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**What do you notice in this picture?**

Why do you think this man is floating so high in the water?

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**Physical Properties of Matter**

Today’s FOCUS Density Conductivity Magnetism Melting Point/Boiling Point Solubility

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**Calculate/determine the densities of various materials. **

By the end of class, we will be able to… Calculate/determine the densities of various materials. Analyze the densities of various materials using data. Explain that these properties are independent of the amount of the sample.

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What is density? Density is a physical property of matter that relates to both mass and volume. how much mass (stuff) is packed into a certain volume (space). Density is not dependent on the amount of the sample. Density is the amount of mass per given volume so it is measured in g/mL or g/cm3. The formula for density is mass ÷ volume. Note to self: Density of Water is 1g/mL

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**Which one is more dense? Demonstration: People in a square**

How about this: Which square has the most people packed into it? Keep in mind that both squares are the same size. So they can both hold the same amount of people. Have a group of 3 students demonstrate people in a square. Then have them explain the difference between the two squares that they occupy in the room. The teacher can tell them were to position themselves if students need direction. Probe the class by asking: what's the difference between these squares? Ask which square has the most people? Explain that both squares are the same size. Then have students look at the PowerPoint slide.

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Which one is more dense? Compare this slide to the last one. What’s the difference between the squares? These two squares have the same amount of people with a different amount of volume (space). Have students compare and contrast these squares. Have them tell you which square is the most dense and why?

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Density at a glance… On the left side of your journals, list the liquids from most dense to the least dense. Explain why in at least one complete sentence.

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Understand that… Objects that are less dense than the liquid they are in float. Objects that are more dense than the liquid they are in sink. Ask the students to look at the picture and explain why the cans are behaving the way that they are.

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**What can you say about the liquid in this picture compared to the man?**

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**Which of these substances will float or sink in water?**

Density (g/mL) Platinum 21.4 Aluminum 2.7 Air Gasoline 0.70 Silver 10.5 Olive oil 0.89 Ice (0 oC) 0.92 Iron 7.8 Nickel 8.8 Gold 19.3

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**A closer look at density**

Density = mass OR mass ÷ volume. volume Units for density: g or g cm mL Why are these the units for density? ALWAYS REMEMBER UNITS!

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**How do we find mass? Mass is the amount of matter in an object.**

mass is measured in grams (g), kilogram (kg) Mass can be found using lab equipment: Digital Scale Triple beam balance Triple Beam Balance Digital Scale

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**How do we find volume? Volume is the amount of space taken up.**

Volume is measured in milliliters (mL), cubic centimeters (cm3) Volume can be found using Metric ruler Graduated cylinder

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**When measuring volume…**

Regular objects (cubes, rectangles), a metric ruler can be used to measure L x W x H Irregular objects (rocks, marbles, etc), a graduated cylinder is used to measure the amount of water that is displaced. Final water level Initial water level Determine the volume of the pebbles in the picture.

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**Whole Group Exploration (GIZMOs): Density Laboratory (Right Side)**

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**Whole Group Exploration (GIZMOs): Density Laboratory (Right Side)**

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Left Side While students answer the questions, give them about 1 minute per question. Then do a Think-Pair-Share activity with the completion of each question.

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**Remember! Density = mass OR mass ÷ volume. volume**

Units for density: g or g cm mL ALWAYS REMEMBER UNITS!

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**Calculate the Density of each object in the last column (Right Side)**

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Left Side While students answer the questions, give them about 1 minute per question. Then do a Think-Pair-Share activity with the completion of each question.

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**Let’s try a density problem together**

Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? Frank also has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density?

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**Does density depend on the amount of a sample? Let’s explore…**

What’s the difference between the substance you see in the pictures? On the left side of your journal: 1-Describe how the substance is behaving in all the pictures. 2-Estimate how much of the substance you see in all of the pictures. 3-Does the amount change how the substance behaves? 4-What do all pictures have in common no matter what? Keep behavior of the substance in mind when answering…

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