Chemistry Final Exam Review

If astatine-209 (atomic number 85) decays via alpha decay, what isotope will result?

• ₈₃²⁰⁵Bi

• ₈₆²⁰⁹Rn

• ₈₁²⁰⁷Tl

• ₈₅²⁰⁸At

Tags

NGSS.HS-PS1-8

Emission of light from an atom occurs when an electron

• drops from a higher to a lower energy level.

•    jumps from a lower to a higher energy level.   

•    moves within its atomic orbital.

• falls into the nucleus.

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Tags

NGSS.HS-PS1-1

The following is the electron configuration for what element?

[Xe] 6s² 4f¹⁴ 5d⁹

• mercury

• gold

• platinum

• thallium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu

• 24.97 amu

• 75.01 amu

• 74.51 amu

Which atom has the largest atomic radius?

• potassium

• calcium

• rubidium

• strontium

For which of the following would hydrogen bonding occur between molecules?

• 
• 
• 
• 

Which is the correct net ionic equation for the reaction of AgNO₃ and CaCl₂?

• Ca²⁺(aq) +  2Cl^- (aq) → CaCl(s)

• Ag⁺(aq)  +  Cl^- (aq) → AgCl(s)

• Ag +  Cl  →  AgCl

• Ag⁺  +  Ca²⁺   →Ag₂Ca (s)

Tags

NGSS.HS-PS1-7

How many mL of stock solution of 2.0 M NaCl do you need to prepare 100.0 mL of 0.150 M NaCl?

• 7.5 mL

• 15 mL

• 1300 mL

• 200 mL

What is the molarity in 650. ml of solution containing 63 grams of sodium chloride?

• 2.4 M

• 0.86 M

• 1.7 M

• 0.54 M