Do Now - February [3(6) - 4 2 ], 2009 1.How does mass relate to the law of conservation of matter before and after a physical or chemical change? 2.How.

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Presentation transcript:

Do Now - February [3(6) ], How does mass relate to the law of conservation of matter before and after a physical or chemical change? 2.How do we talk about the “heaviness” of a liquid?

Agenda Do Now/Announcements Review It’s Demo Time! Day of Density! Class Work Time Pass out textbooks Exit Ticket

Review Matter Mass Volume Physical and Chemical Change Law of Conservation of Matter

Matter Matter is anything that has mass and takes up space. Matter is the “stuff” that makes up our world.

Mass and Volume Mass is the amount of “stuff” or matter in an object Volume is the amount of space and object takes up SOLID –Regular shape V = L x W x H (cm 3 ) –Irregular shape Displacement Method (mL) LIQUID – Graduated cylinder (mL) GAS – PV = nRT

Physical and Chemical Change Physical change - a type of change that alters the physical properties bt does not change the composition of the substance Chemical change - the ability of a substance to change into one or more new substances

Law of Conservation of Matter The law of conservation of matter states that matter cannot be created or destroyed during a physical or chemical change How did we see or prove this very important scientific law ? Steel Wool Investigation Lab on Friday Experimental Error

Objectives SWBAT relate mass and volume to density. SWBAT calculate mass, volume, and density using the density formula.

It’s Demo Time! 1 can Coke 1 can Diet Coke Tub of water Nutritional Information Example Samples

It’s Demo Time! ___________ sugar in Coca-Cola Classic ___________ NutraSweet in Diet Coke 39 g 180 mg How can we compare these units? DIMENSIONALANALYSIS

What about other kinds of Coke? 39 g sugar 0.18 g NutraSweet 39 g sugar 42 g sugar g Nutra Sweet and acesulfame potassium (ace-k) Nutritional Info Nutritional Info

MUSCLE MUSCLE vs. FAT

So…What is Density? Density is the relationship between mass and volume. The formula for density is… Add this to your Vocabulary Log!

Let’s Talk About… To talk about the density of an object, we must understand mass and volume very well. Let’s look at some different objects… Mass and Volume

Density Formula What is the unit for mass? Grams (g) What are the different units for volume? Regular Solids: cm 3 Irregular Solids and Liquids: mL So what is the unit for density? g/cm 3 OR g/mL

Back to Coke! Mass Classic = x + 39 gMass Diet = x g Volume Classic = 355 mL Volume Diet = 355 mL

Density Formula Work 1.The mass of a can of air freshener is 112 g. The volume of the can is 118 mL. What is the density? 2.The mass of a bottle of Shout Ultra Gel is 246 g. The volume of the bottle is 200 mL. What is the density?

Density Formula Work How to find D? How to find M? How to find V? M = D x V V = M D

Density Formula Work 1.The density of a Kit-Kat bar is 0.93 g/mL. The volume of the Kit-Kat is 10 mL. What is the mass? 2.The mass of a bottle of a Hershey’s bar is 43 g. The density of the Hershey’s bar is 1.72 g/mL. What is the volume? 3.Which candy bar will float in water? Why?

Class Work Time Please work on the worksheet. I will pass out your textbooks, so listen for your name. If you do not finish, you will need to finish this for homework. Don’t forget to start working on your reading and question packet for the week!

Exit Ticket 1.What is the definition of density ? 2.What is the formula for density ? 3.Two objects have the same mass. Object 1 has a smaller volume than Object 2. Which object has the greatest density ?