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Midterm

CHE 102 Midterm: chem 102-exam 1 study guide


Department
Chemistry
Course Code
CHE 102
Professor
Zona
Study Guide
Midterm

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All crows are black. That bird is a crow, therefore it is black. This is an example of which
argument type.
If A, then B. B, therefore A.
The birth of natural science can be traced to important assumptions made by thinkers in
the Aegean basin 2500 years ago. What best summarizes these choices?
Natural phenomena are logically understandable.
Chemists use a very large number to designate a standard pile of atoms or molecules.
This number is called
Avogadros number
A confirming result in an experiment designed to test a hypothesis is best represented
by which logical form?
If A, then B. B, therefore A.
The conversion of water to hydrogen and oxygen may best be described
how?
chemical change
Diatomics are so described because...
under normal conditions, they exist as a pair of bonded atoms of the element.
Ethanol is a pure substance that may be chemically decomposed into carbon, hydrogen
and oxygen. Which statement is true?
Ethanol is a compound.
The formula for the area of a circle is pi*r2. The area of a circle is linearly related to
which quantity?
r2
From what idea is the definition of the meter, the basic unit of length in the metric
system, derived?
1/10,000,000 the distance from the equator to the North Pole.
A grey metallic element is found to react rapidly with water to produce hydrogen gas
and a solid white substance. What can be said about the
white solid?
It is a compound.
How is the concept of a physical change best understood?
A physical change does not involve a change in the identity of the material.
How may the dissolution of salt in water be best described?
physical change
If A, then B. A therefore B
valid
If A, then B. B therefore A.
invalid
If A, then B. B, therefore A.
If A, then B. Not A, therefore not B.
both invalid
If A, then B. Not A, therefore not B.
invalid
If A, then B. Not B, therefore not A.
valid
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