General Chemistry 111 Exam 1|71 Questions with Verified
Answers
Classification of Matter - CORRECT ANSWER
Elements - CORRECT ANSWER -Most basic unit of matter
-Substances composed of only one type of atom
-Cannot be broken down into smaller units by chemical means
-Things found on the periodic table
Atoms - CORRECT ANSWER Smallest chemical unit of matter or indivisible unit of
an element
e.g. H, O, Na
Molecule - CORRECT ANSWER At least two or more atoms joined together
chemically
Compounds - CORRECT ANSWER -Combination of at least two or more atoms of
different elements bonded together in a defined ratio
-Can be broken down into smaller units by chemical means
*All compounds are molecules, but not all molecules are compounds!
What are the naturally occurring diatomic molecules? - CORRECT ANSWER H, O,
N, Cl, Br, I, F
*They are also elements because it is one type of atom
States (Phases) of Matter - CORRECT ANSWER The physical states of a substance
can be interconverted to one another by the addition/removal of energy
Physical Changes - CORRECT ANSWER Do not alter the chemical composition of
the substance
Pure Substances - CORRECT ANSWER -A collection of matter that has the same
chemical composition throughout
, -Have unique physical properties
-Cannot be separated to individual species by physical techniques
Chemical Change - CORRECT ANSWER Involves a change in chemical composition
of the material
Physical Properties/Processes - CORRECT ANSWER Density, color, melting point,
boiling point, condensation, evaporation, dissolving
Chemical Properties/Processes - CORRECT ANSWER Reacting with other
compounds/molecules
Mixtures - CORRECT ANSWER Matter containing at least two or more substances
that are present in variable amounts and have NOT reacted chemically
Homogeneous Mixtures - CORRECT ANSWER -Constant composition throughout
the material
-Uniform and consist of a single phase
-Aka solutions
Heterogeneous Mixtures - CORRECT ANSWER -Composition is NOT uniform
-Can consist of more than a single phase
-Easier to separate
Decantation (Density) - CORRECT ANSWER Solid/solid or liquid/liquid that don't
mix and separate by pouring
e.g. Oil on top of pork broth
Centrifugation (Density) - CORRECT ANSWER Spin fast so things with higher
density run towards the outside and things with lower density on inside OR less
dense on top, more dense on bottom
Distillation (Boiling Point) - CORRECT ANSWER Two substances that do not have
the same boiling points and evaporate/condense liquid to separate
Filtration (State of Matter/Solubility) - CORRECT ANSWER Pour liquid over filtered
paper so large items cannot get through so smaller items get left behind
Answers
Classification of Matter - CORRECT ANSWER
Elements - CORRECT ANSWER -Most basic unit of matter
-Substances composed of only one type of atom
-Cannot be broken down into smaller units by chemical means
-Things found on the periodic table
Atoms - CORRECT ANSWER Smallest chemical unit of matter or indivisible unit of
an element
e.g. H, O, Na
Molecule - CORRECT ANSWER At least two or more atoms joined together
chemically
Compounds - CORRECT ANSWER -Combination of at least two or more atoms of
different elements bonded together in a defined ratio
-Can be broken down into smaller units by chemical means
*All compounds are molecules, but not all molecules are compounds!
What are the naturally occurring diatomic molecules? - CORRECT ANSWER H, O,
N, Cl, Br, I, F
*They are also elements because it is one type of atom
States (Phases) of Matter - CORRECT ANSWER The physical states of a substance
can be interconverted to one another by the addition/removal of energy
Physical Changes - CORRECT ANSWER Do not alter the chemical composition of
the substance
Pure Substances - CORRECT ANSWER -A collection of matter that has the same
chemical composition throughout
, -Have unique physical properties
-Cannot be separated to individual species by physical techniques
Chemical Change - CORRECT ANSWER Involves a change in chemical composition
of the material
Physical Properties/Processes - CORRECT ANSWER Density, color, melting point,
boiling point, condensation, evaporation, dissolving
Chemical Properties/Processes - CORRECT ANSWER Reacting with other
compounds/molecules
Mixtures - CORRECT ANSWER Matter containing at least two or more substances
that are present in variable amounts and have NOT reacted chemically
Homogeneous Mixtures - CORRECT ANSWER -Constant composition throughout
the material
-Uniform and consist of a single phase
-Aka solutions
Heterogeneous Mixtures - CORRECT ANSWER -Composition is NOT uniform
-Can consist of more than a single phase
-Easier to separate
Decantation (Density) - CORRECT ANSWER Solid/solid or liquid/liquid that don't
mix and separate by pouring
e.g. Oil on top of pork broth
Centrifugation (Density) - CORRECT ANSWER Spin fast so things with higher
density run towards the outside and things with lower density on inside OR less
dense on top, more dense on bottom
Distillation (Boiling Point) - CORRECT ANSWER Two substances that do not have
the same boiling points and evaporate/condense liquid to separate
Filtration (State of Matter/Solubility) - CORRECT ANSWER Pour liquid over filtered
paper so large items cannot get through so smaller items get left behind
