Assessment Questions: 22 results
Molecular_Structure : AtomFromGeometry (8 Variations)
Which atom or atoms could be the central atom, X, in the stable molecule XH3 with one lone pair of electrons?
Atomic Properties / Structure |
Periodicity / Periodic Table
Molecular_Structure : IDNonpolarMolc (10 Variations)
Which of the following molecules is nonpolar?
Covalent Bonding |
VSEPR Theory
Molecular_Structure : BondAngle (6 Variations)
Which of the following has the smallest H-X-H bond angle?
Covalent Bonding |
VSEPR Theory
Molecular_Structure : ElectronPairGeometry (20 Variations)
Which of the molecules/ions below have a linear electron-pair geometry?
Covalent Bonding |
VSEPR Theory
Molecular_Structure : Hybridization (10 Variations)
Which of the following molecules/ions have sp hybridization around the indicated atom?
Covalent Bonding |
MO Theory
Molecular_Structure : MatchOrganicAngles (10 Variations)
1-amino-2-naphthol-6-sulfonic acid is used as a photographic developer. Its structure is shown below, although lone electron pairs are not shown.

Match the designated bond angles to the appropriate values.

Covalent Bonding |
VSEPR Theory
Molecular_Structure : MolecularGeometry (23 Variations)
Which of the following molecules/ions have a linear molecular geometry like the structure shown below?

Be patient. It may take a while for the structure to load.

Covalent Bonding |
VSEPR Theory
Atoms,_Molecules_and_Ions : IonicOrMolecular (10 Variations)
Identify each of the following compounds as ionic or molecular.
Molecular Properties / Structure
Atoms,_Molecules_and_Ions : MolcFormulaTypes (8 Variations)

The structural formula for 2-methyl-butane is given below. What is the molecular formula for 2-methyl-butane?

Nomenclature / Units / Symbols
Stoichiometry : FormulaFromComp (8 Variations)
Lactic acid is the substance that makes your muscles burn when you've been exercising hard. Lactic acid is composed of 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by weight. If it has a molar mass of 90 g/mol, what is its molecular formula?
Stoichiometry |
Molecular Properties / Structure
Atoms,_Molecules_and_Ions : NameFromFormula (16 Variations)
What is the name of N2H4?
Nomenclature / Units / Symbols
Gases : IDGasFromVelocity (8 Variations)
The following are graphs of molecular velocities versus the relative number of molecules for argon, chlorine, methane and xenon at 300K. Which graph is for argon?
Gases |
Molecular Properties / Structure
Gases : KineticMolcThry (7 Variations)
Which postulate of kinetic-molecular theory best accounts for the fact that gases can be compressed easily?
Gases |
Kinetic-Molecular Theory
Reactions : WillSolnConduct (5 Variations)
One gram of each of the following compounds is mixed with 100mL of water. Which will form solutions that will conduct electricity?
Aqueous Solution Chemistry
Solutions : MixturesMolcPics (11 Variations)
Which of the following combinations of substances corresponds to the molecular scale diagram shown below?

Solutions / Solvents |
Noncovalent Interactions |
Precipitation / Solubility
Atoms,_Molecules_and_Ions : CompFromNanoPic (9 Variations)
__________ can be represented by the nanoscale diagram below.

Which of the following is the best choice to fill in the blank?

Molecular Properties / Structure
Atoms,_Molecules_and_Ions : CalcMolarMass (8 Variations)
What is the molar mass of potassium phosphate, K3PO4?

Enter the numeric value very carefully below, rounding to one decimal place only. Do not put the units in, but think about what the units are!

Molecular Properties / Structure |
Bonding : DetermineStructure (8 Variations)
H A substance is analyzed and found to contain 57.10% carbon, 4.80% hydrogen and 38.06% oxygen by weight. Its molecular weight is determined to be 126.11 g/mol. Which of the structures shown are possible structures for the substance?
Molecular Properties / Structure |
Stoichiometry : CombustionAnalysis (10 Variations)
While working in the lab, you find a bottle of white powder labeled "analgesic compound #5". Since the original investigator neglected to record the identity of the substance, you decide to perform a combustion analysis to identify the compound. You have a 65.7 g sample that when burned produces 182 g CO2 and 51.7 g H2O. What is the formula of this compound? (The compound only consists of C,H, and O.)
Stoichiometry |
Molecular Properties / Structure
Intermolecular_Forces__Liquids_and_Solids : ClassifySolids (10 Variations)
Classify each of the following substances, in the solid state, as molecular, ionic, covalent network, or metallic.

Substance Appearance Melting Pt. (¬?C) Boiling Pt. (¬?C) Conducts as solid Conducts as liquid
A Colorless crystal -121 20.8 no no
B Colorless crystal 846 1505 no yes
C Silvery gray 1675 3260 yes yes
D Colorless crystal 1713 2590 no no

Solids |
Physical Properties
Thermochemistry : CalcHBondEnergy (14 Variations)
Use the bond energies given in to estimate the Ho for the reaction given below:

hint: both carbon dioxide and molecular oxygen have double bonds

Calorimetry / Thermochemistry |
Solutions : GramsToMolalSoln (20 Variations)
How many grams of citric acid need to be added to 750 ml of ethanol to make a 0.50 m solution?

Density (g/ml)

Molecular Weight (g/mol)

Citric acid






Solutions / Solvents |
Nomenclature / Units / Symbols |