MSU CEM 141 Exam-Question with Correct Answers/ Verified
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Course
MSU CEM 141
Institution
MSU CEM 141
Claim, always include an explanation and reasoning to the claim. -️️The statement "If I add cold
milk to hot coffee the temperature will decrease," is a?
Models are used to make testable predictions -️️Scientific Model
0.1 x 10^-12 meters -️️How much is a picometer?
Microscopes that...
MSU CEM 141 Exam-Question with Correct Answers/ Verified
Claim, always include an explanation and reasoning to the claim. - ✔️✔️The statement "If I add cold
milk to hot coffee the temperature will decrease," is a?
Models are used to make testable predictions - ✔️✔️Scientific Model
0.1 x 10^-12 meters - ✔️✔️How much is a picometer?
Microscopes that now allows us to view atoms. - ✔️✔️Atomic Force Microscopy/ Scanning
Tunneling Microscopy
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. - ✔️✔️Leaves are green
in the summer because?
91 - ✔️✔️How many naturally occurring elements exist?
- 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 Dalton's Atomic theory? (1808)
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 J.J. Thomson's experiment, and 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 was Ernest Rutherford's experiment, what did he
discover?
A law describes - tells you what happens
A theory explains - tells you why it happens - ✔️✔️What is the difference between Law and
Theory?
About 0.1 nanometer (0.1 x 10-9m) - ✔️✔️How big is an atom (H)?
- ✔️✔️Which is biggest? Atom, Molecule, Cell, or it depends?
The Greeks - ✔️✔️Where did the idea of atoms come from?
The smallest unit of an element - ✔️✔️Atoms
The particles are identical regardless of the identity of the cathode(where they were emitted from). -
✔️✔️What is the evidence from Thomson's experiment that all atoms contain electrons?
Has 2 protons and 2 neutrons. It is the nucleus of a Helium atom. - ✔️✔️What is an alpha particle?
Negative and positive charges attract and like charges repel. - ✔️✔️Coulomb's Law
False - ✔️✔️Do gravitational forces increase as distance between the objects increase?
True - ✔️✔️Do gravitational forces increase as the mass of the object increases?
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