IB Chem semester review (topic 1, 2, 3, 4, 11)

What compound is formed when lithium reacts with selenium?

• LiSe

• Li₂Se

• LiSe₂

• Li₂Se₂

Tags

NGSS.HS-PS1-2

How many non-bonding pairs of electrons are there in a nitrogen molecule?

• 0
• 1
• 2
• 3

Which molecule contains a bond angle of approximately 120°?

• CH₄

• C₂H₂

• C₂H₄

• C₂H₆

Which compound does not form hydrogen bonds between its molecules?

• CH₃NH₂

• CH₃COCH₃

• CH₃COOH

• CH₃CH₂OH

Which substance does not conduct electricity?

• Solid zinc
• Molten zinc
• Solid zinc chloride
• Molten zinc chloride

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-6

Which is the best description of ionic bonding?

• The electrostatic attraction between positively charged nuclei and an electron pair
• The electrostatic attraction between positive ions and delocalized negative ions
• The electrostatic attraction between positive ions and delocalized electrons
• The electrostatic attraction between oppositely charged ions

Tags

NGSS.HS-PS2-4

Which is the best description of the bonding present in silicon dioxide, SiO₂?

• Each silicon atom forms four single covalent bonds to oxygen atoms.

• Each silicon atom forms two double covalent bonds to oxygen atoms.

• Each silicon atom forms two single covalent bonds to oxygen atoms.

• Each silicon atom forms four double covalent bonds to oxygen atoms.

Which statement best describes the intramolecular bonding in HCN(l)?

• Electrostatic attractions between H⁺ and CN^- ions

• Only van der Waals’ forces

• Van der Waals’ forces and hydrogen bonding

• Electrostatic attractions between pairs of electrons and positively charged nuclei

Which statement best describes metallic bonding?

• Electrostatic attractions between oppositely charged ions
• Electrostatic attractions between a lattice of positive ions and delocalized electrons
• Electrostatic attractions between a lattice of negative ions and delocalized protons
• Electrostatic attractions between protons and electrons

Metal M has only one oxidation number and forms a compound with the formula MCO₃. Which formula is correct?

• MNO₃

• MNH₄

• MSO₄

• MPO₄