Chem 1045 Exam 2 Questions And All
Correct Verified Answers.
hydrates - Answer have stoichiometric amount of water inside the crystal structure of the salt
(formula of ionic compund dot xH2O)
mass percent of an element in a compound - Answer mass%= g element/g compound x100
empirical formula - Answer simplest formula, smallest whole number ratio
empirical formula steps - Answer step 1 determine the mass of the elements, find the mol,
find the mol ratio (divide by the smallest mol), determine the formula
rounding rules for mol ratio - Answer 1. mol ratio is greater than or equal to X.9, round up
2. mol ratio is less than or equal X.1, round down
3. X.9 > mol ratio > X.1, cannot round, multiply by an integer to get a number that can be
rounded using steps 1 and 2
molecular formula - Answer not the simplest, actual number of atoms present
molecular formula steps - Answer nxEF where n= MF weight/ EF weight in g or amu
balancing equations - Answer coefficients must be always be a whole number & lowest ratio
(trial & error process), do not alter subscripts in a formula!
reaction stoichiometry - Answer count with a balanced equation
gA -MM-> molA -> molB-MM->gB
%yield - Answer efficiency of a rwn(reaction)
actual yield(stated in question)/theoretical yield(solve gA->molA->molB->gB)
mass% - Answer g solute/g soln x100
, g soln -density-> L soln
dilution - Answer M1V1=M2V2
concentrated dilute
M-> concentration (use molarity M or mass %)
V-> volume (L or mL)
oxidation number of an element by themselves - Answer 0
NaBr - Answer ionic salt
calcium bromide
Ca(BrO)2 - Answer ionic salt
Acids - Answer molecular species with ionic behavior when dissolved in water, generally
formulas starting with Hydrogen (H). Ex: HCl, H2O2
naming acids - Answer all binary acid have acid in the end
hydro______ic acid
solution - Answer solute + solvent
nomenclature - Answer the devising or choosing of names for things, especially in a science or
other discipline
Ox No. -4 - Answer IVA non-metals in binary ionic compounds
Ox No. -3 - Answer VA non-metals in binary ionic compounds
Ox No. -2 - Answer VIA non-metals in binary ionic compounds
O [except: peroxides -> -1 (e.g. (O2)^-2) or superoxides -> -1/2]
Correct Verified Answers.
hydrates - Answer have stoichiometric amount of water inside the crystal structure of the salt
(formula of ionic compund dot xH2O)
mass percent of an element in a compound - Answer mass%= g element/g compound x100
empirical formula - Answer simplest formula, smallest whole number ratio
empirical formula steps - Answer step 1 determine the mass of the elements, find the mol,
find the mol ratio (divide by the smallest mol), determine the formula
rounding rules for mol ratio - Answer 1. mol ratio is greater than or equal to X.9, round up
2. mol ratio is less than or equal X.1, round down
3. X.9 > mol ratio > X.1, cannot round, multiply by an integer to get a number that can be
rounded using steps 1 and 2
molecular formula - Answer not the simplest, actual number of atoms present
molecular formula steps - Answer nxEF where n= MF weight/ EF weight in g or amu
balancing equations - Answer coefficients must be always be a whole number & lowest ratio
(trial & error process), do not alter subscripts in a formula!
reaction stoichiometry - Answer count with a balanced equation
gA -MM-> molA -> molB-MM->gB
%yield - Answer efficiency of a rwn(reaction)
actual yield(stated in question)/theoretical yield(solve gA->molA->molB->gB)
mass% - Answer g solute/g soln x100
, g soln -density-> L soln
dilution - Answer M1V1=M2V2
concentrated dilute
M-> concentration (use molarity M or mass %)
V-> volume (L or mL)
oxidation number of an element by themselves - Answer 0
NaBr - Answer ionic salt
calcium bromide
Ca(BrO)2 - Answer ionic salt
Acids - Answer molecular species with ionic behavior when dissolved in water, generally
formulas starting with Hydrogen (H). Ex: HCl, H2O2
naming acids - Answer all binary acid have acid in the end
hydro______ic acid
solution - Answer solute + solvent
nomenclature - Answer the devising or choosing of names for things, especially in a science or
other discipline
Ox No. -4 - Answer IVA non-metals in binary ionic compounds
Ox No. -3 - Answer VA non-metals in binary ionic compounds
Ox No. -2 - Answer VIA non-metals in binary ionic compounds
O [except: peroxides -> -1 (e.g. (O2)^-2) or superoxides -> -1/2]
