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CHEM 101-Straighterline Exam 1|78 Questions and Answers
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CHEM 101-Straighterline Exam 1|78Questions and Answers
A substance in which the atoms or molecules are free to move relative to
one another. It always assumes the shape and volume of its container. - -
gas
-A substance in which the atoms or molecules pack closer than a gas, but
are still able to freely move relative to one another. It exhibits a fixed
volume, but not a fixed shape. - -liquid
-A substance in which the atoms or molecules are fixed at a specific
position. It exhibits a fixed volume and rigid shape. - -solid
-A solid that has atoms and molecules in a repeatable pattern. - -crystalline
solid
-A solid whose atoms or molecules are not arranged in a specific pattern. - -
amorphous solid
-A substance does not vary its composition within the substance nor
between samples of the same substance. - -pure substance
-A physical combination of substances in which each substance keeps its
own physical and chemical properties. - -mixture
-A physical combination of substances of non-uniform composition. - -
heterogeneous mixture
-A physical combination of substances of uniform composition. - -
homogeneous mixture
-A pure substance that cannot be broken into component parts. Examples
include helium, nitrogen, and oxygen. - -element
-A pure substance made up of two or more elements. - -compound
-A quantitative observation. - -measurement
-Any division of a quantity that may be used in a measurement. - -unit
-The SI unit for length. - -meter
-The SI unit for time. - -second
, -The SI unit for mass. - -kilogram
-The standard unit of measurement used to count atoms. - -mole
-A unit system abbreviated as SI that is used by scientists. - -International
System of Units
-A unit system of measurement used throughout the world. - -metric system
-A unit system of measurement mainly used in the United States. - -english
system
-Changes the SI unit by a power of 10. - -prefix multiplier
-An English temperature unit system used mainly in the United States. - -
fahrenheit
-A combination of SI units. - -derived units
-A metric temperature unit system used throughout the world. - -celsius
-A derived unit defined as mass/volume. - -density
-A property that does not depend on the amount of a substance. - -intensive
property
-A property that depends on the amount of a substance. - -extensive
property
-A measurement that is repeatable in an experimental setup, within an
acceptable range of error. - -reliable measurements
-How close a series of measurements are to each other. - -precision
-How close a series of measurements are to the actual value. - -accuracy
-A non-place-holding digit in any numerical measurement. - -significant digit
-Rounding numerical data to the nearest power of 10 for rapid estimated
calculations. - -order-of-magnitude estimation
-The force that holds atoms together in molecules and materials. - -
chemical bond
-A bond between two or more atoms in which the electrons are shared. - -
covalent bond
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