IB Chemistry Topic 4

How many atoms is each carbon directly bonded to in its allotropes? 

• Diamond 3, Graphite 3, fullerene 3
• Diamond 4, Graphite 3, fullerene 3
• Diamond 4, Graphite 3, fullerene 4
• Diamond 4, Graphite 4, fullerene 3

What is the bond angle in the H₃O⁺ ion? 

• 104
• 107
• 109
• 120

What is the correct order if the compounds are arranged in order of increasing boiling point? 

• CH₄ < CH₃Cl < SiH₄ < CH₃OH 
• CH₃OH < CH₄ < CH₃Cl < SiH₄ 
• CH₃OH < CH₃Cl < SiH₄ < CH₄ 
• CH₄ < SiH₄ < CH₃Cl < CH₃OH 

Tags

NGSS.HS-PS1-3

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

• 0
• 1
• 2
• 3

Which molecule has the shortest bond between carbon atoms? 

• C₂H₆ 
• C₂H₄ 
• C₂H₂ 
• C₂H₄Cl₂ 

Which substance is made up of a lattice of positive ions and free moving electrons? 

• Graphite 
• Sodium chloride 
• Sulfur 
• Sodium 

What is the shape of the ammonia molecule, NH₃? 

• Trigonal planar 
• Trigonal pyramidal 
• Linear 
• V-shaped (bent) 

Which compound does not form hydrogen bonds? 

• C₂H₅OH 
• CHCl₃ 
• CH₃CHO 
• (CH₃CH₂)₃N 

How do the bond angles in CH₄, NH₃ and H₂O compare? 

• CH₄ = NH₃ = H₂O 
• CH₄ < NH₃ < H₂O 
• NH₃ < CH₄ < H₂O 
• H₂O < NH₃ < CH₄ 

Which molecule has a non-bonding (lone) pair of electrons on the central atom? 

• BF₃ 
• SO₂ 
• CO₂ 
• SiF₄