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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