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