General Chemistry Board Exam |Questions
with 100% verified Answers
What is the limiting reagent? - ✔️✔️the reactant that is used up first, which limits the amount of
product that can be formed
One mole of an ideal gas at STP = how many liters?
one mole of any substance = how many particles?
one mole of any substance = how many grams? - ✔️✔️22.4 L
6.022 x 10^23
the # of grams in it's molar mass
For the following equation...
Na + O2 --> Na2O
a) balance the chemical equation
b) Identify the limiting reagent if 50 g of Na and 30 g O2 are provided
c) Find the max number of moles of sodium oxide that can be produced given the masses
above, and find the mass of the excess reagent left over once the reaction has run to
completion - ✔️✔️a) 4Na + O2 --> 2Na2O
b) LR is Na
c) max amount is 1.085 moles or 67.27g, and there will be 12.64g of O2 left over
,What is the difference b/t theoretical yield and actual yield? How do you calculate percent
yield? - ✔️✔️theoretical yield is what you predict, actual is what you actually end up getting
Be(OH)2 is produced when water reacts with BeO. If one starts with 2Kg BeO in excess water,
and produces 1.1 kg Be(OH)2, what is the percent yield of this reaction? - ✔️✔️32%
What is the difference between anions and cations? - ✔️✔️anion= negative ion
Cation= positive ion
For elements that can form more than one positive ion, how is the charge indicated? - ✔️✔️by a
roman numeral in parentheses following the name of the element ( ex: Iron(II) )
What is the different between an ionic compound ending in -ous and one ending in -ic? - ✔️✔️-
ous indicates ion with lesser charge, and -ic indicates ions with greater charge
How are monoatomic ions named? - ✔️✔️with the suffix -ide
What is another name for a polyatomic ion? How are atoms that form multiple polyatomic ions
named? - ✔️✔️oxyanions; the one with less oxygens is given the suffix -ite and the one with
more is given the suffix -ate
How are polyatomic ions in an extended series named? - ✔️✔️-ite and -ate are still used,
respectively,
but the one with the lowest amount of oxygens is given the prefix hypo- and the one with the
highest is given the prefix per-
If a polyatomic ion gains a hydrogen, how does this effect its name? - ✔️✔️it either starts with
hydrogen or is given the prefix "bi-"
,What is the fancy word for "charge"? - ✔️✔️oxidation state
What is an electrolyte?
How come solid ionic compounds are poor conductors but once dissolved in water good
conductors?
What is the difference between weak and strong electrolytes? - ✔️✔️a solute that enables a
solution to carry current.
the water disrupts the crystalline lactic structure of the solid compound, solvating the ions and
allowing for the presence of free charge in the aqueous solution
Strong disassociate completely, weak disassociates incompletely
Label the following as electrolytes or non electrolytes (assume all are in an aqueous solution):
HCl
Sucrose
MgBr2
CH4 - ✔️✔️electrolyte
nonelectrolyte
electrolyte
nonelectrolyte
Identify the following as cations or anions, and then provide the formula or chemical symbol:
, Phosphate
Hypochlorite
Ammonium
Phosphide
Bicarbonate
Nitrite
Chromium (II) - ✔️✔️anion; PO4 3-
anion; ClO -
cation; NH4 +
anion; P 3-
anion; HCO3 -
anion; NO2 -
cation; Cr 2+
What determines whether or not a reaction will occur by itself without outside assistance? -
✔️✔️the change in gibbs free energy--if negative, the reaction is energetically favorable
What does the collision theory of chemical kinetics argue? What is the equation that
demonstrates this? - ✔️✔️states that the rate of a reaction is proportional to the number of
collisions per second between the reacting molecules, but also that not all collisions result in a
chemical reaction--the collisions must occur with the proper orientations and with sufficient
energy to break existing bonds and form new ones
rate= Z x f
rate= (total # of collision occurring per second) x (fraction of the collisions that are effective)
What equation represents a much more rigorous quantitative analysis of collision theory?
with 100% verified Answers
What is the limiting reagent? - ✔️✔️the reactant that is used up first, which limits the amount of
product that can be formed
One mole of an ideal gas at STP = how many liters?
one mole of any substance = how many particles?
one mole of any substance = how many grams? - ✔️✔️22.4 L
6.022 x 10^23
the # of grams in it's molar mass
For the following equation...
