MSU CEM 141 ACTUAL 2025 FINAL EXAM WITH QUESTIONS AND CORRECT VERIFIED
ANSWERS GRADED A+ GUARANTEED PASS
The statement "If I add cold milk to hot coffee the temperature will decrease," is a? - (answer)Claim,
always include an explanation and reasoning to the claim.
Scientific Model - (answer)Models are used to make testable predictions
How much is a picometer? - (answer)0.1 x 10^-12 meters
Atomic Force Microscopy/ Scanning Tunneling Microscopy - (answer)Microscopes that now allows us to
view atoms.
Leaves are green in the summer because? - (answer)A plant's leaves are green in the summer because
they contain chlorophyll. Chlorophyll is a natural pigment that absorbs all wavelengths in the visible
spectrum except green.
How many naturally occurring elements exist? - (answer)91
What was Dalton's Atomic theory? (1808) - (answer)- Elements are composed of small particles called
Atoms.
- Atoms of a given element are different from atoms of other elements.
-Chemical reactions happen when atoms are rearranged.
- Compounds contain 2 or more elements.
What was J.J. Thomson's experiment, and what did he discover? - (answer)Using a Cathode Ray Tube, he
noticed that particles emerged to the cathode disk, and moved to another, the anode. These particles
could be deflected by electrical fields that would indicate that they would be negatively charged. They
were also deflected by magnetic fields, which showed the particles carried the charge as the ray was
bent. The most important observation was that the type of cathode used did not matter, as these
particles were still emitted. Therefore, Thomson deduced that the particles were universal and were in
fact negatively charged components of the atom. (The Electron)
,MSU CEM 141 ACTUAL 2025 FINAL EXAM WITH QUESTIONS AND CORRECT VERIFIED
ANSWERS GRADED A+ GUARANTEED PASS
What was Ernest Rutherford's experiment, what did he discover? - (answer)Ernest Rutherford fired
Alpha particles (Hydrogen atoms) at a thin sheet of gold foil. Had Thomson's theory been right about the
plum pudding model, then the atoms should have all passed right through the sheet with no exceptions.
However, a small ratio of these particles were deflected. With this information, Rutherford figured there
was a small dense nucleus in the atom and that most of the atom was empty space.
What is the difference between Law and Theory? - (answer)A law describes - tells you what happens
A theory explains - tells you why it happens
How big is an atom (H)? - (answer)About 0.1 nanometer (0.1 x 10-9m)
Which is biggest? Atom, Molecule, Cell, or it depends? - (answer)It depends on the weight or collection
of atoms in a molecule, but most of the time, a cell would be the largest out of the 3 options
Where did the idea of atoms come from? - (answer)The Greeks
Atoms - (answer)The smallest unit of an element
What is the evidence from Thomson's experiment that all atoms contain electrons? - (answer)The
particles are identical regardless of the identity of the cathode(where they were emitted from).
What is an alpha particle? - (answer)Has 2 protons and 2 neutrons. It is the nucleus of a Helium atom.
Coulomb's Law - (answer)Negative and positive charges attract and like charges repel.
4 Types of Forces - (answer)Gravitational, Electromagnetic, Strong Nuclear, Weak Nuclear
Gravitational Force - (answer)Responsible for attraction between objects that have mass.
, MSU CEM 141 ACTUAL 2025 FINAL EXAM WITH QUESTIONS AND CORRECT VERIFIED
ANSWERS GRADED A+ GUARANTEED PASS
Electromagnetic Force - (answer)Responsible for attraction/repulsion for objects that have an electric
charge.
Kinetic Energy - (answer)The energy associated with motion.
Potential Energy - (answer)The energy associated with the position of a system of objects in a field.
London Dispersion Forces - (answer)The intermolecular attractions resulting from the constant motion
of electrons and the creation of instantaneous dipoles
How many molecules must be present for LDF's to exist? - (answer)Two or more
As the helium atoms approach what happens to the total energy? - (answer)Stays the same
As the helium atoms approach what happens to the kinetic energy? - (answer)Increases
As the helium atoms approach what happens to the potential energy? - (answer)Decreases
What happens to the total energy when the atoms get close to overlapping electron clouds? -
(answer)Stays the same
What happens to the kinetic energy when the atoms get close to overlapping the electron clouds? -
(answer)Decreases
What happens to the potential energy when the atoms overlap electron clouds? - (answer)Increases
Are gravitational forces meditated by fields? - (answer)True
ANSWERS GRADED A+ GUARANTEED PASS
The statement "If I add cold milk to hot coffee the temperature will decrease," is a? - (answer)Claim,
always include an explanation and reasoning to the claim.
