Chem Exam Pt 2

Acids, Bases, and Solutions

100

How does ocean acidification affect sea life in the ocean? 

A. Helps plants and animals survive better in the ocean

B. Ocean acidification does not affect sea life in the ocean

C. Changes the ecosystem (environment where plants and animals live)

D. H2O

C. Changes the ecosystem (environment where plants and animals live)

200

 The pH of seawater is _____. 

A. 8.1

B. 6.5

C. 4.6

D. 7.0

A. 8.1

Chemical Formulas, Reactions, and Bonding

100

Which of the following molecules are polar? 

A. C2H4

B. NH3

C. CH4

D. CO2

B. NH3

200

Which of these molecules has three substituents on its central atom? 

A. NH3

B. CO2

C. CH4

D. CH20

A. NH3

300

What is the bond angle formed around a central atom with two substituents? 

A. 109.5∘

B. 180∘

C. 90∘

D. 120∘

A. 109.5∘

400

Which of the following would be expected to conduct electricity when added to water?  

A. CH4

B. H2O

C. C2H6

D. MgCl2

D. MgCl2

500

Which list of coefficients will balance this equation: ___CH4+___O2→___CO2+___H2O

A. 2, 1, 2, 1

B. 1, 1, 1, 2  

C. 2, 2, 2, 1

D. 1, 2, 1, 2

B. 1, 1, 1, 2 

Atomic Structure and the Periodic Table

100

The following question pertains to the atom Selenium (Se). How many valence electrons does Se have? 

A. 4

B. 5

C. 6

D. 16

C. 6

200

The following question pertains to the atom Selenium (Se). If Selenium were to form an ion, what would be its charge? 

A. +1

B. +2

C. -1

D. -2

D. -2

300

Which of the following would have the largest ionization energy? 

A. Chlorine (Cl)

B. Bromine (Br)

C. Sulfur (S)

D. Selenium (Se))

C. Sulfur (S)

400

30. Which of these elements is a halogen? 

A. Argon

B. Bromine

C. Oxygen

D. Nitrogen

B. Bromine

500

When forming a molecule, which of the following will typically form two bonds?

A. Oxygen

B. Chlorine

C. Argon

D. Carbon

D. Carbon

Misc.

100

How many bonds will Neon typically make?

A. 0

B. 1

C. 2

D. 3  

A. 0

200

Which versions of the Periodic Table groups elements with similar properties in the same columns? 

A. The modern model

B. Mendeleev's model

C. Both models

D. Neither model

C. Both models

300

On the Periodic Table, the number 12.011 appears at the bottom of the box labeled C (carbon). To what does this number refer?

A. The isotopic number

B. The Atomic Mass

C. The Atomic Number

D. The ionic number

B. The Atomic Mass

400

In the manufacturing of electronic devices, a thin wafer of pure solid silicon is placed in a chamber full of gaseous silicon nitride (Si3N4), leaving a thin layer of solid silicon nitride on the wafer. What phase change is this an example of? 

A. Melting

B. Boiling

C. Deposition

D. Sublimation

D. Sublimation

500

Which of these is not made of submicroscopic particles?

A. a fish

B. sound

C. wood

D. hair

B. sound