WorksheetsChemical Bonding review
Total questions: 16
Worksheet time: 11mins
What are the interactions formed and broken when magnesium sulfate dissolves in water?
Hydrogen bonding formed; ionic bonds broken
Ionic bonds formed; hydrogen bonding broken
Ion-dipole attractions formed; ionic bonds and hydrogen bonding broken
Permanent dipole-permanent dipole attractions formed; ionic bonds and hydrogen bonding broken
Which of the following correctly explains why bromine does not readily dissolve in water?
The energy released when weak permanent dipole-permanent dipole attractions are formed between Br2 and H2O molecules is insufficient to compensate for the energy needed to overcome the stronger hydrogen bonding between H2O molecules
The energy released when weak instantantaneous dipole-induced dipole attractions are formed between Br2 and H2O molecules is insufficient to compensate for the energy needed to overcome the stronger hydrogen bonding between H2O molecules
The energy released when hydrogen bonds are formed between Br2 and H2O molecules is insufficient to compensate for the energy needed to overcome the stronger hydrogen bonding between H2O molecules
Which of the following descriptions of electrical conductivity is incorrect?
Ionic compounds can conduct electricity in molten or aqueous state due to the presence of mobile ions
Graphite can conduct electricity in solid state due to the presence of delocalised valence electrons
Metals can conduct electricity in solid state due to the presence of mobile ions and electrons
HCl can conduct electricity in aqueous solution due to the presence of mobile ions
How many σ and π bonds are present in this molecule? (count carefully)
8, 2
8, 4
10, 4
12, 2
Which of the following descriptions of bonds is incorrect?
Ionic bonds are the electrostatic attraction between oppositely charged ions
Metallic bonds are the electrostatic attraction between a lattice of positive ions and delocalised electrons
Covalent bonds are the electrostatic attraction both within and between molecules
Covalent bonds are the electrostatic attraction between a shared pair of electrons and positively charged nuclei
Which of the following shows the correct dot-and-cross diagram for Al2Cl6?
According to VSEPR theory, which is NOT a possible shape of a molecule with exactly 3 electron pairs around the central atom?
Trigonal planar
V-shaped
Trigonal pyramidal
Bent
According to VSEPR theory, what is the shape of SF4? (make sure you know how to draw the dot-and-cross diagram)
Square planar (6 bp, 2 lp)
Trigonal bipyramidal (5 bp, 0 lp)
Distorted tetrahedral (4 bp, 1 lp)
Tetrahedral (4 bp, 0 lp)
Which of the following molecules is/are polar?
HCl
C2H4
CO2
CH4
CO
What is the predominant intermolecular force of attraction in CHCl3?
Instantaneous dipole-induced dipole forces of attraction
Permanent dipole-permanent dipole forces of attraction
Hydrogen bonding
Van der Waals' forces of attraction
Which of the following explains why iodine is a solid but ammonia is a gas at room temperature?
The instantaneous dipole-induced dipole (id-id) attractions between I2 molecules are weaker than the hydrogen bonding between NH3 molecules.
The permanent dipole-permanent dipole (pd-pd) attractions between I2 molecules are stronger than that between NH3 molecules.
The instantaneous dipole-induced dipole (id-id) attractions between I2 molecules are stronger than the hydrogen bonding between NH3 molecules.
More energy is required to overcome the intermolecular forces of attraction in NH3 than in I2.
Ethanol (CH3CH2OH) is soluble in water but tetrachloromethane (CCl4) is not. Which of the following statements does not account for this?
Tetrachloromethane has weaker covalent bonds than ethanol.
Ethanol is a polar molecule, but tetrachloromethane is non-polar.
A hydrogen bond forms between the –OH Group in ethanol and the water molecule.
Only weak instantaneous dipole-induced dipole attractions exist between tetrachloromethane molecules.
A solid G has the following physical properties.
· It is insoluble in water.
· It melts at 1310°C.
· It conducts electricity in molten state.
· It is hard and brittle.
What is the likely structure of G?
an ionic crystal lattice
a metallic crystal lattice
a simple molecular crystal lattice
a giant molecular crystal lattice
Which of the following molecules is the least soluble in tetrachloromethane, CCl4? (Hint: what type of IMF would be formed and broken?)
Br2
NH3
CH3CH3
H2O
On a scale of 1-5, how well do you think you've mastered Chemical Bonding? (1: I still have quite a few doubts, 5: I'm ready to move on to new challenges)
1
2
3
4
5
What are some aspects of Chem bonding you'd like more practice/ clarifications in?
