Chemistry Semester Review

The name of this molecular shape is

• Bent
• trigonal planar
• Pyramidal
• Tetrahedral

Which of the following is a typical property of metals?

• Malleability 
• Brittleness
• Poor electrical conductivity
• Low melting point

A bond in which two pairs of electrons are shared

• Single covalent bond
• Double covalent bond
• Triple covalent bond
• Electronic bond

Which of the following pairs of elements can be joined by a covalent bond?

• Na and C
• Mg and C
• Li and Cl
• N and C

Which principle states that atoms tend to form compounds so that each atom can have eight electrons in its outermost energy level?

• Rule of eights
• Avogadro principle
•  Configuration rule
• Octet rule

The name of this molecular shape is

• Bent
• Pyramidal
• trigonal planar
• Tetrahedral

Substances with ___ bonds never dissolve in water.

• Polar covalent
• Ionic
• Nonpolar covalent
• Metallic

Bonds that have an electronegativity less than 0.4 

• Ionic
• Polar covalent
• Nonpolar covalent
• Metallic

CO₂ is composed of carbon and oxygen.  Carbon’s electronegativity is 2.5 and oxygen’s is 3.5.  The bond type would be

• Ionic
• polar covalent
• nonpolar covalent
• Metallic

What are electrons in the outermost energy level of an atom called?  

• low energy electrons  
• shell electrons 
•  valence electrons  
• protons