chemistry questions 4

(1) The number of valence electrons possessed by an atom can never exceed four. (2) Binary ionic compounds containing two nonmetals do not occur. (3) The name of the ionic compounds Cu 2 S is copper(II) sulfide. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

C) Only one of the statements is true.

(1) The octet rule is used to determine the number of valence electrons an atom possesses. (2) The formula for the compound sodium carbonate contains parenthesis. (3) Group IIA and VIA elements form ions which carry two units of charge. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

C) Only one of the statements is true.

Which of the following ions is not isoelectronic with the noble gas xenon? A) Cs + B) I - C) Sn 4+ D) Sb 3-

C) Sn 4+

The "octet rule" relates to the number eight because A) only atoms with 8 valence electrons undergo chemical reaction. B) ions with charges of +8 and -8 are very stable. C) atoms, during compound formation, frequently obtain 8 valence electrons. D) all electron subshells can hold 8 electrons.

C) atoms, during compound formation, frequently obtain 8 valence electrons.

Which one of the following compounds has a formula which contains parentheses? A) strontium carbonate B) lithium nitrate C) barium hydroxide D) ammonium nitrate

C) barium hydroxide

For representative elements, valence electrons are those electrons located A) closest to the nucleus. B) in the outermost subshell. C) in the outermost shell. D) in s orbitals.

C) in the outermost shell.

Which of the following elements would be expected to form a monoatomic ion with a charge of +2? A) oxygen B) sulfur C) magnesium D) more than one correct response E) no correct response

C) magnesium

Which of the following pairings of compound name and compound formula is incorrect? A) sodium acetate - NaC 2 H 3 O 2 B) barium sulfate - BaSO 4 C) magnesium nitrate - MgNO 3 D) more than one correct response E) no correct response

C) magnesium nitrate - MgNO 3

Which of the following statements about polyatomic ions is correct? A) all have names which end in -ate B) all must contain oxygen C) they must contain more than one atom and be charged D) all carry a charge of negative one

C) they must contain more than one atom and be charged

(1) Hydrogen carbonate and bicarbonate are two names for the same polyatomic ion. (2) The symbol for an atom of X that has lost two electrons is X 2-. (3) In all ionic compounds the total charge of the ions present per formula unit must add up to zero. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

B) Two of the three statements are true.

(1) Representative elements in the same group of the periodic table have the same number of valence electrons. (2) Discrete molecules do not exist in ionic compounds. (3) A sulfate ion has one less oxygen than a sulfite ion. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

B) Two of the three statements are true.

Formation of a positive ion is the result of an atom A) losing one or more protons. B) losing one or more electrons. C) gaining one or more protons. D) gaining one or more electrons.

B) losing one or more electrons.

Which of the following pairings of compound name and compound formula is incorrect? A) sodium oxide - Na 2 O B) magnesium sulfide - MgS 2 C) potassium chloride - KCl D) more than one correct response E) no correct response

B) magnesium sulfide - MgS 2

The correct name for the ionic compounds V 2 Se 3 is A) vanadium selenide B) vanadium(III) selenide C) vanadium triselenide D) divanadium triselenide

B) vanadium(III) selenide

Which of the following statements is an accurate description of the structure of the ionic compound NaBr A) alternating layers of Na and Br atoms are present B) alternating layers of Na + and Br - ions are present C) individual molecules containing a Na + and Br - ion are present D) each cation present is surrounded by six anions in an extended array

D) each cation present is surrounded by six anions in an extended array

Which of the following compounds contains 4 atoms per formula unit? A) vanadium(III) nitride B) lead(II) iodide C) calcium iodide D) iron(III) chloride

D) iron(III) chloride

The Roman numeral (III) in the name manganese(III) oxide indicates that A) there are three times as many manganese atoms present as oxygen atoms B) there are three manganese atoms per formula unit C) there are three oxygen atoms per formula unit D) manganese is present in the form of +3 ions

D) manganese is present in the form of +3 ions

In the formation of which of the following ionic compounds is the number of electrons transferred per formula unit equal to three? A) AlN B) K 3 N C) BaCl 2 D) more than one correct response E) no correct response

D) more than one correct response

In which of the following compounds is there a one-to-two ratio between positive and negative ions? A) calcium sulfide B) magnesium bromide C) lead(IV) oxide D) more than one correct response E) no correct response

D) more than one correct response

In which of the following pairs of ions do both members of the pair contain the same total number of electrons? A) S 2- and Cl - B) Na + and K + C) Al 3+ and N 3- D) more than one correct response E) no correct response

D) more than one correct response

Which of the following compounds contain more than 10 atoms per formula unit? A) ammonium phosphate B) aluminum carbonate C) iron(III) cyanide D) more than one correct response E) no correct response

