Chemistry Monday, March 12th – Tuesday, March 13th,

2018

Do-Now: “Popcorn Lab Do-Now” 1. Write down today’s FLT 2.  Identify the solute and solvent in a cup of

coffee. 3. Molar mass allows me to convert from

_______ to _______ 4.  How many grams of O2 are present in 2.41

moles of O2? Show all work. 5. We will be using bunsen burners today.

Remind me: how do we use them safely? Take out your planner, ToC, and a calculator

Chemistry Friday, March 16th – Monday, March 19th, 2018

Do-Now: “Video Notes: Polar vs. Nonpolar” 1. Write down today’s FLT 2. Draw a water molecule and label the

hydrogen, oxygen, and charges. 3.  Is ice more or less dense than water? 4. Define the word “solution”. 5. Explain if a glass of saltwater is a solution

or not. 6. Take out your planner and ToC.

Video Notes: Polar vs. Nonpolar •  Let’swatchavideoonpolarandnonpolarmolecules

•  Focusontheexamplesandanalogies–don’tgettoofocusedontermswedon’tunderstandyet

•  Duringthevideo,takefivenotes(intheformoffacts,examples,ordiagrams)ofwhatyoulearn

FLT •  I will be able to identify the factors that

determine the rate at which a solute dissolves by completing Solutions CN B

Standard HS-PS1-3:Planandconductaninvestigationtogatherevidencetocomparethestructureofsubstancesatthebulkscaletoinferthestrengthofelectricalforcesbetweenparticles.

Homogeneous vs. Heterogeneous

Mixtures • Mixturesarecombinationsoftwoormoredistinctsubstances

• Mostnaturalsubstancesexistasmixtures– Ex/Evenwatercontainsimpurities,andthereforeexistsasamixture

Homogeneous vs. Heterogeneous • Homo=same,Hetero=different• Homogeneousmixture=uniformthroughout(solutions)– Ex/Saltwater,Air

Homogeneous vs. Heterogeneous • Homo=same,Hetero=different• Heterogeneousmixture=non-uniformthroughout(unevenlydistributed)– Ex/Saltwaterwithsandinit

Non-Homogeneous Mixtures

Mixtures that are NOT Solutions: •  Suspensions=mixturesw/largeparticlesthatslowlysettle(ex/sandywater)– Particlesofasuspensionaregreaterindiameterthan1000nm.

– Canbeseparatedbyfiltering(p.459)

Mixtures that are NOT Solutions: •  Colloids=heterogeneousmixturesw/mediumsizeparticles

•  Betweenthesizeofsuspensionsandtruesolutions(1-1000nm)

•  Ex/Blood,milk

Pair-Share-Respond 1.   Distinguishbetweenhomogeneousand

heterogeneousmixtures2.  Whatarethetwotypesofheterogeneous

mixtures?3.   Provideanexampleofahomogeneous

mixture4.   Provideanexampleofaheterogeneous

mixture

Dissolution

Dissolution •  Recall-The“nature”(polarity,orcomposition)ofthesoluteandthesolventwilldetermine…– Whetherasubstancewilldissolve– Howmuchwilldissolve

Dissolution •  Youareaddingsugartoyourtea,butyounoticethatit’snotdissolving.Whatdoyoudo?

Dissolution • Whichwoulddissolvefaster–asugarcube,orgranulatedsugar?

Dissolution •  FactorsAffectingtheRateofDissolution:

1.  Stirring/Agitation •  increases contact b/t solute & solvent

particles

Dissolution 2.  Surface Area (of solute)

•  Smaller pieces = more SA = more contact

Dissolution 3.  Temperature

•  High T = Particles move faster = more contact

•  High T can also increase the total amount of solute that will dissolve

Saturation

Saturation •  Solubility=maxamtofsubstancethat

willdissolveataspecificT.•  Units=gsolute/100gsolvent

Saturation •  UnsaturatedSoln’=Canstilldissolve

moresolute–  Ex/Solutecompletelydisappears

Saturation •  SaturatedSoln’=Containsthemaxamt

ofsolutedissolved.

Saturation •  SupersaturatedSoln’=Containsmore

thanittheoreticallycandissolve

Solubility

Solubility •  éTemperature:

–  ésolubilityforsolidsandliquids

•  Ex/Sugarintea–  êsolubilityfor

gases•  Ex/Gasescapes

fromliquidwaterwhenboiling

Solubility •  Whataboutpressure?•  Henry’sLaw=Solubilityofagasina

liquidisdirectlyproportionaltothePofthegasabovetheliquid

– Ex/ When you remove the cap of a bottle of soda, you release pressure, and then the gas starts to escape

Solubility •  Ofcourse,there’sanequation

Miscibility

Liquids •  Miscible=Whentwoliquidscanmix/

dissolve–  Waterandantifreezemixanddissolve

Liquids •  Someliquidsareonlypartiallymiscible

–  Ex/Waterandether

Liquids •  Immiscible=Cannotmix/Dissolve

–  Ex/Oilandvinegar

Pair-Share-Respond 1.   Listthreefactorsthataffecttherateof

dissolution2.   Explainhoweachofthosethreefactors

affectstherate3.   Youaddasolute,andnoticethatitall

disappearsinthesolvent.Isthissolutionsaturated,unsaturated,orsupersaturated?

4.   Ifyouincreasethetemperature,willasoliddissolvefasterorslower?

5.   Ifyouincreasethepressure,willagasdissolvefasterorslower?