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AP Chemistry Unit 1 Exam with complete solutions 2024_2025
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AP Chemistry Unit 1 Exam with complete solutions 2024_2025
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AP Chemistry Unit 1 Exam with completesolutions 2024/2025
Chemistry - ANSWER-The scientific discipline that treats the composition,
properties, and transformations of matter.
Matter - ANSWER-Anything that occupies space and has mass; the physical
material of the universe.
Property - ANSWER-A characteristic that gives a sample of matter its unique
identity.
Element - ANSWER-A substance that cannot be separated into simpler
substances by chemical means.
Atom - ANSWER-The smallest representative particle of an element.
Molecule - ANSWER-A chemical combination of two or more atoms.
States of Matter - ANSWER-The three forms that matter can assume: solid, liquid,
and gas.
Gas - ANSWER-Matter that has no fixed volume or shape; it conforms to the
volume and shape of its container.
Liquid - ANSWER-Matter that has a distinct volume but no specific shape.
Solid - ANSWER-Matter that has both a definite shape and a definite volume.
Pure Substance - ANSWER-Matter that has a fixed composition and distinct
properties.
, Compound - ANSWER-A substance compose of two or more elements united
chemically in definite proportions.
Mixture - ANSWER-A combination of two or more substances in which each
substance retains its own chemical identity.
Law of Constant Composition - ANSWER-A law that states that the elemental
composition of a pure compound is always the same, regardless of its source;
also called the law of definite proportions.
Heterogeneous Mixture - ANSWER-A mixture which does not have the same
composition, properties, and appearance throughout.
Homogeneous Mixture - ANSWER-A mixture which has uniform composition,
properties, and appearance throughout.
Solution - ANSWER-A mixture of substances that has a uniform composition; a
homogeneous mixture.
Physical Properties - ANSWER-Properties that can be measured without
changing the composition of a substance, for example, color and freezing point.
Chemical Properties - ANSWER-Properties that describe a substance's
composition and its reactivity; how the substance reacts and changes into other
substances.
Intensive Property - ANSWER-A property that is independent of the amount of
material considered, for example, density.
Extensive Property - ANSWER-A property that depends on the amount of material
considered; for example, mass or volume.
Physical Change - ANSWER-Changes, such as phase change, that occur with no
change in chemical composition.
Changes of State - ANSWER-Transformations of matter from one state to a
different one, for example, from a gas to a liquid.
Chemical Reaction - ANSWER-Processes in which one or more substances are
converted into other substances; also called chemical changes.
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