Short ACS Practice Test on Chemistry

Short ACS Practice Test

• Atomic Symbol: An atomic symbol such as 14873Px provides information about the element, including the number of protons, not electrons.

• Covalent Bonding: Elements likely to form covalent bonds include those such P and O.

• Polar Molecules: Polar molecules like H₂S have a dipole moment, while non-polar molecules like CF₄ do not.

• Isoelectronic Species: Isoelectronic species share the same number of electrons, and their size depends on the nuclear charge.

• Balancing Chemical Equations: Using no fractional coefficients, balance chemical equations with the correct coefficients to maintain the conservation of mass.

• Reactions of Lithium Carbide: Lithium carbide (LiₓCᵧ) reacts with water to form LiOH and acetylene (C₂H₂), showing the chemical reaction.

• Hybridization: Sp hybridized central atoms provide insights into bonding in specific molecules shown in the reaction example.

• Simplest Formula of an Oxide: Given the mass of an element and oxygen, calculate the empirical formula of the compound (i.e., simplest formula).

• Percentage of Ni in a Metal Sample: The percentage of nickel in an impure sample, using the given mass of the sample, the resulting gas volume, and the standard condition formula. This represents the calculation relating the formula equation given with the actual mass involved in the reaction

• Boiling Points of Hydrogen Halides: The order of increasing boiling points for hydrogen halides is shown, including the strongest influence of intermolecular forces.

• Solubility of Solids in Water: The solubility rates of specific solids (i.e., AgNO3, CaCO3, PbO, and ZnS) in water at 25°C are compared.

• Mixing Solutions: Mixing specific volumes of solutions results differing precipitates.

• Oxidation Number of Re: The oxidation state of Re in the given compound is calculated.

• Reaction Balancing Coefficients: Balancing a given chemical equation, including calculating the appropriate coefficient for I2.

• Atomic Radius: Comparing the atomic radius size of different chemical elements.

• Electronegativity: The electronegativity value of an element (i.e., S) is compared to that of other elements.

• Molecular Geometry: Determining the geometry of atoms in formamide and the central atom.

• Dipole Moment of Zero: Some molecules lack a net dipole moment despite having polar bonds.

• Lewis Structure Lone Pairs: Determining the number of lone pairs around a central atom in a Lewis structure.

• Neutralizing Stomach Acid: Calculating the number of moles of stomach acid (HCl) that can be neutralized by a given mass of magnesium hydroxide (Mg(OH)2).

• Balancing Half Reactions: Determining the number of electrons needed to balance a half-reaction for the oxidation process of a chemical compound

• Wavelength of Light: Calculating the wavelength of light with sufficient energy to break a hydrogen-hydrogen bond.

• Vapor Pressure at 25°C: Comparing the vapor pressures of different substances (butane, glycerol, and octane) to determine the highest at 25°C

• Quantum Numbers: Sets of quantum numbers (n, l, ml, ms) specify properties of electrons in an atom.

• Ionization Energy: Explain why nitrogen has a higher ionization energy than oxygen.

• Molar Concentrations of Solutions: Calculate the molar concentration of a NaOH solution used in a titration with a known concentration of H₂SO₄ solution.

• Reaction Stoichiometry: Calculate the percent yield of a reaction, given known participating substances in the chemical reaction.

• Moles of Chlorine Ions in Solution: Calculating the number of moles of chloride ions in a solution of magnesium chloride at a given concentration.

• Hybridization: Identifying molecules that have sp³ hybridized orbitals on the central atom and the properties of those orbitals

• Oxidation Numbers: Identifying oxidation-reduction processes and predicting oxidation.

• Bond Strength, Resonance Structures, and Geometries: comparing bond strengths of compounds, showing calculation for resonance structures, and predicting shapes of compounds using VSEPR.

• Molecular Geometry & Orbital Theory: Predicting the molecular geometry of a compound, and determining molecular orbital theory application.

Other Topics

• Bond Polarity: Which species is polar is determined by analyzing the Lewis structure of molecules.

• Quantum Numbers: Determining which set of given quantum numbers (n, l, ml, Ms) is not allowed based on established quantum mechanics.

• Frequency of Light: Calculate the frequency of light given its wavelength.

• Substances with Largest Number of Molecules: Comparing the molecules present in different substances given a mass to determine the largest number of molecules.

• Oxidation-Reduction Reactions: Identify which equations represent oxidation-reduction reactions.

• Intermolecular Hydrogen Bonds: Identifying which substance can form hydrogen bonds with another.

• Highest Boiling Point: Determine which compound has the highest boiling point.

• Oxidation Processes: Determining the situations where an oxidation process in the given reaction is observed.

Test your knowledge with this short ACS practice quiz covering essential chemistry topics. Explore concepts such as atomic symbols, covalent bonding, polar and non-polar molecules, and balancing chemical equations. Perfect for those preparing for ACS exams or chemistry assessments.