Tro’s Chemistry Chapter 2 –Atoms and Elements Page 1 of 5Acknowledgements: Some of the images are adopted from Tro’s textbook to aid student learning. Key skills:Law of definite proportions, law of multiple proportions, subatomic particles, atomic mass unit, atomic number, muss number, isotope, atomic weight, predicting charges of ions, converting between mass, mole, and number of atoms, periodic table, period, group, metal, nonmetal, metalloid, anion, cation. Review questions: 3-6, 13-28. Suggested problems:33, 53, 57, 61, 67, 69, 75, 87, 105, 113. FYI–Chapters 1-3 contain brief review of high school chemistry concepts and will be covered promptly. Make sure that you can deal with these materials independently and reliably. A good grade in college chemistry is dependent on that efficiency. Obtain tutoring help in case you couldn’t apply these concepts in problem solving. 2.1. & 2.2 History of Atom 2.3 Modern Atomic Theory and the associated lawsThe Law of Conservation of Mass –(Lavoisier, 1789). In a chemical reaction, matter is neither created nor destroyed. 2 HgO (solid, red) 2 Hg (liquid, shiny) + O2(gas, no color) The Law of Definite Proportions –(Proust, 1779). All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. (Refer to Example 2.1 and Practice 2.1 for problem solving help/hint.) Example: H2O Q33.The mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. A sample of sodium fluoride produced 28.8 g of sodium upon decomposition. How much fluorine (in grams) was formed? The Law of Multiple Proportions –(Dalton, 1804). When two elements (call them A and B) form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.
As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.
Temple University Fox School of Business ‘17, Course Hero Intern
I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.
University of Pennsylvania ‘17, Course Hero Intern
The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.
Tulane University ‘16, Course Hero Intern
Ask Expert Tutors
You can ask 0 bonus questions
You can ask 0 questions (0 expire soon)
You can ask 0 questions
(will expire )