chemistry week 18 - weebly
TRANSCRIPT
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Chemistry Tuesday, January 10 – Wednesday, January
11, 2017
Do-Now: “BrainPOP: Chemical Equations” 1. Write down today’s FLT 2. What do you think a chemical reaction is?
(Write what you think, even if you’re not sure) 3. Write down an example of a chemical reaction
(it could be anything you think is an example) 4. Sketch what you think a chemical reaction might
look like. 5. Write down the formula for Aluminum oxide. 6. Number 1-10 underneath your do-now.
Take out your planner and ToC
Announcements • Semester2!• NoSchoolMonday1/16–MLK,Jr.Day• Startthinkingaboutwhatclassesyouwanttoregisterfornextyear
• Requiredmaterials:– Notebookorbinder– AssignedPT– ScienKficcalculator(musthavethissemester)
Announcements • WeightedGrades
– 10%HW/CW– 25%Labs– 65%Quizzes/Tests
• Q3MidtermExempKon– 70%+tests,<5missingToCassignments,nomissinglabs/quizzes
• Retakes?– Clearmissingworkfirst
Announcements • DojoPoints• Tradeinoutsideofclass
– 5pts–pen,pencil,cardinalpoints,borrowcalculator,snack
– 10pts–periodictable– 15pts– ToCstamp– Mostpts–Mysteryprizeatendofquarter
Planner: • Read Ch. 11 • Finish worksheet & get stamped
Table of Contents #1: 1. BrainPOP: Chemical Equations 2. Cornell Notes: 11.1 A 3. 11.1 WKS A
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BrainPOP:ChemicalEqua8ons• WatchtheBrainPOPvideo• Acerthevideo,answerthequesKonsinyourgroup–everymembermustcopydownthesameanswer
• Thegroupwiththemostcorrectanswersà+5dojopointseachh;ps://www.brainpop.com/science/ma;erandchemistry/chemicalequa8ons/
FLT • I will be able to translate a word
equation into a chemical equation by completing 11.1 Notes A
Standard HS-PS1-7:Usemathema8calrepresenta8onstosupporttheclaimthatatoms,andthereforemass,areconservedduringachemicalreac8on
Ch. 11: Chemical Reactions 11.1 Cornell Notes A • Add assignment # • Copy down all bolded ideas • Noise level 0 • Raise hand to question/comment • Be prepared to pair-share-respond
11.1: Describing Chemical Reactions
Recall
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Recall • We have nomenclature rules in
chemistry that allow us to write chemical formulas
MgCl2
FeCl2 NaNO3 CCl4
Chemical Reactions
Chemical Equations • Chemical Equation = Shorthand
for a chemical rxn using formulas and symbols
Chemical Equations
• There are two parts to a reaction: 1. Reactants = substances you start
with 2. Products = substances you end
up with
All Chemical Reactions… • The reactants will turn into the
products Reactants à Products
- Page 321
Reactants Products
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Which are the reactants, which are the products?
• H2 + O2 à H2O
• Na + Cl2 à NaCl
• Ca3N2 + NaCl à CaCl2 + Na3N
Describing Chemical Rxns Word equations = words only Ex/ Copper reacts with chlorine to form copper (II) chloride
Describing Chemical Rxns Symbols may be used in equations Copper + chlorine à copper (II) chloride
Describing Chemical Rxns Chemical Equations = uses formulas and symbols
Ex/ Cu + Cl2 à CuCl2
Chemical Rxn Symbols
Symbols • à = “yields” or “reacts to form”
Reactants à Products
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Symbols • + = “and”
Cu + Cl2 à CuCl2
Symbols • States of matter = indicated with
subscripts (s), (l), (g), or (aq)
2H2(g) + O2(g) à 2H2O(l)
Symbols • aq = aqueous = dissolved in water
NaCl(aq) à Na+ + Cl-
Symbols • Double arrow = reversible rxn
(more later)
Symbols • Others: Heat (Δ), energy, and
catalysts can be indicated on arrows
Symbols • A catalyst is a substance that is
added to speed up a reaction, but is not used or consumed by the reaction
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Writing Equations
Writing Equations • Ex 1/ Diatomic bromine and
potassium iodide react to form potassium bromide and diatomic iodide
***NOTE*** • Diatomic gases =
H, N, O, F, Cl, Br, I • Always write as
diatomic if they are by themselves in a chemical equation
Writing Equations • Ex 2/ Iron and oxygen react to form
iron (III) oxide
Try this one: • Ex 3/ Iron (III) sulfide and hydrogen
chloride react to form iron (III) chloride and hydrogen sulfide gas
Now, read these equations:
Fe(s) + O2(g) → Fe2O3(s)
Cu(s) + AgNO3(aq) → Ag(s) + Cu(NO3)2(aq)
NO2(g) N2(g) + O2(g) →
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CW • CompletetheWS• Finished?ReadCh.11quietly
Chemistry Thursday, January 12 – Friday, January 13,
2017
Do-Now: “Cornell Notes 11.1 B” 1. Write down today’s FLT 2. Equations for reactions can be represented
using __________ and ___________. 3. The arrow means __________. 4. If there is a double arrow, it means _____. 5. Write as a chemical equation: Fluorine gas
reacts with iron (III) iodide to produce iodine gas and iron (III) fluoride.
