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Chemistry 103 Exam 1 Study Guide Questions with complete solutions 2024_2025
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Chemistry 103 Exam 1 Study Guide Questions with complete solutions 2024_2025
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Chemistry 103 Exam 1 Study GuideQuestions with complete solutions
2024/2025
The Law of Definite Proportions states that in a given chemical compound, the
elements are always combined in the same proportions by _______________ -
ANSWER-mass
The Law of Conservation of mass states that no detectable gain or loss of mass
occurs in chemical reactions. Mass is _______________. - ANSWER-conserved
Dalton's atomic theory states that matter consists of tiny particles called
_____________ - ANSWER-atoms
Dalton's theory also states that atoms are ____________: in chemical reactions,
atoms can rearrange but they do not themselves break apart. - ANSWER-
indestructable
Dalton's theory also states that in a given compound the constituent atoms are
always present in the same fixed numerical ____________ - ANSWER-ratio
Electrons are ___________ charged, protons are ______________ charged, and
neutrons are _________________. - ANSWER-negatively, positively, neutral
Electrons are much _______________ than protons and neutrons - ANSWER-
smaller
, Protons and neutrons are found within the _____________ of an atom - ANSWER-
nucleus
In a neutral atom, the number of ____________ and _______________ must be
equal. - ANSWER-protons, electrons
The atomic number f an atom = its number of _______________ - ANSWER-
protons
the mass number of an atom = ___________+____________ - ANSWER-protons,
neutrons
Isotopes vary only in the number of ___________________ - ANSWER-neutrons
___________ is defined as anything that occupies space and has mass -
ANSWER-matter
_______ refers to how much matter there is in a given object, whereas
___________ refers to the force with which the object is attracted by gravity -
ANSWER-mass, weight
____________ ____________ are transformations that alter the chemical
compositions of substances - ANSWER-chemical reactions
Substances that cannot be decomposed into simpler materials by chemical
reactions are called ____________ - ANSWER-elements
Elements and compounds are examples of ________ ___________, the
composition of which is always the same, regardless of its source. - ANSWER-
pure substances
_____________ can have variable compositions - ANSWER-Mixtures
A ________________ mixture has the same properties throughout the sample and
is called a ________________ - ANSWER-homogeneous; solution
A ___________________ mixture consists of two or more regions, called
_____________ that differ in properties - ANSWER-heterogeneous; phases
Formation or separation of a mixture into its components can be accomplished
by a _____________ change, which formation or decomposition of a compound
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