CHEM 101 - EXAM #1 STUDY
GUIDE (CH. 1-3) WITH 100%
CORRECT ANSWERS GRADED A+
2026 UPDATE!!
chemistry - answer-the study of matter and the changes it undergoes
scientific method - answer-a systematic approach to research
qualitative data - answer-general observations
quantitative data - answer-comprising of numbers obtained by measurement
hypothesis - answer-a tentative explanation for a set of observations
law - answer-a mathematical relationship that is consistently found to be true
theory - answer-a general principle or body of principles that has been developed to
explain a wide variety of phenomena (this is NOT a wild guess)
two major goals of science - answer-prediction and control
two "better" goals of science - answer-understanding and explanation
four basic rules of good science - 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 - answer-chemistry in motion
biology - answer-chemistry in a cell
engineering - answer-chemistry in application
matter - answer-anything that occupies volume and has mass
matter is governed by... - answer-composition and energy
mixture - answer-a combination of two or more substances in which the substances
retain their distinct identities
homogeneous mixture - answer-composition of the mixture is the same throughout
heterogeneous mixture - answer-composition of the mixture is not uniform throughout
mixture separation - answer-physical means can be used to separate a mixture into its
pure components
element - answer-a substance that cannot be separated into simpler substances by
chemical means
number of elements defined - answer-114
number of elements that naturally occur on earth - answer-82
number of elements been created by scientists - answer-32
, compound - answer-a substance composed of atoms of two or more elements
chemically united in fixed proportions
compound separation - answer-compounds can only be separated into their pure
components (elements) by chemical means
physical property - answer-properties that can be observed and measured without
changing the composition of the substance (color, density, conductivity, etc.)
chemical property - answer-properties that are only observable during a chemical
change (combustibility, food digestion...)
extensive property - answer-a property that depends upon how much matter is being
considered (mass, length, volume)
intensive property - answer-a property that does not depend upon how much matter is
being considered (density, temperature, color)
physical change - answer-does not alter the composition or identity of a substance (ice
melting, sugar dissolving in water)
chemical change - answer-alters the composition or identity of the substance(s)
involved (hydrogen burns in air to form water)
energy - answer-the capacity to do work
radiant energy - answer-energy that comes from the sun and is earth's primary energy
source
GUIDE (CH. 1-3) WITH 100%
CORRECT ANSWERS GRADED A+
2026 UPDATE!!
chemistry - answer-the study of matter and the changes it undergoes
scientific method - answer-a systematic approach to research
qualitative data - answer-general observations
quantitative data - answer-comprising of numbers obtained by measurement
hypothesis - answer-a tentative explanation for a set of observations
law - answer-a mathematical relationship that is consistently found to be true
theory - answer-a general principle or body of principles that has been developed to
explain a wide variety of phenomena (this is NOT a wild guess)
two major goals of science - answer-prediction and control
two "better" goals of science - answer-understanding and explanation
four basic rules of good science - 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 - answer-chemistry in motion
biology - answer-chemistry in a cell
engineering - answer-chemistry in application
matter - answer-anything that occupies volume and has mass
matter is governed by... - answer-composition and energy
mixture - answer-a combination of two or more substances in which the substances
retain their distinct identities
homogeneous mixture - answer-composition of the mixture is the same throughout
heterogeneous mixture - answer-composition of the mixture is not uniform throughout
mixture separation - answer-physical means can be used to separate a mixture into its
pure components
element - answer-a substance that cannot be separated into simpler substances by
chemical means
number of elements defined - answer-114
number of elements that naturally occur on earth - answer-82
number of elements been created by scientists - answer-32
, compound - answer-a substance composed of atoms of two or more elements
chemically united in fixed proportions
compound separation - answer-compounds can only be separated into their pure
components (elements) by chemical means
physical property - answer-properties that can be observed and measured without
changing the composition of the substance (color, density, conductivity, etc.)
chemical property - answer-properties that are only observable during a chemical
change (combustibility, food digestion...)
extensive property - answer-a property that depends upon how much matter is being
considered (mass, length, volume)
intensive property - answer-a property that does not depend upon how much matter is
being considered (density, temperature, color)
physical change - answer-does not alter the composition or identity of a substance (ice
melting, sugar dissolving in water)
chemical change - answer-alters the composition or identity of the substance(s)
involved (hydrogen burns in air to form water)
energy - answer-the capacity to do work
radiant energy - answer-energy that comes from the sun and is earth's primary energy
source
