UNE CHEM 1010 LAB FINAL EXAM
AND ALL CORRECT ANSWERS.
density - Answer mass/volume
Heterogenous mixture - Answer composition is not uniform throughout (ex. mixed nuts)
homogeneous mixture - Answer A mixture in which substances are evenly distributed
throughout the mixture (ex. chocolate milk)
Solvent - Answer the substance in which the solute dissolves
Solute - Answer A substance that is dissolved in a solution.
missible - Answer liquids that dissolve freely in one another in any proportion (soluble)
imiscible - Answer liquids are not soluble in one another
physical change - Answer A change in a substance that does not involve a change in the
identity of the substance; a change in the form or state of a substance (ex. freezing or boiling of
H2O)
Decomposition reaction - Answer a reaction in which a single compound breaks down to
form two or more simpler substances
(AB --> A + B)
Combination Reaction - Answer a chemical change in which two or more substances react to
form a single new substance
(A + B --> AB)
Single displacement - Answer one element trades places with another element in a
compound: A + BC --> AC + B
double displacement reaction - Answer a reaction in which a gas, a solid precipitate, or a
molecular compound forms from the apparent exchange of atoms or ions between two
compounds
(AB + CD --> AD + CB)
, limiting reagent: - Answer the reactant that is consumed first
excess reagent - Answer the reactant that is not completely used up in a reaction
Hydrates - Answer compounds that have a specific number of water molecules attached to
them
-water molecules ina hyddrate are easily removed by heating the solid hydrate / dissolving in
the water
Exothermic reaction - Answer Heat is released to the surroundings; temperature increases
endothermic reaction - Answer heat is absorbed from surroundings; temperature decreases
Energy of a photon - Answer E=hf
*h= planck's constant
compound - Answer a pure substance composed of two or more elements that are
chemically combined together in specific proportions
the simplest chemical substance can be composed of? - Answer one type of atom
how can compounds be separated into their parts - Answer breaking apart the chemical
bonds
solubility - Answer describes the capacity of a given chemical substance to fully dissolve with
another, and is dependent upon pressure (for gases) and temperature (for gases and solids)
-maximum amount of solute that is able to be dissolved in a specific amount of solvent at a
specific temperature; thus it is defined in terms of concentration and is independent of rate.
dissolution - Answer dissolution is a kinetic process defined by rate (how fast something
happens), and not specific to concentration.
nature of solutes and solvents - Answer determined by both the chemical structure and
properties of the pure substance. Solutes and solvents can be roughly divided into two groups,
polar and nonpolar
-For most solids dissolved in liquids (especially H2O), solubility increases as temperature
increases.
AND ALL CORRECT ANSWERS.
density - Answer mass/volume
Heterogenous mixture - Answer composition is not uniform throughout (ex. mixed nuts)
homogeneous mixture - Answer A mixture in which substances are evenly distributed
throughout the mixture (ex. chocolate milk)
Solvent - Answer the substance in which the solute dissolves
Solute - Answer A substance that is dissolved in a solution.
missible - Answer liquids that dissolve freely in one another in any proportion (soluble)
imiscible - Answer liquids are not soluble in one another
physical change - Answer A change in a substance that does not involve a change in the
identity of the substance; a change in the form or state of a substance (ex. freezing or boiling of
H2O)
Decomposition reaction - Answer a reaction in which a single compound breaks down to
form two or more simpler substances
(AB --> A + B)
Combination Reaction - Answer a chemical change in which two or more substances react to
form a single new substance
(A + B --> AB)
Single displacement - Answer one element trades places with another element in a
compound: A + BC --> AC + B
double displacement reaction - Answer a reaction in which a gas, a solid precipitate, or a
molecular compound forms from the apparent exchange of atoms or ions between two
compounds
(AB + CD --> AD + CB)
, limiting reagent: - Answer the reactant that is consumed first
excess reagent - Answer the reactant that is not completely used up in a reaction
Hydrates - Answer compounds that have a specific number of water molecules attached to
them
-water molecules ina hyddrate are easily removed by heating the solid hydrate / dissolving in
the water
Exothermic reaction - Answer Heat is released to the surroundings; temperature increases
endothermic reaction - Answer heat is absorbed from surroundings; temperature decreases
Energy of a photon - Answer E=hf
*h= planck's constant
compound - Answer a pure substance composed of two or more elements that are
chemically combined together in specific proportions
the simplest chemical substance can be composed of? - Answer one type of atom
how can compounds be separated into their parts - Answer breaking apart the chemical
bonds
solubility - Answer describes the capacity of a given chemical substance to fully dissolve with
another, and is dependent upon pressure (for gases) and temperature (for gases and solids)
-maximum amount of solute that is able to be dissolved in a specific amount of solvent at a
specific temperature; thus it is defined in terms of concentration and is independent of rate.
dissolution - Answer dissolution is a kinetic process defined by rate (how fast something
happens), and not specific to concentration.
nature of solutes and solvents - Answer determined by both the chemical structure and
properties of the pure substance. Solutes and solvents can be roughly divided into two groups,
polar and nonpolar
-For most solids dissolved in liquids (especially H2O), solubility increases as temperature
increases.
