192012 Standards 3 Conservation of Matter Stoichiometry Objectives
1/9/2012 Standards: 3 (Conservation of Matter & Stoichiometry) Objectives: a. Be able to balance and classify chemical reactions DO NOW: 1. Get out sheet we used last wk before vacation, called Balancing Equations (Std 3) AND Copy classifying codes for chem. eqns. HOMEWORK: 1. Print Chemistry 1: Ch 1 -11 Review for Final for S 1 – Taylorson (1 pt) Std MISC 2. Print LAB – Solubility of Some Ionic Compounds (1 pt) Std 3 3. Write balance equations and classify reactions Ch 10. 1 p. 285 -286 14 -20. INSTEAD OF FOLLOWING THE DIRECTIONS IN THE TEXTBOOK!!! 4. Watch the video I showed you in class today. (5 pts) Std 3 a. Write down all 5 equations that are balanced in the vid, and balance each. b. For each equation classify in as many ways as you can using the codes we learned in class today. ============================= STAMPS: None
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Show only the first equation balancing in class. A Beginners Guide to Balancing Equations (You. Tube) You need to watch this entire video at home tonight as homework, be sure to copy all 5 equations, balance each, and classify each using the codes we will learn in class today.
Below are abbreviations for the classifying of chemical reactions. We will use these with the Worksheet – Balancing Equations. a. SYN - Synthesis – p. 284 b. COM - Combustion – p. 285 A + B ---> C c. DEC - Decomposition – p. 286 d. SR - Single Replacement – p. 287 A + O ---> C e. DR - Double Replacement - p. 290 A ---> B + C f. Ox-Red - Oxidation/Reduction (aka redox) – p. 636 AB + C ---> CB + A g. AB – Acid/Base - p. 295 2 AB + CD ---> AD + CB Charge on ions chg Acid + Base ---> H 2 O + salt Salt = metal + non-metal Acids have H+ ions Bases have OH- ions Acid Examples HCl H 2 SO 4 H 3 PO 4 Base Examples: Na. OH Ca(OH)2 Al(OH)3
Below are abbreviations for the classifying of chemical reactions. We will use these with the Worksheet – Balancing Equations. Salt = metal + non-metal Acids have H+ ions Bases have OH- ions Acid Examples HCl H 2 SO 4 H 3 PO 4 Base Examples: Na. OH Ca(OH)2 Al(OH)3
DEC Ox-Red
1/10/2012 Standards: 3 Objectives: a. Students will start their final review now, not the night before the exam. b. Prepare for Friday's’s lab - Solubility of Some Ionic Compounds B c. Review and practice balancing and classification of reactions DO NOW: 1. Define solubility 2. Classify & balance all homework problems. (see #3 and #4 in "Stamps") HOMEWORK: 1. Complete, balance and classify all reactions on the first row of the lab data sheet ( Pb(NO 3)2 with each of the other 11 chemicals on this row). (5 pts) Std 3 ============================== STAMPS: Journal 1/9 1. Write balance equations and classify reactions Ch 10. 1 p. 285 -286 14 -20 (3 pts) Std 3 2. Watch the video I showed you in class today. (5 pts) Std 3 Basket First all 5 equations, balanced and classified.
DO NOT FILL IN THESE BOXES NOW!!!! This is your data sheet for the lab.
1/11/2012 Standards: 3 Objectives: • Be able to write word, skeleton, and balanced equations DO NOW: 1. Textbook - p. 304 71 (3 words equations, skeleton equations for each, balance skeletons, and classify each. HOMEWORK: 1. Ch 10 Assess - p. 305 72, 73, 77, 78. You are copying 8 word equations, creating 8 skeletons, balancing the skeletons, and classifying each equation. (5 pts) Std 3 ============================ STAMPS: Journal 1/9 & 1/10 BASKET FIRST 1. Equations complete and balanced, and classified, from row 1 of lab data sheet (5 pts) Std 3 from yesterday 3. Write balance equations and classify reactions Ch 10. 1 p. 285 -286 14 -20 (3 pts) Std 3 4. Watch the video I showed you in class today. (5 pts) Std 3 all 5 equations, balanced and classified.
Complete and Balance 1 Answer?
2 Answer?
3 Answer?
1/12/2012 Standards: 3 Objectives: a. Be able to write ionic and net ionic equations b. Be able to use Solubility Chart (Today's Handout) DO NOW: 1. Define and give one example of each: Ionic equation, net ionic equation (see pages 293 -294) HOMEWORK: 1. PRINT & FOLLOW DIRECTION - Solubility of Some Ionic Cmpds - Follow-up Sheet - Do everything but the "Expt Result" column. (5 pts) Std 3 ============================ STAMPS: Journal 1/10 & 1/11 1. Ch 10 Assess - p. 305 72, 73, 76, 77. You are copying 8 word equations, creating 7 skeletons, balancing the skeletons, and classifying each equation. (5 pts) Std 3 2. Any HW that whole class is not stamped.
