Chem 121 Exam 1 Test Bank Solved Questions 100 Percent Correct Answers

CHEM 121 EXAM 1 TEST BANK SOLVED QUESTIONS 100 PERCENT CORRECT ANSWERS
CHEM 121 EXAM 1 Questions and Answers Verified
Solutions Latest Update 2026/2027

Question:
The correct answer for the addition of 7.5 g + 2.26 g + 1.311 g + 2 g is

Answer:
13g (NOT 13.071g)



Question:
A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a
volume of 77.0 mL. What is the density of the gold?

Answer:
19.3g/mL



Question:
Diamond has a density of 3.52 g/mL. What is the volume in cubic centimeters of a diamond with a
mass of 15.1 g?

Answer:
4.29 cm^3



Question:
Identify each of the following transformations as a chemical or physical change.

Answer:
Water evaporating= physical A button falling off a shirt= physical Silver tarnishing= chemical
Cutting the grass= physical A nail rusting= chemical



Question:

, Sulfur is a non-metal

Answer:
True



Question:
An electron has a positive charge

Answer:
False



Question:
Isotopes have the same atomic number but different mass numbers.

Answer:
True



Question:
Which of the following descriptions of a subatomic particle is correct?

Answer:
A neutron has no charge and its mass is negligible. An electron has a negative charge and a mass of
approximately 1 amu. A neutron has a positive charge and a mass of approximately 1 amu. A proton
has a positive charge and a negligible mass. (A proton has a positive charge and a mass of
approximately 1 amu.)



Question:
What is the mass number of an atom of potassium that has 20 neutrons?

Answer:
39