ACS Review #3

Which is NOT named correctly?

• MnO₂

  manganese(II) oxide

• CuSO₄

  copper(II) sulfate

• Na₃PO₄

  sodium phosphate

• CaF₂

  calcium fluoride

Precision is determined by calculating the ___________, while accuracy is determined by calculating the _________________.

• percent error; standard deviation

• standard deviation; mean

• standard deviation; percent error

• mean; percent error

Which microscopic representation best represents a solution?

• 
• 
• 
• 

How many neutrons are in ³⁷₁₇Cl^-?

• 17

• 20

• 21

• 37

Tags

NGSS.MS-PS1-1

Two isotopes of hypothetical element X exist with abundances of 30.00% ¹⁰⁰X and 70.00% ¹⁰¹X. What is the approximate atomic mass of X (in atomic units, amu)?

• 100.3

• 100.5

• 100.7

• 101

What is the energy of a photon with a wavelength (λ) of 656 nm?

• 3.03 x 10^-19 J

• 3.03 x 10^-28 J

• 4.35 x 10^-31 J

• 4.35 x 10^-40 J

Tags

NGSS.HS-PS4-1

The radii of the ions in this series decreases because

• the elements are in the same period.

• the effective nuclear charge is increasing.

• the atomic radius of Na decreases from Na to Al.

• the first ionization energies increase from Na to Al

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the maximum number of electrons that can occupy an orbital labeled d_xy?

• 1

• 2

• 3

• 4

A single tablet of regular strength Tylenol contains 0.325 g of acetaminophen (C₈H₉NO₂). How many moles of acetaminophen are in a single tablet of Tylenol? (Molar mass of C₈H₉NO₂ = 151.2 g⋅mol^-1)

• 2.15 x 10^-3

• 0.465

• 2.15

• 465.

A molecular compound is found to consist of 30.4% nitrogen and 69.6% oxygen. If the molecule contains 2 atoms of nitrogen, what is the molar mass of the molecule?

• 46 g⋅mol^-1

• 92 g⋅mol^-1

• 154 g⋅mol^-1

• 168 g⋅mol^-1