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Published byWendy Boyd Modified over 5 years ago

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**Density Notes Test – Thursday, 11/7 Textbook & Online Resources:**

Chapter 8 – Lesson 1: Measuring Matter

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Mass The amount of matter in an object.

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**Mass Mass is measured in grams or kilograms.**

The tools that you use for measuring mass are a triple-beam balance or a scale.

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Weight The force of gravity pulling down on an object.

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**On planet earth, an object’s weight is the same as its mass.**

Weight = 6,000 kg Mass = 6,000 kg

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**Ex: weight would change in space or on another planet**

Earth = Weight = 6,000 Kg However, an object’s weight can change, depending on the amount of gravity. Ex: weight would change in space or on another planet *Empty Space* Weight = 2,262 Kg Weight = 14,184 Kg Weight = 0 Kg

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Volume The amount of space that is taken up by an object.

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Volume Volume is measured in cubic centimeters (cm3) or cubic meters (m3) Volume of liquids is measured in milliliters (ml) or Liters (L)

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**Volume of a box Length X width X height = volume**

4 cm 3 cm 8 cm 8cm X 3cm X 4cm = 96 cubic centimeters

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Water Displacement Used to find the volume of an irregular solid….like this toy dinosaur

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**Measure the water level with and without the dinosaur**

***Difference in volumes = volume of the object!

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**water level with object – water level without object = volume of object**

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**77 – 47 = 30 cm3 Graduated Cylinder with out marbles**

10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 Graduated Cylinder with out marbles Cylinder with marbles 77 – 47 = 30 cm3

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Density The formula for density is D=m/v OR Density = mass volume

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**Don’t forget the formula for density, or you will break Mrs**

Don’t forget the formula for density, or you will break Mrs. Szerdy’s heart! M V

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**If the object has a mass of 74 grams, and a volume of 8 cm3 What is the density?**

74g/8 cm3 = 9.25 g/cm3

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**2. If the object has a mass of 10 grams, and a volume of 20 cm3 What is the density?**

10g/20 cm3 = 0.5 g/cm3

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The Density Formula Density Volume Mass X

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**If the object has a mass of 40 grams, and a volume of 5 cm3 What is the density?**

40g/5 cm3 = 8 g/ cm3 M = 40 D = ???? V = 5 X

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**If the object has a density of 8 g/cm3 and a volume of 5 cm3, What is the mass???**

8g/cm3 X 5 cm3 = 40 g M = ???? D = 8 X V = 5

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**If the object has a mass of 40 g and a density of 8 g/cm3, what’s the volume?**

40g g/cm3 = 5 cm3 M = 40 D = 8 V= ???? X

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**3. If the object has a density of 2 g/cm3 and a volume of 10 cm3, What is the mass?**

2 g/cm3 x 10 cm3 = 20 g

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**4. If the object has a density of 0**

4. If the object has a density of 0.5 g/cm3 and a volume of 25 cm3, What is the mass? 0.5 g/cm3 x 25 cm3 = 12.5 g

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**5. If the object has a mass of 60 g and a density of 3 g/cm3, what’s the volume?**

60g / 3 g/cm3 = 20 cm3

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**6. If the object has a mass of 150 g and a density of 5 g/cm3, what’s the volume?**

150g / 5g/cm3 = 30 cm3

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**Density is measured in grams per cubic centimeter = g/cm3**

If something has a density of 10 g/cm3, that means that 1 cm3 of the substance would weigh 10 grams.

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**Density is how heavy something is in relationship to its size.**

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**Density Gizmo – predict float or sink**

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**A small object can have high density.**

Ex: a coin is heavy for its size and will sink in water.

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**A small object can have low density.**

Ex: a balloon is light for its size and will float in water or air.

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**A large object can have high density.**

Ex: a boulder is very heavy for its size and will sink in water.

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**A large object can have low density.**

Ex: an elephant is less heavy for its size and will float in water.

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*****The density of water = 1*****

Objects with a density of less than 1 float in water ***The density of water = 1*** Objects with a density of more than 1 sink in water

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Will it float? Mass = 52 g Volume = 35 cm3 52g / 35 cm3 = 1.48 g/cm3

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**Will it float? Mass = 270 g Volume = 317 cm3**

270g / 317 cm3 = 0.85 g/cm3

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Will it float? Mass = 4 g Volume = 10 cm3 4g / 10 cm3 = 0.4 g/cm3

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**A material’s density can be used to identify it. **

The density of gold is 19.3 g/cm3 Which of the following substances is gold? Rock A Mass = 108 g Volume = 12 cm3 Rock B Mass = 126 g Volume = 15 cm3 Rock C Mass = 386 g Volume = 20 cm3 108g / 12 cm3 = 9 g/cm3 126g / 15 cm3 = 8.4 g/cm3 386g / 20 cm3 = 19.3 g/cm3

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**Find the density of these 3 pieces of gold**

Small Piece of Gold Mass = 386 g Volume = 20 cm3 Medium Piece of Gold Mass = 1158 g Volume = 60 cm3 Large Piece of Gold Mass = 5018 g Volume = 260 cm3 386g / 20 cm3 = 19.3 g/cm3 1158g / 60 cm3 = 19.3 g/cm3 5018g / 260 cm3 = 19.3 g/cm3

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**A material’s density is always the same**

A material’s density is always the same! It does NOT change with its size. All samples of gold have the same density!!! It does not matter how large the piece is.

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