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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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