CHEM 219 MODULES 1–8 & FINAL EXAM:
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. What is the definition of mass in scientific terms?
Mass is a measure of the amount of matter in an object.
Mass is the force exerted by gravity on an object.
Mass is the energy contained in an object.
Mass is the volume occupied by an object.
2. Describe the process by which phosphorus (P) forms a simple ion and the
significance of its charge.
Phosphorus gains two electrons to form a P^2- ion, which is
significant for its reactivity.
Phosphorus loses one electron to form a P^1+ ion, which is
significant for its bonding properties.
Phosphorus typically gains three electrons to form a P^3- ion,
which is significant because it achieves a stable electron
configuration.
Phosphorus loses three electrons to form a P^3- ion, which is
significant because it becomes positively charged.
3. What charge does the simple ion formed from nitrogen (N) typically have
when it ionizes?
+5
-3
+3
, 0
4. What is the charge of the simple ion formed when beryllium (Be) ionizes?
, 0
3+
2+
1+
5. Select the best definition for the term mass (m).
The resistance that an object offers to a change in its state of
motion
The amount of matter an object possesses within its physical
boundaries
The push or pull acting on an object
6. Describe the steps involved in converting a temperature from Fahrenheit
to Kelvin.
Convert Fahrenheit to Kelvin by subtracting 32 and multiplying by
5/9.
Convert Fahrenheit to Celsius, then multiply by 273.15 to get Kelvin.
First, convert Fahrenheit to Celsius using C = (F - 32) × 5/9, then
convert Celsius to Kelvin by adding 273.15.
Convert Fahrenheit directly to Kelvin using K = (F - 32) × 5/9 + 273.15.
7. Which of the following is the most probable ion formed by an atom of
nitrogen?
N2+
N2-
N3-
N3+
, 8. How many valence electrons does bromine (Br) have?
8
5
3
7
9. The anion formed when nitrogen gains three electrons is the
nitride ion
nitro ion
nitrite ion
nitrogide ion
10. Given the graph, what can be predicted from the ionization energy and
the atomic numbers of elements in period 2?
The ionization energy increases with an increase in the atomic
number across the period.
The atomic number and ionization energy show no correlation at
all.
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. What is the definition of mass in scientific terms?
Mass is a measure of the amount of matter in an object.
Mass is the force exerted by gravity on an object.
Mass is the energy contained in an object.
Mass is the volume occupied by an object.
2. Describe the process by which phosphorus (P) forms a simple ion and the
significance of its charge.
Phosphorus gains two electrons to form a P^2- ion, which is
significant for its reactivity.
Phosphorus loses one electron to form a P^1+ ion, which is
significant for its bonding properties.
Phosphorus typically gains three electrons to form a P^3- ion,
which is significant because it achieves a stable electron
configuration.
Phosphorus loses three electrons to form a P^3- ion, which is
significant because it becomes positively charged.
3. What charge does the simple ion formed from nitrogen (N) typically have
when it ionizes?
+5
-3
+3
, 0
4. What is the charge of the simple ion formed when beryllium (Be) ionizes?
, 0
3+
2+
1+
5. Select the best definition for the term mass (m).
The resistance that an object offers to a change in its state of
motion
The amount of matter an object possesses within its physical
boundaries
The push or pull acting on an object
6. Describe the steps involved in converting a temperature from Fahrenheit
to Kelvin.
Convert Fahrenheit to Kelvin by subtracting 32 and multiplying by
5/9.
Convert Fahrenheit to Celsius, then multiply by 273.15 to get Kelvin.
First, convert Fahrenheit to Celsius using C = (F - 32) × 5/9, then
convert Celsius to Kelvin by adding 273.15.
Convert Fahrenheit directly to Kelvin using K = (F - 32) × 5/9 + 273.15.
7. Which of the following is the most probable ion formed by an atom of
nitrogen?
N2+
N2-
N3-
N3+
, 8. How many valence electrons does bromine (Br) have?
8
5
3
7
9. The anion formed when nitrogen gains three electrons is the
nitride ion
nitro ion
nitrite ion
nitrogide ion
10. Given the graph, what can be predicted from the ionization energy and
the atomic numbers of elements in period 2?
The ionization energy increases with an increase in the atomic
number across the period.
The atomic number and ionization energy show no correlation at
all.
