CH301 Worksheet 1: High School Chemistry Questions. For each problem, identify the kind of question BEFORE answering it. 1. A 25 kg ball has a kinetic energy of 225 J. What is the speed of the ball? What kind of question is this? _________________ 2. How many molecules of water are there in 100 mL of water? (The density of water = 1.000 g/ml.) What kind of question is this? _________________ 3. Given that the atomic mass of carbon is given as 12.0107 g/mol, what are the approximate relative abundances of the two isotopes 12C and 13C? What kind of question is this? _________________ 4. In the electrolysis of 2H2O Æ 2H2 + O2, how many atom of O in O2 are made from 4 g of H2O? What kind of question is this? _________________ 5. What are the most likely ionic forms of (a) sodium and (b) calcium? What kind of question is this? _________________ 6. What is the product of a reaction between metallic lithium and oxygen, O2? What kind of question is this? _________________ 7. Name the following species: (a) Cl-, (b) NO3-, (c) C3H8. What kind of question is this? ____________ 8. The combustion of ethanol has the following equation: C2H5OH + 3 O2 → 2 CO2 + 2 H2O What mass of CO2 is formed from 1 kg of ethanol? What kind of question is this? _________________ 9. Vitamin K contains 78.95% C, 3.95% H, and 21.05% O by mass. What is its empirical formula? What kind of question is this? _________________ 10. Given that vitamin K (see question 9) has molecular weight of 158.15 g/mol, what is its molecular formula? What kind of question is this? _________________11. When sand is stirred up in a glass of water a (homogeneous of heterogeneous?) mixture is formed. What kind of question is this? _________________ 12. If 10.0 g of hydrochloric acid is dissolved in enough water to make 1.00 liter of solution, what is the molarity of the solution? What kind of question is this? _________________ 13. Balance the following chemical equation: ____ BCl3 + ____H2O → ____ B(OH)3 + ____HCl What kind of question is this? _________________ 14. A microwave oven used radiation at a frequency of 2450 MHz to vibrationally excite water molecules in food. What is the wavelength of this radiation? What kind of question is this? _________________ 15. How may protons, neutrons, and electrons are in the most common atomic form of chlorine? What kind of question is this? _________________ 16. If 75 mL of water is added to 25 mL of 1 M H2SO4 in water, what is the new concentration of H2SO4? What kind of question is this? _________________ 17. Classify the following properties of matter as physical of chemical: (a) color, (b) flammability, (c) density. What kind of question is this? _________________ 18. Rank the following four forms of electromagnetic radiation in terms of decreasing energy: Microwave, X-ray, radiofrequency, yellow light. What kind of question is this? _________________ 19. Which of the following is not a strong acid: HI, H2SO4, HCl, or HNO2? What kind of question is this? _________________ 20. What is the oxidation number of nitrogen in nitrate? What kind of question is this?
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