CHEM 131: EXAM 1 | 2025/26 UPDATE | QUESTIONS
AND ANSWERS | 100% CORRECT!!
All of the following are examples of matter except Answer - heat
Which of the following is a physical property? Answer - conductivity
Which term does not describe a conversion between states of matter? Answer
- Mixing
Which of the following observations demonstrates that a solid sample is a
compound? Answer - It cannot be broken down into simpler substances by
physical methods.
Which of the following is an element Answer - Iron
Xylene, a compound with the formula C8H10, is composed of Answer - Eight
atoms of carbon and 10 atoms of hydrogen
How many meters are there in 1 kilometer? Answer - 10^3
Which measurement represents the largest quantity? Answer - 47.3 mg
The metric unit used to measure volume is the Answer - liter
, Which of the following numbers contains four significant figures? Answer -
0.002301
The numerical value for (5.6 x 10^4) / (7.89 x 10^2) is equal to, with the proper
number of significant figures: Answer - 71
How many inches are contained in 25.4 cm? Answer - 10.0 inches
How many pounds are contained in 84 kg? Answer - 185 lb
What temperature is 325 K on the Celsius scale? Answer - 52°C
The smallest amount of an element that retains that elements characteristics is
the Answer - Atom
Where is the most of the mass of an atom concentrated? Answer - Nucleus
The value of Z for an atom containing 47 protons, 47 electrons, and 60
neutrons is Answer - 47
The number of neutrons in an atom is equal to Answer - mass number - atomic
number
Cobalt is element 27. Cobalt-60 is used in the medical treatment of cancer.
How many neutrons and protons are contained in the nucleus of this isotope?
Answer - 33 neutrons, 27 protons
AND ANSWERS | 100% CORRECT!!
All of the following are examples of matter except Answer - heat
Which of the following is a physical property? Answer - conductivity
Which term does not describe a conversion between states of matter? Answer
- Mixing
Which of the following observations demonstrates that a solid sample is a
compound? Answer - It cannot be broken down into simpler substances by
physical methods.
Which of the following is an element Answer - Iron
Xylene, a compound with the formula C8H10, is composed of Answer - Eight
atoms of carbon and 10 atoms of hydrogen
How many meters are there in 1 kilometer? Answer - 10^3
Which measurement represents the largest quantity? Answer - 47.3 mg
The metric unit used to measure volume is the Answer - liter
, Which of the following numbers contains four significant figures? Answer -
0.002301
The numerical value for (5.6 x 10^4) / (7.89 x 10^2) is equal to, with the proper
number of significant figures: Answer - 71
How many inches are contained in 25.4 cm? Answer - 10.0 inches
How many pounds are contained in 84 kg? Answer - 185 lb
What temperature is 325 K on the Celsius scale? Answer - 52°C
The smallest amount of an element that retains that elements characteristics is
the Answer - Atom
Where is the most of the mass of an atom concentrated? Answer - Nucleus
The value of Z for an atom containing 47 protons, 47 electrons, and 60
neutrons is Answer - 47
The number of neutrons in an atom is equal to Answer - mass number - atomic
number
Cobalt is element 27. Cobalt-60 is used in the medical treatment of cancer.
How many neutrons and protons are contained in the nucleus of this isotope?
Answer - 33 neutrons, 27 protons
