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CEM 141 Final Exam Study Guide (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update CA$11.46   Add to cart
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CEM 141 Final Exam Study Guide (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update

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CEM 141 Final Exam Study Guide (1) Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
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  • 2024/2025
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CEM 141 Final Exam Study Guide
heat from a fire. - ANS-Which of the Following is not an example of Matter?

Grow the tree in a pot and measure the mass of the soil before and after the tree grows a
certain height. - ANS-In answer to the question, "When a plant grows, where does the material
come from?" the ancient Greek philosopher Aristotle hypothesized by logic that all material
came from the soil. Which of the following experimental tests might best support Aristotle's
hypothesis or show it to be incorrect?

It can be used to make predictions that can be tested with experiments, it can change as new
evidence becomes available, it explains why a phenomena happens. - ANS-What is true about
scientific theory?

It disproved the postulate "elements are composed of small indivisible, indestructible particles
called atoms" because electrons show atoms have smaller parts. - ANS-Thomson's discovery of
the electron affected Dalton's atomic theory in what way?

False, Atoms of an element may have a different number of neutrons and therefore have
different masses and properties. - ANS-"All atoms of an element are identical and have the
same mass and properties." Is that true or false and why?

Protons and neutrons are found in the nucleus. - ANS-Which of the following statements about
the composition of an atom could not be inferred based on Rutherford's gold foil experiment?

There is no mention of a field, and a single object cannot have potential energy. - ANS-What is
wrong with the statement: "As your clicker falls to the floor, the potential energy of your clicker
decreases."

Energy is just released. - ANS-What will happen to the energy in the system when this reaction
occurs: 2 H (g) --> H2 (g)?

They will collide with the sides of the pot, and the atoms in the pot are directly heated from the
stove burner. - ANS-Water in a pot on a stove burner will warn up and eventually boil. How do
the water molecules know that the temperature is increasing?

Claim: I2 has stronger attractive forces between molecules than Br2
Reasoning: I2 has a larger electron cloud and stronger LDFs than Br2 which require more
energy to overcome when it melts. - ANS-Using the following evidence, what claim and
reasoning can you make?
Evidence: The melting point of I2 is 114 C and the melting point of Br2 is -7.2 C.

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