Review for Gen. Chem. Fall Final Exam

Determine the average atomic mass and which element X is (BE SURE TO INCLUDE UNIT). Then identify the element.

X-63 has an abundance of 70%

X-65 has an abundance of 30%

• 6,360 amu, No element has a mass this high

• 859.95 amu, No element has a mass this high

• 63.6 amu, Copper (Cu)

• 64.4 amu, Zinc (Zn)

Name the ionic compound NaCl.

• Sodium Chlorine

• Sodium Chloride

• Monosodium Monochloride

• Sodium Monochloride

Name the covalent compound H₃N

• Trihydrogen Mononitride

• Hydrogen Mononitride

• Trihydrogen Nitride

• Hydrogen-3 Nitride

What is the correct ionic formula when Calcium (Ca) bonds with Phosphorus (P)?

• CaP

• Ca₃P₂

• Ca₂P₃

• PCa

What is the formula for the covalent compound Dicarbon Heptasulfide

• C₇S₂

• CS

• C₂S₇

• S₇C₂

How can you determine how many valence electrons an element has?

• The row it is in

• It's atomic number

• It's atomic mass

• The column it is in

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which pictures shows the correct lewis dot structure for Nitrogen (N)?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

How many neutrons does the isotope Calcium (Ca) - 45 have?

• 45

• 20

• 25

• 21

Oxygen is a colorless gas, is an example of what?

• Physical change

• Chemical change

• Physical Property

• Chemical Property

Plastic melting is an example of what?

• Physical Change

• Chemical Change

• Physical Property

• Chemical Property

Tags

NGSS.MS-PS1-4