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Grab binders, handouts & begin the Do Now
1. When making soap all of my ingredients weighed 124g. According to the Law of Conservation of Mass, how much should my solidified bar of soap weigh? 2. Determine which of the 5 types of chemical reactions is shown for each a. HCl + Mg à MgCl + H2 b. NaHCO3 + CH4CO2 CO2 (g) + H2O (l) + C2H3O2Na c. Pb(NO3)2 (aq) + KCl (aq) KNO3 (aq) + PbCl2 (s) 3. Make an atom inventory for the reactants in reaction (b) shown above. 4. Identify the atomic masses for each of the following elements: Hydrogen (H), Oxygen (O), Xenon (Xe), Calcium (Ca)
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Parts of a Chemical Reaction Equation
C3H8(aq) + O2(g) 3CO2(g) + 4 H2O(l)
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Balancing Reactions Notes
Key Point 1: - The law of conservation of mass is represented by balanced reactions # of atoms on the reactants side = # of atoms on the product side
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Balancing Reactions Puzzle
Time Directions 8 min Complete “Identifying Balanced Reactions”; questions 1 – 4 5 min With a partner, use M&M’s to balance our first unbalanced chemical reaction equation; questions 1 – 4
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Balancing Reactions Notes
Steps to Balancing Reactions: 1. Make an atom inventory of reactants and products 2. Alter coefficients to balance atoms 3. Balance your HO’s last!
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Balancing Reactions Notes
Directions: Balance the following equations: 1) HCl + Mg à MgCl + H2 2) NaHCO3 + CH4CO2 CO2 (g) + H2O (l) + C2H3O2Na 3) Pb(NO3)2 (aq) + KCl (aq) KNO3 (aq) + PbCl2 (s)
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The Mole & Molar Mass Notes
What do the following all have in common?
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The Mole & Molar Mass Notes
Which of the following doesn’t belong? Dozen Couple Few Baker’s Dozen Ten
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The Mole & Molar Mass Notes
Key Point 1: Mole = a counting unit 1 mole = 6.02 x particles Tells us how many particles of a compound are actually involved in a reaction 602,000,000,000,000,000,000,000 particles Avogadro’s Number!
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Key Point #2: Molar Mass Molar Mass = the mass of 1 mole of a substance Tells us what mass of a substance is used in a reaction Units = grams per mole (g/mol) Example: 1 mole of Magnesum= 24g Molar Mass of Magnesium = 24g/mol
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Steps to Calculate Molar Mass of Compounds:
Count out the atoms in the compound Look up the Molar Mass for each element Multiply the Molar Mass of each element by the # present in the compound Sum the Molar Masses
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Calculate the Molar Mass of the following
1) NO2 2) SO2 3) C6H12O6 4) (NH4)3PO4
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Calculate the Molar Mass of the following
1) NO2 = 46g/mol 2) SO2 = 64g/mol 3) C6H12O6 = 180g/mol 4) (NH4)3PO4 = 149g/mol
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Lab 3: Aspirin Lab Question: Are brand name commercial prescription drugs better than generic or homemade prescription drugs? Directions: 20 min… - Determine the WHAT & HOW part of your purpose - Draft your introduction - Read the lab background and complete the hypothesis and Pre-lab questions
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HONORS: Mole Calculations
Multiply by Avogadro’s Number Moles Particles Divide by Avogadro’s Number
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Exit Ticket 4 Directions: You have 5 minutes to complete the Exit Ticket to the best of your ability. You MAY NOT use notes, but you may use a Periodic Table. When finished submit to the class bucket and put up your binder.
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