Question

grade 11 chemistry sch3u test 1. matter and chemical bonding
name: arnold bongura

multiple choice-identify the choice that best completes the statement or answers the question.

1. which of the following atoms is believed to contain three lone pairs of electrons?

a. h
b. al
c. b
d. c
e. cl

1. binary ionic compounds

a. contain two ions with charges of 2+ and 2-
b. are formed from the combination of two nonmetal ions
c. are composed of only two kinds of monatomic ions
d. contain a transition metal cation
e. contain double bonds

1. multivalent metals

a. can form more than one ion, each with its own charge
b. can exist in several different crystalline forms
c. appear only in the representative metal groups
d. contain more than one populated energy level
e. form an ion whose charge is 2+ or greater

1. the iupac name for ( p_2i_4(s) ) is

a. phosphorus iodide
b. diphosphorus tetraiodide
c. tetraphosphorus diiodide
d. phosphorus pentaiodide
e. dipotassium tetraiodide

1. which of the following formulas does not represent a molecular compound?

a. ( co(g) )
b. ( co(s) )
c. ( co_2(g) )
d. ( ch_4(g) )
e. ( nh_3(l) )

1. an electron dot diagram for a nitrogen atom should show

a. 1 lone pair and 3 bonding electrons
b. 2 lone pairs and 2 bonding electrons
c. 2 lone pairs and 3 bonding electrons
d. 3 lone pairs and 1 bonding electrons
e. 3 bonding electrons

1. an example of a binary compound is

a. ( naoh )
b. ( o_2 )
c. ( h_2s )
d. ( caco_3 )
e. ( co )

Explanation:

1. Cl has 7 valence electrons; 1 bonding electron leaves 6 electrons (3 lone pairs).
2. Binary ionic compounds have two monatomic ions (metal + nonmetal).
3. Multivalent metals form ions with different charges (e.g., Fe²⁺, Fe³⁺).
4. P₂I₄ uses prefixes: di- (2 P) + tetra- (4 I) → diphosphorus tetraiodide.
5. Co is a metal element, not a molecular compound (molecular compounds have nonmetals).
6. N has 5 valence electrons: 1 lone pair (2 e⁻) + 3 bonding electrons (3 e⁻).
7. H₂S has two elements (H + S); others have ≥3 elements or are elements.

Answer:

1. e. Cl
2. c. are composed of only two kinds of monatomic ions
3. a. can form more than one ion, each with its own charge
4. b. diphosphorus tetraiodide
5. b. Co(s)
6. a. 1 lone pair and 3 bonding electrons
7. c. H₂S