Question

1. which molecule contains a double bond?

a. c₃h₈
c. c₂h₄
b. cf₄
d. sf₂

1. tetraphosphorus decaiodide is represented by which formula?

a. p₄i₁₀
c. p₃i₁₀
b. p₃i₈
d. p₄i₈

1. which one of the following compounds is not covalent?

a. scl₃
c. hcl
b. kcl
d. s₂cl₂

1. a covalent bond forms

a. when an element becomes a noble gas.
b. when atoms share electrons.
c. between metals and nonmetals.
d. when electrons are transferred from one atom to another.

1. which type of intermolecular force is represented by the arrows in the image below?

a. hydrogen bond
c. dipole - dipole
b. ionic
d. london / dispersion force

1. which molecule is correctly matched with its shape as predicted by vsepr theory?

a. h₂o - tetrahedral
c. nh₃ - trigonal planar
b. pcl₃ - pyramidal
d. of₂ - linear

1. name this compound according to the iupac nomenclature rules. ca(oh)₂

a. calcium oxide hydride
c. calcium(iii) hydroxide
b. calcium hydroxide
d. calcium(ii) oxide hydride

1. name this compound according to iupac nomenclature rules. no

a. nitrogen monoxide
c. nitrogen oxide
b. nitrogen oxygen
d. mononitrogen monoxide

1. ni₃ is an extremely sensitive contact explosive. use iupac rules to name this compound.

a. mononitrogen iodide
c. nitrogen triiodide
b. mononitrogen triiodide
d. nitrogen iodide

Explanation:

1.

• For \(C_2H_6\), it has single - bonds (ethane, \(CH_3 - CH_3\)).
• For \(CF_4\), it has single - bonds (\(C - F\) single bonds).
• For \(C_2H_4\), it has a \(C = C\) double bond (ethene, \(H_2C=CH_2\)).
• For \(SF_2\), it has single - bonds (\(S - F\) single bonds).

• The prefix “tetra -” means 4 and “deca -” means 10. For phosphorus (\(P\)) and iodine (\(I\)), the formula is \(P_4I_{10}\).

• \(SCl_2\) is covalent (non - metal - non - metal).
• \(KCl\) is ionic (metal \(K^+\) and non - metal \(Cl^-\)).
• \(HCl\) is covalent (non - metal - non - metal in the gas phase, though it ionizes in water).
• \(S_2Cl_2\) is covalent (non - metal - non - metal).

Answer:

c. \(C_2H_4\)

2.