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
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.
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
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 • Recall-The“nature”(polarity,orcomposition)ofthesoluteandthesolventwilldetermine…– Whetherasubstancewilldissolve– Howmuchwilldissolve
Dissolution • FactorsAffectingtheRateofDissolution:
1. Stirring/Agitation • increases contact b/t solute & solvent
particles
Dissolution 3. Temperature
• High T = Particles move faster = more contact
• High T can also increase the total amount of solute that will dissolve
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
Pair-Share-Respond 1. Listthreefactorsthataffecttherateof
dissolution2. Explainhoweachofthosethreefactors
affectstherate3. Youaddasolute,andnoticethatitall
disappearsinthesolvent.Isthissolutionsaturated,unsaturated,orsupersaturated?
4. Ifyouincreasethetemperature,willasoliddissolvefasterorslower?
5. Ifyouincreasethepressure,willagasdissolvefasterorslower?