the greatest affinity for an electron? A. Li B. Br C. Na D. Cl

D. Cl

Which element has an atom in the ground state with the most loosely bound outer electron/s? A. He B. As C. Xe D. Cs

D. Cs

Which atom has the smallest radius? A. Li B. Be C. C D. F

D. F

Which of the Group VIIA elements listed below has the greatest nuclear charge? A. F B. Cl C. Br D. I

D. I

Which may be heterogeneous? A. a substance B. an element C. a compound D. a mixture

D. a mixture

All atoms of a given element must have the same A. atomic mass B. atomic weight C. mass number D. atomic number

D. atomic number

A Ca+2 ion differs from a Ca arom in that the Ca+2 ion has A. more protons B. fewer protons C. more electrons D. fewer electrons

D. fewer electrons

As a substance changes from a liquid to a gas, the average distance between molecules A. decreases B. remains the same C. cannot be determined D. increases

D. increases

As a sulfur atom becomes a sulfide ion, the radius A. decreases B. remains the same C. cannot be determined D. increases

D. increases

When an atom of chlorine becomes a chloride ion, its size A. decreases B. remains the same C. cannot be determined D. increases

D. increases

Isotopes of an element have a different A. number of electrons B. number of protons C. atomic number D. mass number

D. mass number

Isotopes of an element have a different A. number of electrons B. number of protons C. atomic number D. mass number

D. mass number

The amount of lithium chloride that the formula LiCl represents is one A. atom B. gram C. liter D. molecule

D. molecule

Which is the smallest particle of a covalent compound that has the chemical properties of that compound? A. ion B. atom C. electron D. molecule

D. molecule

An Na+1 ion is similar to a K+1 ion in that they both have the same A. nuclear change B. number of electrons C. atomic mass D. oxidation number

D. oxidation number

Two isotopes of the same element will have the same number of A. neutrons and electrons B. neutrons and nucleons C. protons and nucleons D. protons and electrons

D. protons and electrons

Two isotopes of the same element will have the same number of A. neutrons and electrons B. neutrons and nucleons C. protons and nucleons D. protons and electrons

D. protons and electrons

The mass number of an atom is equal to the total number of its A. electrons only B. protons only C. electrons and protons D. protons and neutrons

D. protons and neutrons

Which furnishes evidence that electrons in atoms are in definite energy levels? A. electronegativities B. atomic radii C. mass defects D. spectral lines

D. spectral lines

The elements characterized as nonmetals are located in the periodic table at the A. far left B. bottom C. center D. top right

D. top right