D) more than one correct response

Which of the following elements would have a Lewis symbol that contains 5 electrons? A) nitrogen B) fluorine C) phosphorus D) more than one correct response E) no correct response

D) more than one correct response

In which of the following pairs of polyatomic ions do both members of the pair have the same charge? A) sulfate and phosphate B) carbonate and hydroxide C) ammonium and nitrate D) more than one correct response E) no correct response

E) no correct response

The mechanism for ionic bond formation always involves the transferring of A) electrons from nonmetallic atoms to metallic atoms. B) protons from the nucleus of metallic atoms to the nucleus of nonmetallic atoms. C) sufficient electrons to produce ions of equal but opposite charge. D) more than one correct response E) no correct response

E) no correct response

Which of the following is an incorrect statement about the number of electrons lost or gained by a representative element during ion formation? A) The number is usually 3 or less. B) The number is governed by the octet rule. C) The number is related to the position of the element in the periodic table. D) more than one correct response E) no correct response

E) no correct response

1s 2 2s 2 2p 6 3s 1 a) 1 valence electron b) 3 valence electrons c) 5 valence electrons d) 7 valence electrons

a) 1 valence electron

+1 monoatomic ions are present. a) K3N b) AlF3 c) CaSO4 d) (NH4)2S

a) K3N

M2+ and X2- a) MX b) M2X c) MX2 d) M2X3

a) MX

contains one hydrogen atom a) hydroxide ion b) ammonium ion c) nitrate ion d) sulfate ion

a) hydroxide ion

More negative ions are present than positive ions. a) K3N b) AlF3 c) CaSO4 d) (NH4)2S

b) AlF3

Contains the elements nitrogen and hydrogen a) hydroxide ion b) ammonium ion c) nitrate ion d) sulfate ion

b) ammonium ion

Calcium chloride a) two atoms per formula unit b) three atoms per formula unit c) four atoms per formula unit d) five or more atoms per formula unit

b) three atoms per formula unit

Copper(I) sulfide a) two atoms per formula unit b) three atoms per formula unit c) four atoms per formula unit d) five or more atoms per formula unit

b) three atoms per formula unit

Sodium oxide a) two atoms per formula unit b) three atoms per formula unit c) four atoms per formula unit d) five or more atoms per formula unit

b) three atoms per formula unit

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 a) 1 valence electron b) 3 valence electrons c) 5 valence electrons d) 7 valence electrons

c) 5 valence electrons

Group VA element a) 1 valence electron b) 3 valence electrons c) 5 valence electrons d) 7 valence electrons

c) 5 valence electrons

Lewis symbol is . . : X : . a) 1 valence electron b) 3 valence electrons c) 5 valence electrons d) 7 valence electrons

c) 5 valence electrons

Positive and negative ions present carry the same amount of charge. a) K3N b) AlF3 c) CaSO4 d) (NH4)2S

c) CaSO4

Two ions are present per formula unit. a) K3N b) AlF3 c) CaSO4 d) (NH4)2S

c) CaSO4

M has 2 valence electrons and X has 7 valence electrons a) MX b) M2X c) MX2 d) M2X3

c) MX2

M2+ and X- a) MX b) M2X c) MX2 d) M2X3

c) MX2

Contains three oxygen atoms a) hydroxide ion b) ammonium ion c) nitrate ion d) sulfate ion

c) nitrate ion

contains a total of four atoms a) hydroxide ion b) ammonium ion c) nitrate ion d) sulfate ion

c) nitrate ion

-2 monoatomic ions are present. a) K3N b) AlF3 c) CaSO4 d) (NH4)2S

d) (NH4)2S

1s 2 2s 2 2p 6 3s 2 3p 5 a) 1 valence electron b) 3 valence electrons c) 5 valence electrons d) 7 valence electrons

d) 7 valence electrons

M is a group IIIA element and X is a groups VIA element a) MX b) M2X c) MX2 d) M2X3

d) M2X3

M3+ and X2- a) MX b) M2X c) MX2 d) M2X3

d) M2X3

Aluminum phosphate a) two atoms per formula unit b) three atoms per formula unit c) four atoms per formula unit d) five or more atoms per formula unit

d) five or more atoms per formula unit

Iron(II) hydroxide a) two atoms per formula unit b) three atoms per formula unit c) four atoms per formula unit d) five or more atoms per formula unit

d) five or more atoms per formula unit

has a negative two charge a) hydroxide ion b) ammonium ion c) nitrate ion d) sulfate ion

d) sulfate ion

For which of the following elements is the listed number of valence electrons correct? A) Al - 3 valence electrons B) Cl - 5 valence electrons C) Si - 2 valence electrons D) more than one correct response E) no correct response

A) Al - 3 valence electrons

(1) Calcium sulfide is a compound in which both types of ions present have the same electron configuration, that of the noble gas argon. (2) The charge on the positive ions present in the compound Al 2 S 3 is +3. (3) The polyatomic ions ammonium and cyanide do not contain oxygen. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

A) All three statements are true.

