LET’S GET REAL 1. What is an acid? What are the common properties? 2. What is a base? What are the common properties? 3. List 4 strong acids. End T YING IT ALL TOGETHER Previous Exit Slip Problems: 1. What are two properties of an acid ? 2. What is an Arrhenius acid ? 3. What makes something a strong or weak base? WHAT DO ALL OF THESE ATHLETES HAVE IN COMMON? GILBERT LEWIS TODAY’S LEARNING TARGET 6.7 – I can discuss the differences between Arrhenius, Bronsted-Lowry, and Lewis acids/bases. I can identify a compound as being one or more of the following. TODAY’S FOCUS QUESTION Why did acids and bases cause Gilbert Lewis to kill himself? ACID/BASE READING Popcorn read the reading you picked up. Read it aloud and answer the questions once you are done. RECALL What What What What is is is is an Arrhenius acid? an Arrhenius base? a Bronsted-Lowry acid? a Bronsted-Lowry base? ARRHENIUS ACIDS/BASES An Arrhenius acid gives a H + to a solution in an acid/base reaction An Arrhenius acid will have a H in its chemical compound (e.g. HCl, HNO 3, H 2SO 4, etc.) An Arrhenius base gives an OH - to a solution in an acid/base reaction An Arrhenius base will have an OH in its chemical compound (e.g. NaOH, KOH, Ca(OH) 2, etc.). BRONSTED-LOWRY ACIDS/BASES Refined Arrhenius’ theory of acids/bases Bronsted-Lowry Acid – Donate (give) a H + to solution Bronsted-Lowry Acid – Accept (take) a H + from solution. All Arrhenius acids/bases are Bronsted-Lowry acids/bases, but not all Bronsted-Lowry acids/bases are Arrhenius acids/bases. TABLE TALK Label the acid and base in this reaction, determine whether it is Arrhenius, Bronsted-Lowry, or both HCl + H 2 O H 3 O + + Cl - LEWIS ACIDS AND BASES To be an acid/base, a molecule does not necessarily have to contain H + . Lewis acid – An atom, ion, or molecule that accepts an electron pair to form a covalent bond. Lewis base – An atom, ion, or molecule that donates an electron pair to form a covalent bond. Therefore, acid/base reactions are ultimately about the transfer of electrons. CLASS EXAMPLE Label the Lewis acid and the Lewis base in the following reaction: BF 3 + F - BF 4- CLASS EXAMPLE Label the Lewis acid and base in the following reaction. Could it also be Arrhenius and/or Bronsted-Lowry? H + + NH 3 NH 4+ TABLE TALK Label the Lewis acid and the Lewis base in the following reaction: BF 3 + NH 3 BF 3NH 3 STOP AND JOT Label each reactant as either a Lewis acid or a Lewis base. AlCl 3 + F - AlCl 4- SUMMARIZE RELAY RACES Competing with your table Answer the questions one at a time. EVERYONE MUST ANSWER QUESTIONS WHEN IT IS THERE TURN. Next group member should check previous answer before moving on. RELAY RACE QUESTIONS For 1-4, label the acid and base in each of the reactions and say whether it is Arrhenius, Bronsted-Lowry, and/or Lewis. It can be a combination of all of these. 1. H 2 CO 3 + H 2 O HCO 3 - + H 3 O + 2. HF + H 2 O F - + H 3 O + 3. BF 3 + F - BF 4 4. HCl + NH 3 NH 4 + + Cl 5. List all of the strong bases 6. List all of the strong acids TODAY’S LEARNING TARGET 6.7 – I can discuss the differences between Arrhenius, Bronsted-Lowry, and Lewis acids/bases. I can identify a compound as being one or more of the following. WORK TIME Begin working on your homework There will be an exit slip after this LEARNING LOG ASSESSMENT Rate yourself 1 – 4 on LT 6.7 EXIT SLIP 1. For the following reactions, identify the reactants as Arrhenius acids/bases, Bronsted-Lowry acids/bases, and/or Lewis acids/bases: a. NaOH + HCl H 2O + + NaCl b. BF 3 + F - BF 4- LEARNING LOG ASSESSMENT Using your exit slip score, rerate yourself on LT 6.7 CLOSING TIME Exam next Thursday/Friday 1 st character evaluation and awards next Thursday/Friday 1 st binder check next Thursday/Friday