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Do Now for 10/3/13 Take out A9 Lab Report HW: Complete Procedure Part C Benchmark Assessment about density on Tomorrow

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A9 Measuring mass, calculating density Today’s Target: I will be able to accurately calculate the density of the six objects at my station.density Review lab procedures Review lab safety Gather data Part C – Complete for homework

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A9 Measuring mass, calculating density Density – The amount of mass (stuff) in a given unit of volume. The amount of stuff packed into a given unit of space. We’re going to measure the densities of our various objects. Open books to activity A9 beginning on page A-36.

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A9 Measuring mass, calculating density Lab safety – Wash hands when finished gathering data. Equation for finding density: – Density = mass/volume -OR- D = m/v – Units for density: grams per cubic centimeter g/cm 3 Where can you find information about the volume of the objects? – Student sheet 8.1b Make sure you complete both tables. Use of the balance. Use of the balance

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A9 Measuring Mass, Calculating Density ObjectMass (g)Volume (cm 3 or mL) Density Calculation Density (g/cm 3 or g/mL) Light gray bar Dark gray bar Light gray cube Dark gray cube Light gray cylinder Dark gray cylinder

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A9 Identifying Objects’ Material Using Density ObjectDensity Calculated Closest Density from Table 3 Object’s Material Light gray bar Dark gray bar Light gray cube Dark gray cube Light gray cylinder Dark gray cylinder

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A9 Measuring mass, calculating density ObjectMass (g)Volume (cm 3 or mL) Density Calculation Density (g/cm 3 or g/mL) Light gray bar21.97.221.9/7.2=3.0 Dark gray bar62.47.262.4/7.2=8.6 Light gray cube45.115.645.1/15.6=2.9 g/cm 3 Dark gray cube128.215.6128.2/15.6=8.2 g/cm 3 Light gray cylinder 16.45.716.4/5.7=2.9 Dark gray cylinder 50.55.750.5/5.7=8.9 From Student sheet 8.1b

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A9 Measuring mass, calculating density ObjectDensity Calculated g/cm 3 or g/mL Closest density from Table 3 Object’s material Light gray bar3.0 Dark gray bar8.6 Light gray cube2.9 Dark gray cube8.2 Light gray cylinder2.9 Dark gray cylinder8.9

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A9 Measuring mass, calculating density ObjectDensity Calculated g/cm 3 or g/mL Closest density from Table 3 Object’s material Light gray bar3.02.7Aluminum Dark gray bar8.67.9Iron Light gray cube2.92.7Aluminum Dark gray cube8.27.9Iron Light gray cylinder2.92.7Aluminum Dark gray cylinder8.97.9Iron

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A9 Measuring mass, calculating density Do Now for 10/8/13 – Take out A9 write up. – HW: Study for density quiz Thursday – Bring a calculator Further developed answer to 3E due Thursday

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A9 Measuring mass, calculating density Today’s Target: I will Learn how to calculate density and see how it can be used to identify different substances. Check HW – Check HW Yesterday’s Exit Ticket questions Discuss Data Go over analysis questions Key Points Vocabulary

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A9 Measuring mass, calculating density Important to Note: There is a degree of uncertainty in using density to identify unknown solids. Most metals have impurities or are alloys (mixtures of metals) and therefore can have a whole range of densities.

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A9 Measuring mass, calculating density Analysis 1. What material is each metallic solid made of? Use data from this activity to support your explanation.

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2. Now that you have identified what each solid is made of, look at the hazards for each in Table 2 in Activity 7 (page A-31). What safety precautions must be taken when working with these materials? – Iron – – Aluminum -

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A9 Measuring mass, calculating density 3. A block of wood is 4 cm wide, 5 cm long, and 10 cm high. It’s mass is 100 grams. – A. Calculate its volume – B. Calculate its density – C. Will the wood float or sink in water? Explain.

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– D. Imagine cutting the block into two exactly equal halves. Calculate the volume, mass and density of each piece. 4 cm 5 cm 10 cm 100 g 5 cm 4 cm 5 cm Mass?

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A9 Measuring mass, calculating density Develop an answer to letter E to hand in on Thursday. MAKE SURE YOU INCLUDE A DIAGRAM.

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Exit Ticket Take out a 3x5 card and write: Your name, date, and period in the upper right hand corner. Answer the following question: – Why were the density numbers we calculated so far off from the actual densities of our objects?

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WATCH THE FOLLOWING You-tube clips to learn more about density!! Cool density experiment you can try at home!! – http://link.brightcove.com/services/player/bcpid34762914001?bctid=70873260001 http://link.brightcove.com/services/player/bcpid34762914001?bctid=70873260001 What if you are trying to find the density of an “irregular” object ? – http://www.youtube.com/watch?v=- f5FBvtJ7T0&feature=related&safety_mode=true&persist_safety_mode=1 http://www.youtube.com/watch?v=- f5FBvtJ7T0&feature=related&safety_mode=true&persist_safety_mode=1 One more cool experiment! – http://link.brightcove.com/services/player/bcpid34762914001?bctid=84449964001 http://link.brightcove.com/services/player/bcpid34762914001?bctid=84449964001 Student designed experiment!! – http://www.youtube.com/watch?v=fqLCwuKMBMA&safety_mode=true&persist_safety_m ode=1 http://www.youtube.com/watch?v=fqLCwuKMBMA&safety_mode=true&persist_safety_m ode=1

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Key Concepts: 1. Substances have characteristic properties, such as density, that are independent of the amount of the sample. Ex. 2. Measurements and mathematics are important in all aspects of scientific inquiry. – Ex.

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A9 Measuring mass, calculating density Vocabulary – Density- A7 – qualitative A8 – quantitativeA8 – volume A8 – 1. Mass: The amount of matter in an object. – 2. Weight: The vertical force exerted by a mass as a result of gravity.

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Do Now for 10/11/12 Review for Quiz HW: #3E from Activity A9 is due tomorrow. Make sure it’s on a separate sheet of paper. Read and write up A10

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A10 Density of Unknown Solids Create a procedure to find the density of unknown solids from our original mixture. You should have: – Materials list – Safety precautions – DETAILED procedure steps – Data table Consider: – Which equipment and procedures will give you the most accurate measurements – Record your measurements for length to the nearest 0.1 cm. If you are measuring volume in mL, round to the nearest mL. – Be specific!!!

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