Chem_Prat_Exam - Practice Chemistry Placement Exam with Weblinks for Self-Guided Tutorial

Sep 29, 2026

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Practice Chemistry Placement Exam with self-guided tutorial web links and multiple-choice questions covering core chemistry concepts. Items assess electron configuration and valence electrons, atomic sublevels and orbitals, gas behavior and the ideal gas equation, chemical bonding and immiscibility, concentration and dilution calculations, molarity and molar mass at STP, solution percent by mass, molecular shapes, and stoichiometry. It also includes balancing reactions, limiting reagent style problem framing, and composition questions such as percent nitrogen in a compound.

LanguageEnglish

CategoryExam

FormatPDF

Pages7

Reading Time18 min

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Practice Questions

Topics Covered

PRACTICE CHEMISTRY PLACEMENT EXAM with Weblinks for Self-Guided Tutorial 1. An atom with an electron configuration of 1s2 2s2 2p3 has how many valence electrons? Khan Academy: Electron Configurations; ChemTutor: Atomic Structure a. 2 b. 3 c. 4 d. 5 e. 7 2. The _________ sublevel of an atom has a total of five orbitals. Khan Academy: Quantum Numbers and Orbitals; ChemTutor: Atomic Structure a. s b. p c. d d. f e. g 3. You give a child a balloon, and he goes outside with it to play in the snow. Soon, he returns crying. What happened? Khan Academy: Ideal Gas Equation; ChemTutor: Gases a. The balloon expanded and burst. b. The balloon froze solid. c. The balloon shrank. d. The balloon dissolved. e. The child forgot Charles’ Law. 4. What kind of bonding occurs in the compound potassium oxide? Khan Academy: Types of Chemical Bonds a. ionic b. nonpolar covalent c. polar covalent (double bond) d. polar covalent (single bond) e. None of the above 5. A gas with a temperature of 21.0oC and a volume of 10.0 L is compressed to 5.00 L. What will be the new temperature? Khan Academy: Ideal Gas Equation; ChemTutor: Gases a. 10.5 oC b. 420. oC c. 42.0 oC d. –126 oC e. 315 oC 6. Which of the following sublevels does not exist as written? Khan Academy: Quantum Numbers and Orbitals a. 3f b. 6f c. 2s d. 5d e. 8s 7. What is the molecular shape of PH3? Khan Academy: Hybridization and Hybrid Orbitals a. tetrahedral b. trigonal planar c. bent d. linear e. trigonal pyramidal 8. What is the percent by mass concentration of sodium bromide in a solution which contains 50.0 g of sodium bromide in 200.0 g of water? ChemTutor: Solutions a. 40.0 % b. 20.0 % c. 25.0 % d. 33.3 % e. 50.0 % 9. How many milliliters of 6.00 M HCl solution would be required to prepare 2.00 L of 0.140 MHCl by dilution? ChemTutor: Solutions a. 420 mL b. 168 mL c. 85.6 mL d. 46.7 mL e. 30.0 mL 10. What is the molar concentration of 2000. mL of aqueous solution containing 135 g of glucose, C6H 12O6? ChemTutor: Solutions; Khan Academy: Introduction to the Atom a. 12.15 M b. 0.750 M c. 67.5 M d. 0.667 M e. 0.375 M 11. What is the formula of copper (II) sulfate pentahydrate? ChemTutor: Compounds a. Cu2(SO4)2 . 5 H2O b. Cu2(SO4) . 5 H2O c. CuSO4 . 6 H2O d. CuSO4 . 5 H2O e. None of the above 12. What is the electron configuration for the nitride ion? Khan Academy: Electron Configurations; ChemTutor: Compounds a. 1s2 2s2 2p 1 b. 1s2 2s2 2p3 c. 1s2 2s2 2p5 d. 1s2 2s2 2p6 e. None of the above 13. A tank has a pressure of 30.0 atm at a temperature of 22.0oC. After heating, the temperature rises to 35.0oC. What is the new pressure? Khan Academy: Ideal Gas Equation; ChemTutor: Gases a. 54.3 atm b. 31.3 atm c. 28.7 atm d. 47.7 atm e. 30.6 atm 14. Which pair is immiscible? ChemTutor: Solutions; Khan Academy: Solubility a. ethanol and water b. water and octane, C8H 18 c. isopropyl alcohol and water d. acetic acid and water e. octane and oil 15. How many grams of sodium hydroxide are required to prepare 250.0 mL of a 6.00 M solution? ChemTutor: Solutions; Khan Academy: Introduction to the Atom a. 1.50 g b. 0.0375 g c. 0.600 g d. 3.75 g e. 60.0 g 16. 5.60 L of a gas at STP has a mass of 13.0 g. What is the molar mass of the gas? Khan Academy: Ideal Gas Equation; ChemTutor: Gases a. 33.2 g/mol b. 66.4 g/mol c. 26.0 g/mol d. 52.0 g/mol e. none of the above 17. What volume of 0.62 M sodium hydroxide is required to neutralize 20.00 mL of 0.391 nitric acid? Word reaction with reactants only. (Students should predict products) : Sodium hydroxide + nitric acid Khan Academy: Balancing Chemical Equations; ChemTutor: Reactions, Stoichiometry a. 23.6 mL b. 16.9 mL c. 9.03 mL d. 11.8 mL e. none of the above 18. How many moles are in 20.0 g of sodium carbonate? Khan Academy: In

FAQs

What topics are covered in the practice chemistry placement exam?

The exam covers electron configuration and valence electrons, orbitals and sublevels, gas laws and ideal gas calculations, chemical bonding, solution concentration (percent by mass, molarity, dilution), molecular shape, and stoichiometry including reaction balancing and gas mass/mole relationships.

How are gas law and concentration questions typically handled?

Gas questions use the ideal gas equation to relate pressure, temperature, volume, and resulting temperature or pressure after compression/heating. Concentration problems apply percent by mass and molarity/dilution relationships to calculate new temperature, required volumes, or molar concentrations.

Does the exam include stoichiometry and balancing reactions?

Yes. Several questions require predicting products from word reactions, determining coefficients from balanced equations, and using given masses or moles to compute grams of reactants or products. A balancing-chemical-equations step is explicitly referenced in the problems.

Sep 29, 2026

Upload by dbqoiu