In which of the following ionic compounds are ions with a +1 charge present? A) Cs 2 Te B) Ga 2 Te 3 C) Be 2 Si D) CaS

A) Cs 2 Te

The correct formula for the ionic compound formed between Na and N is A) Na 3 N B) NaN 3 C) Na 2 N 3 D) Na 3 N 2

A) Na 3 N

The correct name for the ionic compound Al 2 Se 3 is A) aluminum selenide B) aluminum(III) selenide C) aluminum triselenide D) dialuminum triselenide

A) aluminum selenide

Elements in groups IA and IIIA of the periodic table possess, respectively, how many valence electrons? A) 1 and 1 B) 1 and 3 C) 3 and 1 D) 8 and 8

B) 1 and 3

Which of the following ionic compounds would have a name that contains the Roman numeral III? A) AlCl 3 B) FeBr 3 C) Cu 3 N D) more than one correct response E) no correct response

B) FeBr 3

In which of the following pairs of ionic compounds do both members of the pair contain +1 ions? A) KCl and CaO B) Na 3 N and Li 2 S C) AlCl 3 and MgF 2 D) more than one correct response E) no correct response

B) Na 3 N and Li 2 S

(1) All ionic compounds which contain metal ions have names which contain Roman numerals. (2) Ionic compounds tend to have high melting points and be good conductors of electricity when in the molten state. (3) Three ions are present in one formula unit of a compound that contains Na + and O 2- ions. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

B) Two of the three statements are true.

How many total electrons are present in a N 3- ion? A) 4 B) 7 C) 10 D) 12

C) 10

How many electrons appear in the Lewis symbol for an element whose electron configuration is 1s 2 2s 2 2p 4 ? A) 2 B) 4 C) 6 D) 8

C) 6

The correct formula for the ionic compound containing Ga 3+ and Te 2- ions would be A) GaTe B) Ga 3 Te 2 C) Ga 2 Te 3 D) Ga 2 Te

C) Ga 2 Te 3

In which of the following pairings is the chemical formula not consistent with the ions shown? A) M 2+ , X 3- , M 3 X 2 B) M 2+ , X - , MX 2 C) M + , X 3- , MX 3 D) more than one correct response E) no correct response

C) M + , X 3- , MX 3

(1) If an atom loses one or more electrons, it becomes negatively charged because protons now outnumber electrons. (2) Nitrogen, a group VA element, possesses 5 valence electrons. (3) Polyatomic ions are generally not very stable and usually lose their identity during chemical reactions. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

C) Only one of the statements is true.

(1) Ionic bonds result from the sharing of one or more pairs of electrons. (2) The compound copper(II) phosphate contains eight oxygen atoms per formula unit. (3) Ionic compounds which contain fixed charge metals cannot contain polyatomic ions. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

C) Only one of the statements is true.

(1) The most abundant ion in hard water is usually Na + . (2) Fresh water purified for drinking purposes contains no ions. (3) Tooth enamel contains both monatomic and polyatomic ions. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

C) Only one of the statements is true.

Elements in groups IIA and VIIA of the periodic table would, respectively, be expected to form ions with charges of A) +2 and +7 B) -2 and -7 C) +2 and +1 D) +2 and -1

D) +2 and -1

In which of the following pairs of compounds are both members of the pair ionic compounds? A) NF 3 and HI B) Na 2 Se and NF 3 C) KBr and H 2 Se D) KCl and ZnO

D) KCl and ZnO

(1) An atom with the electron configuration 1s 2 2s 2 2p 2 possesses two valence electrons. (2) The formula of the ionic compounds that contains Ba 2+ and N 3- ions is Ba 2 N 3 . (3) The polyatomic ions nitrate and azide are both tetraatomic entities. A) All three statements are true. B) Two of the three statements are true. C) Only one of the statements is true. D) None of the statements is true.

D) None of the statements is true.

The formulas of the sulfate ion, the nitrate ion, and the phosphate ion are, respectively, A) SO 3 2- , NO 3 2- , PO 3 2- B) SO 4 2- , NO 4 2- , PO 4 2- C) SO 4 2- , NO 3 - , PO 4 2- D) SO 4 2- , NO 3 - , PO 4 3-

D) SO 4 2- , NO 3 - , PO 4 3-