Chem 103 Exam 3
2023,2024,2025,2026 Practice
Exam Material Scored A+
Molecular Compound - <<<<ANSWERS>>>(also, covalent compound)
composed of molecules formed by atoms of two or more different elements
Classify metals - <<<<ANSWERS>>>(elements that are shiny, malleable,
good conductors of heat and electricity—shaded yellow);
Classify nonmetal - <<<<ANSWERS>>>nonmetals (elements that appear
dull, poor conductors of heat and electricity—shaded green);
Classify metalloids - <<<<ANSWERS>>>metalloids (elements that conduct
heat and electricity moderately well, and possess some properties of
metals and some properties of nonmetals—shaded purple).
Define Pure substance - <<<<ANSWERS>>>A pure substance has a
constant composition. All specimens of a pure substance have exactly the
same makeup and
Define Chemistry - <<<<ANSWERS>>>the study of the composition,
properties, and interactions of matter.
Define Matter - <<<<ANSWERS>>>Anything that has mass and occupies
space
Define Daltons atomic theory - <<<<ANSWERS>>>set of postulates that
established the fundamental properties of atoms
1.Matter is composed of exceedingly small particles called atoms. An atom
is the smallest unit of an element that can participate in a chemical change.
2.An element consists of only one type of atom, which has a mass that is
characteristic of the element and is the same for all atoms of that element
, (Figure). A macroscopic sample of an element contains an incredibly large
number of atoms, all of which have identical chemical properties.
3. Atoms of one element differ in properties from atoms of all other
elements.
4. A compound consists of atoms of two or more elements combined in a
small, whole-number ratio. In a given compound, the numbers of atoms of
each of its elements are always present in the same ratio
5.Atoms are neither created nor destroyed during a chemical change, but
are instead rearranged to yield substances that are different from those
present before the change
define subatomic particle - <<<<ANSWERS>>>a particle smaller than an
atom (e.g., a neutron) or a cluster of such particles
Define Scientific method - <<<<ANSWERS>>>path of discovery that leads
from question and observation to law or hypothesis to theory, combined
with experimental verification of the hypothesis and any necessary
modification of the theory
physical change - <<<<ANSWERS>>>does not affect the chemical
makeup of a substance
Classify matter as an element - <<<<ANSWERS>>>Pure substances that
cannot be broken down into simpler substances by chemical changes are
called elements.
Classify matter as an compound - <<<<ANSWERS>>>Pure substances
that can be broken down by chemical changes are called compounds.
Classify matter as an homogenous mixture - <<<<ANSWERS>>>A
homogeneous mixture, also called a solution, exhibits a uniform
composition and appears visually the same throughout. (Gatorade)
Classify matter as an heterogenous mixture - <<<<ANSWERS>>>A
mixture with a composition that varies from point to point is called a
heterogeneous mixture. for example: Oil and vinegar salad dressing is a
heterogeneous mixture because its composition is not uniform throughout.
2023,2024,2025,2026 Practice
Exam Material Scored A+
Molecular Compound - <<<<ANSWERS>>>(also, covalent compound)
composed of molecules formed by atoms of two or more different elements
Classify metals - <<<<ANSWERS>>>(elements that are shiny, malleable,
good conductors of heat and electricity—shaded yellow);
Classify nonmetal - <<<<ANSWERS>>>nonmetals (elements that appear
dull, poor conductors of heat and electricity—shaded green);
Classify metalloids - <<<<ANSWERS>>>metalloids (elements that conduct
heat and electricity moderately well, and possess some properties of
metals and some properties of nonmetals—shaded purple).
Define Pure substance - <<<<ANSWERS>>>A pure substance has a
constant composition. All specimens of a pure substance have exactly the
same makeup and
Define Chemistry - <<<<ANSWERS>>>the study of the composition,
properties, and interactions of matter.
Define Matter - <<<<ANSWERS>>>Anything that has mass and occupies
space
Define Daltons atomic theory - <<<<ANSWERS>>>set of postulates that
established the fundamental properties of atoms
1.Matter is composed of exceedingly small particles called atoms. An atom
is the smallest unit of an element that can participate in a chemical change.
2.An element consists of only one type of atom, which has a mass that is
characteristic of the element and is the same for all atoms of that element
, (Figure). A macroscopic sample of an element contains an incredibly large
number of atoms, all of which have identical chemical properties.
3. Atoms of one element differ in properties from atoms of all other
elements.
4. A compound consists of atoms of two or more elements combined in a
small, whole-number ratio. In a given compound, the numbers of atoms of
each of its elements are always present in the same ratio
5.Atoms are neither created nor destroyed during a chemical change, but
are instead rearranged to yield substances that are different from those
present before the change
define subatomic particle - <<<<ANSWERS>>>a particle smaller than an
atom (e.g., a neutron) or a cluster of such particles
Define Scientific method - <<<<ANSWERS>>>path of discovery that leads
from question and observation to law or hypothesis to theory, combined
with experimental verification of the hypothesis and any necessary
modification of the theory
physical change - <<<<ANSWERS>>>does not affect the chemical
makeup of a substance
Classify matter as an element - <<<<ANSWERS>>>Pure substances that
cannot be broken down into simpler substances by chemical changes are
called elements.
Classify matter as an compound - <<<<ANSWERS>>>Pure substances
that can be broken down by chemical changes are called compounds.
Classify matter as an homogenous mixture - <<<<ANSWERS>>>A
homogeneous mixture, also called a solution, exhibits a uniform
composition and appears visually the same throughout. (Gatorade)
Classify matter as an heterogenous mixture - <<<<ANSWERS>>>A
mixture with a composition that varies from point to point is called a
heterogeneous mixture. for example: Oil and vinegar salad dressing is a
heterogeneous mixture because its composition is not uniform throughout.
