Chem 101 Chapter 2 Exam Question &
Answers ( Latest 2025 )
Dalton's Atomic Theory - CORRECT ANSWERS ✔✔1. Each element is
composed of small particles called atoms.
2. All atoms of an element are identical, but the atoms of one element
differ from atoms of all other elements.
3. Atoms of one element cannot be changed into atoms of another
element. Atoms can neither be created nor destroyed.
4. Compounds are formed of elements and only exist in the same
relative number and kind of atoms.
Law of Conservation of Mass - CORRECT ANSWERS ✔✔the total
mass of substances present at the end of a chemical process is the
same as the mass of substances present before the process took place
J.J. Thomson - CORRECT ANSWERS ✔✔discovered the electron from
cathode tubes in 1897, its charge is 1.76x10^8 (C/g)
Millikan Oil-drop Experiment - CORRECT ANSWERS ✔✔used to
determine the charge of the electron, Robert Millikan 1909
Radioactivity - CORRECT ANSWERS ✔✔the spontaneous emission of
radiation by an atom, observed first by Henri Becquerel
Rutherford - CORRECT ANSWERS ✔✔discovered 3 types of
radiation:
, Chem 101 Chapter 2 Exam Question &
Answers ( Latest 2025 )
1. alpha particles (+)
2. beta rays (-)
3. gamma rays (neutral)
Plum Pudding Model - CORRECT ANSWERS ✔✔model of the atom
by Thomson, featured a positive sphere of matter with negative
electrons imbedded in it
Nucleus - CORRECT ANSWERS ✔✔discovered when Rutherford shot
alpha particles at a sheet of gold foil and observed the pattern of
scatter of the particles,
Nuclear atom - CORRECT ANSWERS ✔✔Rutherford postulated a
very small, dense nucleus with electrons around the outside of the
atom
Protons - CORRECT ANSWERS ✔✔discovered by Rutherford in 1919
Neutrons - CORRECT ANSWERS ✔✔discovered by James Chadwick
in 1932
Atomic Number - CORRECT ANSWERS ✔✔number of protons in an
atom
Answers ( Latest 2025 )
Dalton's Atomic Theory - CORRECT ANSWERS ✔✔1. Each element is
composed of small particles called atoms.
2. All atoms of an element are identical, but the atoms of one element
differ from atoms of all other elements.
3. Atoms of one element cannot be changed into atoms of another
element. Atoms can neither be created nor destroyed.
4. Compounds are formed of elements and only exist in the same
relative number and kind of atoms.
Law of Conservation of Mass - CORRECT ANSWERS ✔✔the total
mass of substances present at the end of a chemical process is the
same as the mass of substances present before the process took place
J.J. Thomson - CORRECT ANSWERS ✔✔discovered the electron from
cathode tubes in 1897, its charge is 1.76x10^8 (C/g)
Millikan Oil-drop Experiment - CORRECT ANSWERS ✔✔used to
determine the charge of the electron, Robert Millikan 1909
Radioactivity - CORRECT ANSWERS ✔✔the spontaneous emission of
radiation by an atom, observed first by Henri Becquerel
Rutherford - CORRECT ANSWERS ✔✔discovered 3 types of
radiation:
, Chem 101 Chapter 2 Exam Question &
Answers ( Latest 2025 )
1. alpha particles (+)
2. beta rays (-)
3. gamma rays (neutral)
Plum Pudding Model - CORRECT ANSWERS ✔✔model of the atom
by Thomson, featured a positive sphere of matter with negative
electrons imbedded in it
Nucleus - CORRECT ANSWERS ✔✔discovered when Rutherford shot
alpha particles at a sheet of gold foil and observed the pattern of
scatter of the particles,
Nuclear atom - CORRECT ANSWERS ✔✔Rutherford postulated a
very small, dense nucleus with electrons around the outside of the
atom
Protons - CORRECT ANSWERS ✔✔discovered by Rutherford in 1919
Neutrons - CORRECT ANSWERS ✔✔discovered by James Chadwick
in 1932
Atomic Number - CORRECT ANSWERS ✔✔number of protons in an
atom
