Which bonds are arranged in order of increasing polarity?

• H–F < H–Cl < H–Br < H–I

• H–I < H–Br < H–F < H–Cl

• H–I < H–Br < H–Cl < H–F

• H–Br < H–I < H–Cl < H–F

Which describes correctly the bonding type and melting point of carbon and carbon-dioxide?

• C: covalent/high melting point

  CO₂: covalent/low melting point

• C: ionic/lowmelting point

  CO₂: ionic/high melting point

• C: ionic/high melting point

  CO₂: ionic/low melting point

• C: covalent/lowmelting point

  CO₂: covalent/high melting point

Tags

NGSS.HS-PS1-3

What is the correct order of increasing boiling points?

• CH₃CH₃ < CH₃CH₂Cl < CH₃CH₂Br < CH₃CH₂I

• CH₃CH₂Cl < CH₃CH₂Br < CH₃CH₃ < CH₃CH₂I

• CH₃CH₂I < CH₃CH₂Br < CH₃CH₂Cl < CH₃CH₃

• CH₃CH₂Br < CH₃CH₂Cl < CH₃CH2I < CH₃CH₃

Which statements about hybridization are correct?

I The hybridization of carbon in diamond is sp³.

II The hybridization of carbon in graphite is sp².

III The hybridization of carbon in C₆₀ fullerene is sp³.

• I and II only

• I and III only

• II and III only

• I, II. and III

How many sigma and pi bonds are present in a molecule of propyne, CH₃CCH?

• sigma: 5

  pi: 3

• sigma: 6

  pi: 2

• sigma: 7

  pi: 1

• sigma: 8

  pi: 0

Which compound forms hydrogen bonds in the liquid state?

• C₂H₅OH

• CHCl₃

• CH₃CHO

• (CH₃CH₂)₃N

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

• BF₃

• SO_2

• PCl_5

• SiF₄

Which species does not have delocalized electrons

• NO₃^–

• NO₂^–

• O₃

• C₃H₆

Tags

NGSS.HS-PS1-1

Which species contain a dative covalent bond?

I HCHO

II CO

III H₃O⁺

• I and II only

• I and III only

• II and III only

• I, II, and III

Which molecule has an octahedral shape?

• SF₆

• PCl₅

• XeF₄

• BF₃