GENERAL ORGANIC AND BIOLOGICAL
CHEMISTRY COMPREHENSIVE EXAM
SCRIPT VERIFIED QUESTIONS AND
SOLUTIONS GRADED APLUS
●● A ZERO is not a significant figure if ------>
Answer: - if its at the beginning of a decimal number
- A placeholder in a large number without a decimal point
●● What happens during alpha decay?
Answer: The mass number of the isotope produced decreases by four
and the atomic number decreases by two.
Mass number -4
Atomic number -2
●● What are isotopes
Answer: They are atoms with identical atomic numbers but with
different mass numbers. ( atoms with the same number of protons but
different number of neurons.)
●● Elements
Answer: Pure substances that consist of only one type of an atom.
, ●● Gamma Decay
Answer: Will not change the mass number or the atomic number of the
product.
●● Physical Change
Answer: Does not change the composition or identity of a substance
Example: Change of state, temp changes, dissolving
●● Mass
Answer: The amount of material (matter) in a substance.
●● What does the nucleus of an atom contain?
Answer: Protons and neutrons
●● AMU mean --->
Answer: Atomic Mass Unit
●● Which state of matter has the lowest kinetic energy?
Answer: Solids
●● What does a chemical formula tell you?
CHEMISTRY COMPREHENSIVE EXAM
SCRIPT VERIFIED QUESTIONS AND
SOLUTIONS GRADED APLUS
●● A ZERO is not a significant figure if ------>
Answer: - if its at the beginning of a decimal number
- A placeholder in a large number without a decimal point
●● What happens during alpha decay?
Answer: The mass number of the isotope produced decreases by four
and the atomic number decreases by two.
Mass number -4
Atomic number -2
●● What are isotopes
Answer: They are atoms with identical atomic numbers but with
different mass numbers. ( atoms with the same number of protons but
different number of neurons.)
●● Elements
Answer: Pure substances that consist of only one type of an atom.
, ●● Gamma Decay
Answer: Will not change the mass number or the atomic number of the
product.
●● Physical Change
Answer: Does not change the composition or identity of a substance
Example: Change of state, temp changes, dissolving
●● Mass
Answer: The amount of material (matter) in a substance.
●● What does the nucleus of an atom contain?
Answer: Protons and neutrons
●● AMU mean --->
Answer: Atomic Mass Unit
●● Which state of matter has the lowest kinetic energy?
Answer: Solids
●● What does a chemical formula tell you?
