CHEM 101 - EXAM -1 STUDY GUIDE (CH. 1-3) QUESTIONS WITH CORRECT ANSWERS

CHEM 101 - EXAM #1 STUDY GUIDE
(CH. 1-3) QUESTIONS WITH
CORRECT ANSWERS
chemistry - CORRECT ANSWER -the study of matter and the changes it undergoes



scientific method - CORRECT ANSWER -a systematic approach to research



qualitative data - CORRECT ANSWER -general observations



quantitative data - CORRECT ANSWER -comprising of numbers obtained by measurement



hypothesis - CORRECT ANSWER -a tentative explanation for a set of observations



law - CORRECT ANSWER -a mathematical relationship thatBis consistently found to be true



theory - CORRECT ANSWER -
a general principle or body of principles that has been developed to explain a wide variety of ph
enomena (this is NOT a wild guess)



two major goals of science - CORRECT ANSWER -prediction and control



two "better" goals of science - CORRECT ANSWER -understanding and explanation



four basic rules of good science - CORRECT ANSWER -1. results should be reproducible by others

2. detailed research results should be reviewable

,3. conclusions should be reasonable and unbiased

4. "give credit when credit is due"



physics - CORRECT ANSWER -chemistry in motion



biology - CORRECT ANSWER -chemistry in a cell



engineering - CORRECT ANSWER -chemistry in application



matter - CORRECT ANSWER -anything that occupies volume and has mass



matter is governed by... - CORRECT ANSWER -composition and energy



mixture - CORRECT ANSWER -
a combination of two or more substances in which the substances retain their distinct identities



homogeneous mixture - CORRECT ANSWER -composition of the mixture is the same throughout



heterogeneous mixture - CORRECT ANSWER -
composition of the mixture is not uniform throughout



mixture separation - CORRECT ANSWER -
physical means can be used to separate a mixture into its pure components



element - CORRECT ANSWER -
a substance that cannot be separated into simpler substances by chemical means

, number of elements defined - CORRECT ANSWER -114
X2 X2 X2 X2 X2 X2 X2




number of elements that naturally occur on earth - CORRECT ANSWER -82
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




number of elements been created by scientists - CORRECT ANSWER -32
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




compound - CORRECT ANSWER - X2 X2 X2 X2




a substance composed of atoms of two or more elements chemically united in fixed proportions
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




compound separation - CORRECT ANSWER - X2 X2 X2 X2 X2




compounds can only be separated into their pure components (elements) by chemical means
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




physical property - CORRECT ANSWER -
X2 X2 X2 X2 X2




properties that can be observed and measured without changing the composition of the substa nc
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




e (color, density, conductivity, etc.)
X2 X2 X2 X2




chemical property - CORRECT ANSWER -
X2 X2 X2 X2 X2




properties that are only observable during a chemical change (combustibility, food digestion...)
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




extensive property - CORRECT ANSWER -
X2 X2 X2 X2 X2




a property that depends upon how much matter is being considered (mass, length, volume)
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




intensive property - CORRECT ANSWER -
X2 X2 X2 X2 X2




a property that does not depend upon how much matter is being considered (density, temperat ure
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




, color)
X2




physical change - CORRECT ANSWER -
X2 X2 X2 X2 X2




does not alter the composition or identity of a substance (ice melting, sugar dissolving in water)
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2