Alchemy Unit Alchemy Unit Investigation IIInvestigation II

Lesson 1Lesson 1

A New LanguageA New Language

ChemCatalystChemCatalyst

1.1. There are two bottles on a shelf in a There are two bottles on a shelf in a chemistry lab. Both contain a shiny chemistry lab. Both contain a shiny metal substance that resembles metal substance that resembles gold. gold. Bottle A is labeled Au Bottle A is labeled Au (s)(s). Bottle . Bottle B is labeled FeSB is labeled FeS22 (s)(s)..

2.2. Do you think both bottles contain Do you think both bottles contain gold? Why/why not?gold? Why/why not?

3.3. What elements are Au, Fe and S?What elements are Au, Fe and S?

Discussion QuestionsDiscussion Questions

What does the number What does the number 22 in the in the formula FeSformula FeS22 mean? mean?

Why are some letters capitalized and Why are some letters capitalized and some not capitalized?some not capitalized?

Can you define the word Can you define the word elementelement?? How are How are elementselements different from different from

compoundscompounds??

““A New Language” InstructionsA New Language” Instructions

What do the chemical symbols tell us What do the chemical symbols tell us about the substance inside the vial?about the substance inside the vial?– You will make careful observations of You will make careful observations of

the substances in the 17 vials.the substances in the 17 vials.– Then, you will identify an unknown Then, you will identify an unknown

substance in vial 18.substance in vial 18. DO NOT OPEN THE VIALS!!!!DO NOT OPEN THE VIALS!!!!

““Making Sense” DiscussionMaking Sense” Discussion

Chemical formulas tell us which Chemical formulas tell us which elements a substance contains.elements a substance contains.

What symbols are used to label What symbols are used to label something called a:something called a:– SulfateSulfate– NitrateNitrate– HydroxideHydroxide

What symbols represent copper What symbols represent copper sulfate?sulfate?

Making Sense DiscussionMaking Sense Discussion

Is copper sulfate an element or a Is copper sulfate an element or a compound?compound?

What elements are in copper sulfateWhat elements are in copper sulfate What do the subscript numbers What do the subscript numbers

mean?mean?

CuSO4

DefinitionsDefinitions

A A chemical formulachemical formula is the set of is the set of symbols a chemist uses to represent symbols a chemist uses to represent a compound.a compound.

A A compoundcompound is a substance that is a substance that consists of two or more elements consists of two or more elements chemically combinedchemically combined

What About Letters in ( )?What About Letters in ( )?

What do (g), (l) and (s) mean?What do (g), (l) and (s) mean?What is:What is:

– HH22O O (l)(l)

– HH22O O (g)(g)

– HH22O O (s)(s)

What About (aq)?What About (aq)?

What do all the flasks with (aq) on What do all the flasks with (aq) on them have in common?them have in common?

Aq stands for Aq stands for aqueousaqueous a substance a substance is dissolved in wateris dissolved in water– How are NaOH How are NaOH (s)(s) and NaOH and NaOH (aq)(aq) the the

same? How are they different?same? How are they different?

– How are NaOH How are NaOH (aq)(aq) and H and H22O O (l)(l) the same? the same? How are they different?How are they different?

More About Aqueous SolutionsMore About Aqueous Solutions

SoluteSolute: substance dissolved in the : substance dissolved in the waterwater

SolventSolvent: the water: the water So a substance is So a substance is aqueousaqueous if it is if it is

dissolved in waterdissolved in water

Check InCheck In

Imagine that you find a flask Imagine that you find a flask that is labeled Nathat is labeled Na22SOSO44 (aq)(aq)

What does the label tell you What does the label tell you about what is in the flask?about what is in the flask?

You’re Ready for a You’re Ready for a QuizQuiz

Tomorrow!Tomorrow!