Monday Mystery Element Grab 1 calculator for each group! (2 if enough)

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Presentation transcript:

Monday Mystery Element Grab 1 calculator for each group! (2 if enough) Catalyst – November 9+2+4, 2010 Monday Mystery Element Radioactive actinide Named for the Scandinavian god of war Oxide used to make filaments in camping lanterns I hyperlinked the picture of the stopwatch to http://online-stopwatch.com Grab 1 calculator for each group! (2 if enough)

Monday Mystery Element Catalyst – November 9+2+4, 2010 Monday Mystery Element Radioactive actinide Named for the Scandinavian god of war Oxide used to make filaments in camping lanterns I hyperlinked the picture of the stopwatch to http://online-stopwatch.com THORIUM

Unit 6 Test Review Wednesday Today’s Agenda Catalyst Can Crusher Demo! Density Notes Work Time/Mini-Lab Exit Question Unit 6 Test Review Wednesday Unit 6 Test on Thursday

Today’s Objectives SWBAT calculate density of a substance using mass and volume. SWBAT compare the densities of common substances.

Demo Time! CAN CRUSHER!!!!!

What is Density?? Key Point #1: Density is the relationship between mass and volume

Mass is the amount of matter a substance has Don’t Forget! Mass is the amount of matter a substance has Unit: grams Volume is the amount of space an object takes up Unit: mL or cm3

Boxes of Matter 1 2 Which box has the larger volume? Which box has the larger mass? Which box is more dense? 1 2

MUSCLE vs. FAT

How to Calculate Density?? Key Point #2: If you know the mass and volume of a substance, you can use the following formula to calculate density….

So what are the units for density (D)? Density Formula Work So what are the units for density (D)? g/cm3 OR g/mL

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

What if we already know density? How to find mass (M)? How to find volume (V)? M = D x V M V = D

Density Formula Practice 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? The mass of a Hershey’s bar is 43 g. The density of the Hershey’s bar is 1.72 g/mL. What is the volume?

Class Work Time You have 15 minutes to complete the worksheet – then we will go over the questions 1-6 We will go over the answers in 10-15 minutes, then do a mini-lab Ask questions now if you have them! Finish the worksheet for homework

Mini-Lab Demo: Density of aluminum Each group will collect data (mass) to calculate the densities of different common substances We will then share our results

Data Table Material Volume (cm3) Mass (g) Density (g/cm3) Aluminum Steel (Black) Copper Brass Oak Pine Poplar Nylon (White) Acrylic (Clear) PVC (Gray)

Data Material Volume (cm3) Mass (g) Density (g/cm3) Aluminum Steel (Black) Copper Brass Oak Pine Poplar Nylon (White) Acrylic (Clear) PVC (Gray) 15.625 15.625 15.625 15.625 15.625 15.625 15.625 15.625 15.625 15.625

Exit Question What is the mass of an object with a volume of 3.2 cm3 and a density of 2.0 g/cm3? (Hint: figure out what formula to use first!) HOMEWORK: Finish Density Worksheet Work on Review Sheet, Test Thursday! “Prejudices, it is well known, are most difficult to eradicate from the heart whose soil has never been loosened or fertilized by education; they grow there, firm as weeds among rocks.”