Honors Chemistry Semester 2 Final Exam
Questions And Answers 100% Pass.
Which of the following best defines the molar mass of a substance?
Mass, in grams, of each particle of the substance
Total mass, in grams, of 100 particles of the substance
Mass, in grams, of the nucleus of the substance's...
Honors Chemistry Semester 2 Final Exam
Questions And Answers 100% Pass.
Which of the following best defines the molar mass of a substance?
Mass, in grams, of each particle of the substance
Total mass, in grams, of 100 particles of the substance
Mass, in grams, of the nucleus of the substance's atoms
Total mass, in grams, of all the particles in one mole of the substance - answer✔Total mass, in
grams, of all the particles in one mole of the substance
What is the mass of 0.50 moles of Na? - answer✔11 grams
Which formula can be used to calculate the molar mass of ammonia (NH3)?
molar mass of N + molar mass of H
3 × molar mass of N + molar mass of H
molar mass of N + 3 × molar mass of H
3 × molar mass of N + 3 × molar mass of H - answer✔molar mass of N + 3 × molar mass of H
What is the molar mass of magnesium carbonate, MgCO3? - answer✔84.313 g/mol
What is the empirical formula for C4H12O2? - answer✔C2H6O
What is the percentage composition of hydrogen in the compound C2H4? - answer✔14.37%
Read the chemical equation.
Mg + 2HCl → MgCl2 + H2
How many moles of MgCl2 are produced from 4 moles of HCl? - answer✔2.0
The table shows a chemical equation and the dimensional analysis used by a student to calculate
the number of moles of Ba3N2 required to produce 6.7 moles of Ba(OH)2.
Student's Dimensional Analysis
Chemical Equation: Ba3N2 + 6H2O → 3Ba(OH)2 + 2NH3
Dimensional Analysis: 3 mol of Ba(OH)2 x 1 mol of Ba3N.7 mol of Ba(OH)2
What is the error in the dimensional analysis? - answer✔3 mol of Ba(OH)2 and 6.7 mol of
Ba(OH)2 should be interchanged
The following reaction shows sodium hydroxide reacting with sulfuric acid.
NaOH + H2SO4 → Na2SO4 + H2O
How many grams of Na2SO4 are produced from 10.0 grams of NaOH?
(Molar mass of Na = 22.989 g/mol, O = 15.999 g/mol, H = 1.008 g/mol, S = 32.065 g/mol) -
answer✔17.8 grams
A synthesis reaction is shown in which A and B represent two reactants forming a compound C.
A+B→C
Which of the following values is used in the stoichiometric calculations to determine the limiting
reactant for the reaction?
Mole ratio of A to B
Mole ratio of C to B
Starting amount of C in grams
Starting amount of C in moles - answer✔Mole ratio of C to B
A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to
form methanol (CH3OH). How many grams of methanol are produced when 7.0 grams of carbon
monoxide reacts with 2.5 grams of hydrogen gas? - answer✔8.0 grams
A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.25
grams of aluminum foil in a solution of 0.40 grams of copper (II) chloride. A single replacement
reaction takes place. What are the likely observations when the reaction stops? - answer✔About
0.20 grams of copper (II) is formed, and some aluminum is left in the reaction mixture
Which of the following is true for the actual yield of a reaction?
It is always calculated as a ratio.
It is the yield from the excess reactant.
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