Chemistry HESI A2 Practice Test

HESI A2

HESI A2 Test Bank

What is the correct electron configuration for lithium?

A. 1s�2s� B. 1s�2s� C. 1s�2s�2p� D. 1s�2s�2p�

How many neutrons are in an atom of uranium-235?

A. 92 B. 125 C. 143 D. 235

What is the oxidation state of the chlorine atom in the compound HCl?

A. +1 B. -1 C. +2 D. -2

Radioactive isotopes are frequently used in medicine. What kind of half-life would a medical isotope probably have?

A. Seconds-long B. Days-long C. Years-long D. Many years long

How many times more acidic is a substance with a pH of 3 compared to a substance with a pH of 5?

A. 8 B. 2 C. 100 D. 1,000