4 Answer?
Balanced Chemical Equation Complete Ionic Equation (separate ions) Net Ionic Equation (only ions that react - form compounds)
Balanced Chemical Equation Complete Ionic Equation (separate ions) Net Ionic Equation (only ions that react - form compounds) GUIDED PRACTICE
1/13/2012 Standards: 3 Objectives: a. Be able to complete lab Solubility of Some Ionic Compounds - due end of period - 15 points DO NOW: 1. Read lab instructions silently to yourself. HOMEWORK: 1. Ch 10 Assess p. 305 – 306 90 -92 Write ionic, net ionic and classify all equations (5 pts) Std 3 Solids will be identified with (s) , liquids (l) , gases (g) Solids, liquids and gases - none of these are written as ions in ionic equations. ============================ ab due end of period. Data sheet complete and questions answered. L Homework will be stamped on Tuesday
In chemical equations you may see these subscripts: (l) = pure liquid (g) = gas consider as product if on (s) = solid the right (aq) = dissolved in water (written as ions) If you have any of these on the right side of the equation, that means a reaction will occur! (l) , (g) , (s)
Example: H 2 SO 4 (aq) + Ca. CO 3 (s) ----> H 2 O(l) + CO 2 (g) + Ca. SO 4 (s) Complete ionic and net ionic equations are the same for this equation.
This video will define 4 important terms. Then, 3 actual homework problems will be solved and explained. p. 305 -306 90 -92 (all)
The following subscripts are used in this HW, you will see them used in the future. aqueous - PO 43 - (aq) perhaps from the acid H 3 PO 4 (aq) ions dissolved in water solid - Ag 2 S (s) will not dissolve in water. When an (aq) solution of a compound 1+ containing Ag ions is mixed with an (aq) solution of a compound containing Cl 1 - ions, Ag 1+ ions "stick" to Cl 1 - ions to form Ag 2 S (s) solid which will not dissolve in water. gas - HCl (g) This is hydrogen chloride (the gas). When bubbled into water, it will form hydrochloric acid which forms H+(aq) ions and Cl 1 -(aq) ions in the water liquid - H 2 O (l) Liquid isn't just the state of the substance in this case. Liquid means "pure" water. It is formed as a product in a reaction.
p. 305, 90 (c) S o ig h e e H 2 O Notice: equaton was balanced for you already 2 HCl. O(aq) + Ca(0 H)2 (aq) -----> 2 HOH (l) + Ca(Cl. O)(2) (aq) IONIC EQUATION 2 H 1+ + 2 Cl. O 1 - + Ca 2+ + 2 0 H 1 - -----> 2 HOH (l) + Ca 2+ + 2 Cl. O 1 NET IONIC EQUATION H 1+ + 0 H 1 - -----> HOH (l) 2 H 1+ 2 Cl. O 1 - Ca 2+ 2 0 H 1 - 2 HOH (l) Ca. Cl. O
This video will define 4 important terms. Then, 3 actual homework problems will be solved and explained. CONTINUED - Part 2
p. 305, 91 Notice: this equation is not balanced, but I have balanced the molecules and predicted the formation of HBr 3+ 1 - 3+ 2 - 3 H 2 S(aq) + 2 Fe. Br 3 () -----> Fe 2 S 3 (s) + 6 HBr (aq) must be balanced IONIC EQUATION 1+ 2 6 H + 3 S + 2 Fe 3 - + 6 Br 1 - -----> Fe 2 S 3 (s) + 6 H 1 - + 6 Br 1 - NET IONIC EQUATION 3 S 2 - + 2 Fe 3 - -----> Fe 2 S 3 (s) 2 H 1+ S 2 - Fe 3+ 3 Br 1 - -----> 2 Fe. S 3 (s) + HBr S o g t. xe
p. 306, 92 (a) Notice: equation was balanced for you in text H 3 PO 4 (aq) + 3 Rb. OH (aq) -----> 3 H 2 O (l) + Rb 3 PO 4 (aq) IONIC EQUATION 3 H 1+ + PO 43 - + 3 Rb 1+ + 3 OH 1 - -----> 3 H 2 O (l) + 3 Rb 1+ + PO 43 - NET IONIC EQUATION H 1 - + OH 1 - -----> H 2 O (l) 3 H 1+ PO 43 - + 3 Rb 1+ 3 OH 1 - -----> 3 H 2 O (l) + 3 Rb 1+ 1 PO 43 - S o ig h e e
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