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Physical Properties & Density. Physical Properties How would you describe someone or something? How would you describe someone or something? weight, height,

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Presentation on theme: "Physical Properties & Density. Physical Properties How would you describe someone or something? How would you describe someone or something? weight, height,"— Presentation transcript:

1 Physical Properties & Density

2 Physical Properties How would you describe someone or something? How would you describe someone or something? weight, height, length, eye color, hair color weight, height, length, eye color, hair color It is easy to identify chemicals, compounds and elements based on their also. It is easy to identify chemicals, compounds and elements based on their physical properties also. EX: color, odor, states of matter to name a few. EX: color, odor, states of matter to name a few.

3 Mass A physical property that every object possesses is mass. A physical property that every object possesses is mass. The amount of mass in a person will never change when the object is moved from place to place. The amount of mass in a person will never change when the object is moved from place to place. Doesnt change with gravity Doesnt change with gravity

4 Weight A physical property that is related to mass is weight. The weight of a dog will change if it is moved to Uranus because weight is determined by gravity.

5 Gravity The greater the mass of an object, the more strongly it attracts other objects. The greater the mass of an object, the more strongly it attracts other objects. The weight of a dog would be heavier on earth than on the moon, because the earths mass is larger than the moons The weight of a dog would be heavier on earth than on the moon, because the earths mass is larger than the moons

6 Physical Changes Some physical changes would be boiling of a liquid boiling of a liquid melting of a solid melting of a solid dissolving a solid in a liquid to give a homogeneous mixture a SOLUTION. dissolving a solid in a liquid to give a homogeneous mixture a SOLUTION. Physical changes do not change the identity of Substances

7 Chemical Change 2 H 2 (g) + O 2 (g) --> 2 H 2 O(g) Click for movie

8 Chemical Change Chemical change or transformation of one or more atoms or molecules into one or more different molecules. Chemical change or chemical reaction transformation of one or more atoms or molecules into one or more different molecules. Burning hydrogen (H 2 ) in oxygen (O 2 ) gives H 2 O.Burning hydrogen (H 2 ) in oxygen (O 2 ) gives H 2 O.

9 Density Another physical property that can be used is density. Another physical property that can be used is density. Density is a measure of the relationship between mass and the volume it occupies. Density is a measure of the relationship between mass and the volume it occupies. Think of it like using weight and height for babies Think of it like using weight and height for babies 95th percentile for height, 30th for weight 95th percentile for height, 30th for weight

10 DENSITY - an important and useful physical property 13.6 g/cm g/cm 3 Aluminum 2.7 g/cm 3 Platinum Mercury

11 Buoyancy and Density One factor that density controls is floating and sinking. One factor that density controls is floating and sinking. Objects float and sink because of their density. Objects float and sink because of their density. The density of water is 1.0 g/mL. The density of water is 1.0 g/mL. The density of cork is 0.34 g/mL. The density of cork is 0.34 g/mL. The density of lead is 13.9 g/mL. The density of lead is 13.9 g/mL.

12 Buoyancy and Density Compounds that are less dense than water float. Compounds that are less dense than water float. Name some other items that will float in water. Name some other items that will float in water. Compounds that are more dense than water sink. Compounds that are more dense than water sink. Name some other items that will sink in water. sink in water.

13 Density Units Density = unit mass per unit volume. Density = unit mass per unit volume. Density = Mass/Volume Density = Mass/Volume Density is recorded as g/mL. Density is recorded as g/mL. Mass is measured in g. Mass is measured in g. Volume is measured in mL. Volume is measured in mL.

14 Density of Some Common Substances SubstanceDensity (g/cm3) SubstanceDensity (g/cm3) Air Air Feathers Feathers Wood(Oak) Wood(Oak) Ice 0.92 Ice 0.92 Water 1.00 Water 1.00 Bricks 1.84 Bricks 1.84 Aluminum 2.70 Aluminum 2.70 Steel 7.80 Steel 7.80 Silver Silver Gold Gold 19.30

15 Density Review

16 Floating Liquids Which diagram represents the liquid layers in the cylinder? (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) 2) 3) K K W W W V V V K

17 Solution (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) K W V

18 Convert volume to mass PROBLEM: Mercury (Hg) has a density of 13.6 g/cm 3. What is the mass of 95 mL of Hg? Note: 1 ml is the same as 1 cm 3

19 Bloody Density Bloody Density If blood has a density of 1.05 g/mL, how many liters of blood are donated if 575 g of blood are given? 1) L 2) 1.25 L 3) 1.83 L Caution: The units are liters!

20 Solution 1) Unit Plan: g mL L 575 g x 1 mL x 1 L = L 1.05 g 1000 mL 1.05 g 1000 mL

21 Light or Heavy Metals You have 3 metal samples. Which one will displace the greatest volume of water? Discuss your choice with another student. 25 g Al 2.70 g/mL 45 g of gold 19.3 g/mL 75 g of Lead 11.3 g/mL

22 Solution 1)25 g Al x 1 mL = 9.2 mL 2.70 g 25 g Al 2.70 g/mL


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