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

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Presentation transcript:

Density Notes Test – Thursday, 11/7 Textbook & Online Resources: Chapter 8 – Lesson 1: Measuring Matter

Mass The amount of matter in an object.

Mass Mass is measured in grams or kilograms. The tools that you use for measuring mass are a triple-beam balance or a scale.

Weight The force of gravity pulling down on an object.

On planet earth, an object’s weight is the same as its mass. Weight = 6,000 kg Mass = 6,000 kg

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

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

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

Volume of a box Length X width X height = volume 4 cm 3 cm 8 cm 8cm X 3cm X 4cm = 96 cubic centimeters

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

Measure the water level with and without the dinosaur ***Difference in volumes = volume of the object!

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

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

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

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

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

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

The Density Formula Density Volume Mass X

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

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

If the object has a mass of 40 g and a density of 8 g/cm3, what’s the volume? 40g 8 g/cm3 = 5 cm3 M = 40 D = 8 V= ???? X

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

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

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

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

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.

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

Density Gizmo – predict float or sink

A small object can have high density. Ex: a coin is heavy for its size and will sink in water.

A small object can have low density. Ex: a balloon is light for its size and will float in water or air.

A large object can have high density. Ex: a boulder is very heavy for its size and will sink in water.

A large object can have low density. Ex: an elephant is less heavy for its size and will float in water.

***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

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

Will it float? Mass = 270 g Volume = 317 cm3 270g / 317 cm3 = 0.85 g/cm3

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

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

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

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.