Na + O2 --> Na2O
a) balance the chemical equation
b) Identify the limiting reagent if 50 g of Na and 30 g O2 are provided
c) Find the max number of moles of sodium oxide that can be produced given the masses
above, and find the mass of the excess reagent left over once the reaction has run to
completion - ✔️✔️a) 4Na + O2 --> 2Na2O
b) LR is Na
c) max amount is 1.085 moles or 67.27g, and there will be 12.64g of O2 left over
,What is the difference b/t theoretical yield and actual yield? How do you calculate percent
yield? - ✔️✔️theoretical yield is what you predict, actual is what you actually end up getting
Be(OH)2 is produced when water reacts with BeO. If one starts with 2Kg BeO in excess water,
and produces 1.1 kg Be(OH)2, what is the percent yield of this reaction? - ✔️✔️32%
What is the difference between anions and cations? - ✔️✔️anion= negative ion
Cation= positive ion
For elements that can form more than one positive ion, how is the charge indicated? - ✔️✔️by a
roman numeral in parentheses following the name of the element ( ex: Iron(II) )
What is the different between an ionic compound ending in -ous and one ending in -ic? - ✔️✔️-
ous indicates ion with lesser charge, and -ic indicates ions with greater charge
How are monoatomic ions named? - ✔️✔️with the suffix -ide
What is another name for a polyatomic ion? How are atoms that form multiple polyatomic ions
named? - ✔️✔️oxyanions; the one with less oxygens is given the suffix -ite and the one with
more is given the suffix -ate
How are polyatomic ions in an extended series named? - ✔️✔️-ite and -ate are still used,
respectively,
but the one with the lowest amount of oxygens is given the prefix hypo- and the one with the
highest is given the prefix per-
If a polyatomic ion gains a hydrogen, how does this effect its name? - ✔️✔️it either starts with
hydrogen or is given the prefix "bi-"
,What is the fancy word for "charge"? - ✔️✔️oxidation state
What is an electrolyte?
How come solid ionic compounds are poor conductors but once dissolved in water good
conductors?
What is the difference between weak and strong electrolytes? - ✔️✔️a solute that enables a
solution to carry current.
the water disrupts the crystalline lactic structure of the solid compound, solvating the ions and
allowing for the presence of free charge in the aqueous solution
Strong disassociate completely, weak disassociates incompletely
Label the following as electrolytes or non electrolytes (assume all are in an aqueous solution):
HCl
Sucrose
MgBr2
CH4 - ✔️✔️electrolyte
nonelectrolyte
electrolyte
nonelectrolyte
Identify the following as cations or anions, and then provide the formula or chemical symbol:
, Phosphate
Hypochlorite
Ammonium
Phosphide
Bicarbonate
Nitrite
Chromium (II) - ✔️✔️anion; PO4 3-
anion; ClO -
cation; NH4 +
anion; P 3-
anion; HCO3 -
anion; NO2 -
cation; Cr 2+
What determines whether or not a reaction will occur by itself without outside assistance? -
✔️✔️the change in gibbs free energy--if negative, the reaction is energetically favorable
What does the collision theory of chemical kinetics argue? What is the equation that
demonstrates this? - ✔️✔️states that the rate of a reaction is proportional to the number of
collisions per second between the reacting molecules, but also that not all collisions result in a
chemical reaction--the collisions must occur with the proper orientations and with sufficient
energy to break existing bonds and form new ones
rate= Z x f
rate= (total # of collision occurring per second) x (fraction of the collisions that are effective)
What equation represents a much more rigorous quantitative analysis of collision theory?
