1 / 17

Chemistry Review: Bohr Diagrams, Periodic Trends, and Chemical Formulas

Learn about Bohr Diagrams and how electrons appear predictably in shells, Periodic Trends, and balancing chemical equations. Understand naming and writing formulas of chemical compounds like magnesium nitride. Discover nuclear fission and fusion processes.

onawa
Download Presentation

Chemistry Review: Bohr Diagrams, Periodic Trends, and Chemical Formulas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. UNIT 2 REview Science 10

  2. Bohr Diagrams • Electrons appear in shells in a very predictable manner. • There is a maximum of 2 electrons in the first shell, 8 in the 2nd shell, and 8 in the 3rd shell. • The period # = # of shells in the atom. • Except for the transition elements, the last digit of the group # = # of electrons in the valence shell

  3. Periodic Trends • Look at Elements on the periodic table and be able to determine • Protons • Electrons • Mass number • Atomic number • Net charge (if possible) Of the stable atoms and the isotopes.

  4. Naming/Writing formulas of chemical compounds • Name and write formulas for Ionic and covalent compounds • magnesium and nitrogen • Magnesium nitride

  5. K3N • K3N • A. Step 1 Identify the ions K=potassium N=Nitrogen Step 2 check the charges K=+1 N=-3 Step 3 Determine the ratio 3 potassium ions for every nitrogen ion

  6. K3N • Balance the charge therefore means that potassium must have a charge of +1 if it takes 3 potssium ions to balance a charge of -3 • Or you could cross the subscripts back over to superscripts • K3 N1 • K+1N-3 • Potassium nitride

  7. potassium bromide • Step 1: determine the charges and symbols Potassium=___ Charge: +1 Bromide=____ Charge: -1

  8. Step 2 write superscripts with the symbols and cross over the subscripts • K+1 Br-1 • K1 Br1 • Answer is: KBr When writing names for multivalent formulas make, cross the subscripts back to superscripts then verify that the charge does exist on the periodic table.

  9. Balancing equations • Go from word equations to skeleton equation • Balance equation using the plan strategy • 1.leave anything that appears in more than one species (or compound) to end • Leave elemental forms • Balance groups (polyatomic ions) • Let the coefficients lead you • Classify as S, D, SR, DR, C, N

  10. Example • See overhead

  11. Know how to use the PH charts • Need to know how to determine whether a chemical is an acid or a base according to what colour the indicator has turned

  12. Radioactive Decay • Alpha decay • Beta decay • Gamma decay • See overhead for example

  13. Nuclear Fission and fusion • Fission • Splitting of more massive nucleus into two less massive nuclei, subatomic particles and energy • Induced or forced • Rules • 1. mass of numbers on each side of equation stays the same • 2. Sum of the charges on each side of equation stays the same

  14. Fission • See overhead for example

  15. Fusion • Two low mass nuclei join to form a more massive nuclei • Occurs in the sun • Study Table 7.11 page 321

  16. Fusion • Example see overhead

More Related