Scientific Model - (answer)Models are used to make testable predictions
How much is a picometer? - (answer)0.1 x 10^-12 meters
Atomic Force Microscopy/ Scanning Tunneling Microscopy - (answer)Microscopes that now allows us to
view atoms.
Leaves are green in the summer because? - (answer)A plant's leaves are green in the summer because
they contain chlorophyll. Chlorophyll is a natural pigment that absorbs all wavelengths in the visible
spectrum except green.
How many naturally occurring elements exist? - (answer)91
What was Dalton's Atomic theory? (1808) - (answer)- Elements are composed of small particles called
Atoms.
- Atoms of a given element are different from atoms of other elements.
-Chemical reactions happen when atoms are rearranged.
- Compounds contain 2 or more elements.
What was J.J. Thomson's experiment, and what did he discover? - (answer)Using a Cathode Ray Tube, he
noticed that particles emerged to the cathode disk, and moved to another, the anode. These particles
could be deflected by electrical fields that would indicate that they would be negatively charged. They
were also deflected by magnetic fields, which showed the particles carried the charge as the ray was
bent. The most important observation was that the type of cathode used did not matter, as these
particles were still emitted. Therefore, Thomson deduced that the particles were universal and were in
fact negatively charged components of the atom. (The Electron)
,MSU CEM 141 ACTUAL 2025 FINAL EXAM WITH QUESTIONS AND CORRECT VERIFIED
ANSWERS GRADED A+ GUARANTEED PASS
What was Ernest Rutherford's experiment, what did he discover? - (answer)Ernest Rutherford fired
Alpha particles (Hydrogen atoms) at a thin sheet of gold foil. Had Thomson's theory been right about the
plum pudding model, then the atoms should have all passed right through the sheet with no exceptions.
However, a small ratio of these particles were deflected. With this information, Rutherford figured there
was a small dense nucleus in the atom and that most of the atom was empty space.
What is the difference between Law and Theory? - (answer)A law describes - tells you what happens
A theory explains - tells you why it happens
How big is an atom (H)? - (answer)About 0.1 nanometer (0.1 x 10-9m)
Which is biggest? Atom, Molecule, Cell, or it depends? - (answer)It depends on the weight or collection
of atoms in a molecule, but most of the time, a cell would be the largest out of the 3 options
Where did the idea of atoms come from? - (answer)The Greeks
Atoms - (answer)The smallest unit of an element
What is the evidence from Thomson's experiment that all atoms contain electrons? - (answer)The
particles are identical regardless of the identity of the cathode(where they were emitted from).
What is an alpha particle? - (answer)Has 2 protons and 2 neutrons. It is the nucleus of a Helium atom.
Coulomb's Law - (answer)Negative and positive charges attract and like charges repel.
4 Types of Forces - (answer)Gravitational, Electromagnetic, Strong Nuclear, Weak Nuclear
Gravitational Force - (answer)Responsible for attraction between objects that have mass.
, MSU CEM 141 ACTUAL 2025 FINAL EXAM WITH QUESTIONS AND CORRECT VERIFIED
ANSWERS GRADED A+ GUARANTEED PASS
Electromagnetic Force - (answer)Responsible for attraction/repulsion for objects that have an electric
charge.
Kinetic Energy - (answer)The energy associated with motion.
Potential Energy - (answer)The energy associated with the position of a system of objects in a field.
London Dispersion Forces - (answer)The intermolecular attractions resulting from the constant motion
of electrons and the creation of instantaneous dipoles
How many molecules must be present for LDF's to exist? - (answer)Two or more
As the helium atoms approach what happens to the total energy? - (answer)Stays the same
As the helium atoms approach what happens to the kinetic energy? - (answer)Increases
As the helium atoms approach what happens to the potential energy? - (answer)Decreases
What happens to the total energy when the atoms get close to overlapping electron clouds? -
(answer)Stays the same
What happens to the kinetic energy when the atoms get close to overlapping the electron clouds? -
(answer)Decreases
What happens to the potential energy when the atoms overlap electron clouds? - (answer)Increases
Are gravitational forces meditated by fields? - (answer)True
