MSU CEM 141 Exam-Question with Correct Answers/ Verified
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Course
MSU CEM 141
Institution
MSU CEM 141
The statement "If I add cold milk to hot coffee the temperature will decrease," is a? -️️Claim,
always include an explanation and reasoning to the claim.
Scientific Model -️️Models are used to make testable predictions
How much is a picometer? -️️0.1 x 10^-12 meters
Atomic Force Mic...
MSU CEM 141 Exam-Question with Correct Answers/ Verified
The statement "If I add cold milk to hot coffee the temperature will decrease," is a? - ✔️✔️Claim,
always include an explanation and reasoning to the claim.
Scientific Model - ✔️✔️Models are used to make testable predictions
How much is a picometer? - ✔️✔️0.1 x 10^-12 meters
Atomic Force Microscopy/ Scanning Tunneling Microscopy - ✔️✔️Microscopes that now allows us
to view atoms.
Leaves are green in the summer because? - ✔️✔️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? - ✔️✔️91
What was Dalton's Atomic theory? (1808) - ✔️✔️- 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? - ✔️✔️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)
What was Ernest Rutherford's experiment, what did he discover? - ✔️✔️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? - ✔️✔️A law describes - tells you what happens
A theory explains - tells you why it happens
How big is an atom (H)? - ✔️✔️About 0.1 nanometer (0.1 x 10-9m)
Which is biggest? Atom, Molecule, Cell, or it depends? - ✔️✔️
Where did the idea of atoms come from? - ✔️✔️The Greeks
Atoms - ✔️✔️The smallest unit of an element
What is the evidence from Thomson's experiment that all atoms contain electrons? - ✔️✔️The
particles are identical regardless of the identity of the cathode(where they were emitted from).
What is an alpha particle? - ✔️✔️Has 2 protons and 2 neutrons. It is the nucleus of a Helium atom.
Coulomb's Law - ✔️✔️Negative and positive charges attract and like charges repel.
Gravitational Force - ✔️✔️Responsible for attraction between objects that have mass.
Electromagnetic Force - ✔️✔️Responsible for attraction/repulsion for objects that have an electric
charge.
Kinetic Energy - ✔️✔️The energy associated with motion.
Potential Energy - ✔️✔️The energy associated with the position of a system of objects in a field.
, London Dispersion Forces - ✔️✔️
How many molecules must be present for LDF's to exist? - ✔️✔️Two or more
As the helium atoms approach what happens to the total energy? - ✔️✔️Stays the same
As the helium atoms approach what happens to the kinetic energy? - ✔️✔️Increases
As the helium atoms approach what happens to the potential energy? - ✔️✔️Decreases
What happens to the total energy when the atoms get close to overlapping electron clouds? -
✔️✔️Stays the same
What happens to the kinetic energy when the atoms get close to overlapping the electron clouds? -
✔️✔️Decreases
What happens to the potential energy when the atoms overlap electron clouds? - ✔️✔️Increases
Are gravitational forces meditated by fields? - ✔️✔️True
Do gravitational forces require 2 or more objects? - ✔️✔️True
Are gravitational forces always attractive? - ✔️✔️True
Do gravitational forces increase as distance between the objects increase? - ✔️✔️False
Do gravitational forces increase as the mass of the object increases? - ✔️✔️True
Are electrostatic forces meditated by fields? - ✔️✔️True
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