CHM 151 Exam 2 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Biomass - CORRECT ANSWER A measure of the total dry mass of organisms and
plants within a particular region
biofuel - CORRECT ANSWER Liquid fuel created from processed or refined biomass
concentrated vs dilute solutions - CORRECT ANSWER Concentrated - Solutions are
concentrated if many solute particles are present
Dilute - Solutions are dilute if few solute particles are present
electrolyte (strong vs weak) - CORRECT ANSWER Electrolytes are soluble
compounds that conduct electricity when dissolved in water
• Weak - electrolytes dissociate partially into ions in solution
• Strong - electrolytes dissociate completely into ions in solution
nonelectrolytes - CORRECT ANSWER Nonelectrolytes are substances whose
solutions do not conduct electricity
saturated solution vs unsaturated solution - CORRECT ANSWER Saturated solution -
holds the maximum amount of dissolved solute at a given temperature, where no more can
dissolve and equilibrium exists between
dissolved/undissolved solute.
Unsaturated solution - holds less than the maximum capacity, allowing more solute to
dissolve
, soluble vs insoluble - CORRECT ANSWER Soluble - compounds dissolve readily in
water
Insoluble - compounds do not dissolve readily in water
precipitate - CORRECT ANSWER A solid that forms from a solution during a
chemical reaction.
precipitation reaction - CORRECT ANSWER A precipitation reaction is an aqueous
reaction that produces a solid, called the precipitate.
reaction stoichiometry - CORRECT ANSWER involves the mass relationships
between reactants and products in a chemical reaction
Have No Fear Of Ice Cold Beer (balancing equations) - CORRECT ANSWER H2, N2,
F2, O2, I2, Cl2, Br2
How to predict solubility using a table? - CORRECT ANSWER 1. Identify the cation
and anion in the compound
2. Check if either ion belongs to "usually soluble" group
3. Check exceptions, if none compound is soluble, if there are exceptions check to see if your
compound or one of your ions is one of them.
Acids - CORRECT ANSWER Acids are substances that dissolve in water to produce
H+ or H3O+ ions
• Examples: HCl, HNO3, H3PO4, HCN
Bases - CORRECT ANSWER Bases are substances that dissolve in water to produce-
OH- ions
QUESTIONS AND CORRECT ANSWERS
Biomass - CORRECT ANSWER A measure of the total dry mass of organisms and
plants within a particular region
biofuel - CORRECT ANSWER Liquid fuel created from processed or refined biomass
concentrated vs dilute solutions - CORRECT ANSWER Concentrated - Solutions are
concentrated if many solute particles are present
Dilute - Solutions are dilute if few solute particles are present
electrolyte (strong vs weak) - CORRECT ANSWER Electrolytes are soluble
compounds that conduct electricity when dissolved in water
• Weak - electrolytes dissociate partially into ions in solution
• Strong - electrolytes dissociate completely into ions in solution
nonelectrolytes - CORRECT ANSWER Nonelectrolytes are substances whose
solutions do not conduct electricity
saturated solution vs unsaturated solution - CORRECT ANSWER Saturated solution -
holds the maximum amount of dissolved solute at a given temperature, where no more can
dissolve and equilibrium exists between
dissolved/undissolved solute.
Unsaturated solution - holds less than the maximum capacity, allowing more solute to
dissolve
, soluble vs insoluble - CORRECT ANSWER Soluble - compounds dissolve readily in
water
Insoluble - compounds do not dissolve readily in water
precipitate - CORRECT ANSWER A solid that forms from a solution during a
chemical reaction.
precipitation reaction - CORRECT ANSWER A precipitation reaction is an aqueous
reaction that produces a solid, called the precipitate.
reaction stoichiometry - CORRECT ANSWER involves the mass relationships
between reactants and products in a chemical reaction
Have No Fear Of Ice Cold Beer (balancing equations) - CORRECT ANSWER H2, N2,
F2, O2, I2, Cl2, Br2
How to predict solubility using a table? - CORRECT ANSWER 1. Identify the cation
and anion in the compound
2. Check if either ion belongs to "usually soluble" group
3. Check exceptions, if none compound is soluble, if there are exceptions check to see if your
compound or one of your ions is one of them.
Acids - CORRECT ANSWER Acids are substances that dissolve in water to produce
H+ or H3O+ ions
• Examples: HCl, HNO3, H3PO4, HCN
Bases - CORRECT ANSWER Bases are substances that dissolve in water to produce-
OH- ions
