Neuron Nudge 2/5 Which of the following represents a physical change? Explain how you know.

Required Prior Knowledge Learning Objective(s) Classwork 2/5 Required Prior Knowledge Learning Objective(s) Next Steps Chemical and physical changes Chemical equations I can distinguish between chemical and physical changes. I can balance chemical equations. I can describe reactions in solution. LEAVE THIS BLANK

Chemical vs. Physical Chemical: bonds are broken and new bonds are formed Physical: bonds are the same before and after How can you tell?

Chemical Reactions What is…and what isn’t? What is…and what isn’t? Part 2

Balanced Chemical Equations What do they show? Reactants and products Phases Conservation of matter and charge  balance using coefficients Moles on left = moles on right Charge on left = charge on right

Check Your Answers

Precipitation Reactions Formation of precipitate drives chemical reaction Know your solubility rules! Look for two aqueous solutions as reactants

Predict KNO3(aq) + BaCl2(aq) Na2SO4(aq) + Pb(NO3)2(aq) KOH(aq) + Fe(NO3)3(aq)

Observe No reaction White precipitate, PbSO4 Reddish-brown precipitate, Fe(OH)3

Writing Equations for Reactions in Solution Complete balanced equation Everything written as compounds (even aqueous) Complete ionic equation Dissociated ionic compounds are written as ions Net ionic equation Only ions involved in reaction are included Spectator ions are not written

Try It: Precipitation Reactions Aqueous potassium chloride is added to aqueous silver nitrate to form a silver chloride precipitate plus aqueous potassium nitrate. Aqueous potassium hydroxide is mixed with aqueous iron (III) nitrate to form a precipitate of iron (III) hydroxide and aqueous potassium nitrate.

Try It: Predicting Precipitation Products Solutions of lead nitrate and potassium choride are mixed. Solutions of sodium sulfate and calcium bromide are mixed. Solutions of aluminum acetate and lithium hydroxide are mixed. Solutions of iron(III) sulfate and sodium sulfide are mixed.

Try It: Predicting Precipitation Products Solutions of aluminum sulfate and calcium hydroxide are mixed. Solutions of potassium chromate and lead acetate are mixed. Solutions of silver nitrate and ammonium sulfide are mixed.

Evaluate (Next Steps) Confident students: How will you make sure you remember this content? Confused or uncertain students: What questions do you have? How will you make sure you master this material before our next test or quiz?

Homework Practice Naming Compounds (Writing Formulas…) Finish predicting precipitation products Check Qualitative Analysis