CHEM 160 Exam 3

Electrons are ___________ in ionic compounds.

• shared

• completely transferred

• delocalized

• ionic

Tags

NGSS.HS-PS1-1

True or false: Ionic compounds have a high melting and boiling point.

• true

• false

True or false: covalent compounds are hard and brittle.

• true

• false

1. Ionic compounds are insulators in the __________ phase and conductors in the ________ phase.

• solid, liquid/aqueous

• gas, liquid

• hard, soft

• solid, conductor

True or false: in metallic compounds, metals are bonded to another nonmetal.

• true

• false

Metals are excellent ___________ which means they let electricity pass through it easily.

• insulators

• compounds

• bonders

• conductors

Covalent compounds are also called ______.

• molecules

• resonance structures

• ions

• networks

Most elements obey the octet rule, which means they want _____ valence electrons.

• 12

• 2

• 7

• 8

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many valence electrons does sulfur have?

• 5

• 6

• 12

• 3

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element is an example of a hypervalent central atom?

• xenon

• nitrogen

• carbon

• oxygen