AP CHEM Unit 2 Ionic and Covalent Compounds and Properties

Identify the atom with negative polarity in this molecule.

• Hydrogen

• Fluorine

• Neither, both have positive polarity.

• Both have negative polarity.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In this molecule, Carbon has a formal charge of ____ and Nitrogen has a formal charge of _____.

• 0, 0

• 1, 0

• 0, -1

• -1, 0

Tags

NGSS.HS-PS1-7

As the electronegativity difference between 2 atoms increases, the polarity of the bond ____________________

• increases

• decreases

What type of bond forms between hydrogen and chlorine?

• polar covalent

• non-polar covalent

• ionic

• hydrogen bond

Asymmetry in molecules make them...

• Polar

• Nonpolar

• Super polar

Tags

NGSS.HS-PS1-1

Identify the hybridization of carbon in CH₄.

• sp³

• sp

• sp²

Determine the number of sigma and pi bonds in the molecule pictured:

• 13 sigma, 1 pi

• 14 sigma, 2 pi

• 1 sigma, 14 pi

• 2 sigma, 13 pi

Choose the correct shape for this molecule:

• Trigonal planar
• Trigonal pyramidal
• Tetrahedral
• Linear

Bronze is a(n) ______ alloy.

• Interstitial

• Inverted

• Substitutional

• Subterranean

Which of the following substances will have the highest melting point? Hint - think about lattice energy and Coulomb's Law.

• KCl

• KF

• BeCl₂

• BeF₂

Answer explanation

Magnesium has a larger charge (+2) compared to sodium (+1). The fluorine ion will be much smaller than chlorine, and therefore, the ions will be more tightly packed (and harder to separate) in MgF2.

Tags

NGSS.HS-PS2-4