Take out your planner and ToC
Announcements • NoSchoolMonday1/16–MLK,Jr.Day• MakesureyouhaveascienKficcalculator
• TutoringHours– Morning7am-7:50am– Lunch– Acerschoolbyappointment(Tues,Thurs)
Planner: • Study Ch. 11 à Ch. 11 Quiz 1/23 • Finish worksheet & get stamped
Table of Contents #1: 4. Cornell Notes: 11.1 B 5. Balancing Eqs WS
FLT • I will be able to describe the steps for
writing a balanced chemical equation by completing 11.1 Notes
Standard HS-PS1-7:Usemathema8calrepresenta8onstosupporttheclaimthatatoms,andthereforemass,areconservedduringachemicalreac8on
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Ch. 11: Chemical Reactions 11.1 Cornell Notes B • Add assignment # • Copy down all bolded ideas • Noise level 0 • Raise hand to question/comment • Be prepared to pair-share-respond
11.1: Describing Chemical Reactions
Recall
Chemical Equations • Chemical Equation = Shorthand
representation of a chemical reaction using formulas and symbols
Conservation of Mass
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Law of Conservation of Mass • Law of Conservation of Mass =
mass in a closed system can neither be created nor destroyed
Law of Conservation of Mass • What does this mean for us?
– In a balanced chemical equation, the number and kinds of atoms on each side of the equation should be equal.
Law of Conservation of Mass Law of Conservation of Mass
Balancing Equations
Video Notes • Wewillwatchavideoclipaboutbalancingbeforewegoovertherules
• Asyouwatchthevideo,writedownfourthingsyoulearnfromthevideo
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Balancing Equations • Atoms can’t be created or destroyed
in an ordinary reaction: – All the atoms we start with we must
end up with (balanced)
Balancing Equations • A balanced equation has the same
number of each element on both sides of the equation
Balancing Equations • We use coefficients to indicate
multiples of molecules or compounds
Balancing Equations • Coefficients are multiples of the
entire formula • How does this affect each atom?
Coefficients • How many of each type of atom? 1. 3H2O 2. 2NO3 3. 3Ca(NO3)2
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Rules 1. Write out correct formulas (if not
already written) Ex/ Li + H3PO4 à H2 + Li3PO4
Rules 2. Count the # of atoms of each type on both sides
– If possible, keep polyatomic ions together
Ex/ Li + H3PO4 à H2 + Li3PO4
Rules 3. Balance the elements one at a time by adding coefficients in front.
à Generally, balance H, O, & monatomic atoms last
Ex/ Li + H3PO4 à H2 + Li3PO4
Rules 4. Double-check – always Ex/ Li + H3PO4 à H2 + Li3PO4
Rules Never’s: • Never add or change subscripts on
formulas • Never put a coefficient in the middle of a
formula
Example: Oxygen and hydrogen react to form water
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Example 2: C3H8 + O2 à H2O + CO2
Try These: • AgNO3 + Cu → Cu(NO3)2 + Ag
• Mg + N2 → Mg3N2
• P + O2 → P4O10
• CH4 + O2 → CO2 + H2O
CW • BalancingWS-showallwork!• Stamps• StudyCh.11J