WorksheetsUNIT 2 EXAM REVIEW
Total questions: 15
Worksheet time: 15mins
Which of the following scientific claims about the bond in the molecular compound HF is most likely to be true?
There is a partial negative charge on the H
H atom.
Electrons are shared equally between the H
H and F atoms.
The bond is highly polar.
Typically, metals are both malleable and ductile. The best explanation for these properties is that the electrons involved in bonding among metal atoms are
unequally shared and form nondirectional bonds
unequally shared and form highly directional bonds
equally shared and form nondirectional bonds
The elements and have the same electronegativity value, 2.55. Which of the following claims about the compound that forms from and is most likely to be true?
The carbon-to-selenium bond is unstable.
The carbon-to-selenium bond is nonpolar covalent.
The compound has the empirical formula .
Two pure elements react to form a compound. One element is an alkali metal, and the other element is a halogen. Which of the following is the most valid scientific claim that can be made about the compound?
It has the formula XZ2
It does not dissolve in water.
It contains ionic bonds.
Which of the following correctly indicates whether the solid represented by the particulate model shown above conducts electricity and explains why or why not?
It conducts electricity because it is made of positive and negative ions.
It conducts electricity because it is made of particles of different sizes.
It does not conduct electricity because its ions cannot move freely within the solid
On the basis of Coulomb’s law, which of the following best helps to explain the large difference between the lattice energies of NaF and MgF2
The electronegativity of Mg is greater than that of Na.
The mass of the cation Mg is greater than that of the cation Na.
The charge of the cation Mg is larger than that of the cation Na.
The phenomenon shown in the diagram best supports which of the following claims about the bonding in C6H6 ?
In the C6H6 molecule, all the bonds between the carbon atoms have the same length.
A Because of variable bonding between its carbon atoms, C6H6C6H6 is a good conductor of electricity.
The bonds between carbon atoms in C6H6 are unstable, and the compound decomposes quickly.
Which of the following Lewis diagrams best represents the bonding in the N2O molecule, considering formal charges?
A
B
C
D
Which of the following statements, if true, would support the claim that the NO3− ion, represented above, has three resonance structures?
The NO3− ion is not a polar species.
The oxygen-to-nitrogen-to-oxygen bond angles are 90°
One of the bonds in NO3− is longer than the other two.
Which of the following claims about the molecules is best supported by the diagrams?
All the molecules have the same empirical formula.
The strongest carbon-to-carbon bond occurs in molecule 3.
The C-C-C bond angle in molecule 2 is close to 180°.
Which diagram represents a molecule that has a bent molecular geometry?
A
B
C
D
The BF3 molecule is nonpolar, whereas the NF3 molecule is polar. Which of the following statements accounts for the difference in polarity of the two molecules?
N — F bonds are polar, whereas B — F bonds are nonpolar.
NF3 is an ionic compound, whereas BF3 is a molecular compound.
Unlike BF3 , NF3 has a nonplanar geometry due to an unshared pair of electrons on the N atom.
Which of the following species is NOT planar?
A
B
C
D
E
Which of the following molecules contains polar covalent bonds but is a nonpolar molecule?
CCl4
CH3Cl
NH3
CH2Cl2
Which of the molecules represented below contains carbon with sp2 hybridization?
CH4
CH2Cl2
C2H6
C2H2Cl2
