Wednesday 1019 Science Warm Ups 1 Please have

Wednesday, 10/19 Science Warm Ups 1. Please have these Items on your desk. Agenda Day 2 Science notebook Fill out your Agenda. Science Starter: 1. What do you know about density? 2. Describe one thing you did over fall break. https: //www. youtube. com/watch? v=Vf. MDC 4 gu. XZg AR Book under desk

Table of Contents Date 10/19 (Red) (purple) (green) Assignment Lab Book Check #2 Density Notes Warm Ups 10/17 -10/21/16 Warm Ups 10/24 -10/28/16 Page pg 37 pg 38 -39 pg 40 pg 41

Density • Density is how much mass something has in a certain volume 100 kg 200 kg How can one have more The Which blueblockhas must have matter if they are the same more a higher matter density! in it? size?

The yellow block has more matter contained in the has same. Which volumeblock as the blue block. the How do. Therefore, you know? higher density? yellow matter must be more dense

If it is the same type of matter, then it has the same density because the matter is Which block has equally crowded. higher density? The size of the piece does not make a difference.

The pink block is smaller, but it still has a Which block is higher density, because the matter is more dense? crowded.

You can use density to predict if an object will float or sink. If something is more dense Will the yellow object than thesink? fluid, float or it will sink

If something is lessbrown denseblock Will the than thesink? fluid, float or it will float

The duck is less dense than water so it floats The anchor is more dense than water so it sinks

How can a balloon float just by filling it with hot air?

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When a fluid gets hot, its density changes! Inside balloon Outside balloon

How can you figure out the density of an object? You need to measure the mass and the volume • The formula for calculating density is: Mass Density = Volume

m v d DMV Triangle: Cover the variable that you need to find, the triangle will tell you what math to do to find it.

Remember how to measure mass? • Mass is a measurement of the amount of matter that something has. • The SI unit for mass is the gram • Mass is measured with a balance Balance

Remember how to measure volume? • Volume is the amount of space that something takes up Volume is measured differently for liquids and solids Volume of Liquids • The SI unit for liquid is liter • Liquid volume is measured with a graduated cylinder

Rectangular Solids Height 3 3 1. 6 cm x 1. 3 cm x 4. 1 cm = 8. 528 8. 5 cm cm Length W id th cm x cm = cm 3

Irregular Solids Displacement method 65 m. L 69 m. L Because the hammer is solid, we use cm 3! Volume of Hammer? 4 m. L or 4 cm 3

Calculating density is simple! 1. 2. 3. Measure the mass Measure the volume Divide Density = Mass (grams) Volume (cm 3) The units that we use for density are grams/cm 3 Say “per”

Density Problems (Use the DMV triangle!) 1. If 52 grams of matter has a volume of 65 cm 3, what is the density of the matter? Will it float or sink in water? 2. If a 32 gram piece of wood has a density of 4 g/cm 3, what is the volume? 3. A metal washer has a mass of 27 g/cm 3 and a volume of 3 cm 3. What is its mass?

4. If an object has a mass of 810 g and a volume of 45 cm 3, what is its density? Will it float or sink in water? 5. When you add a rock to 70 m. L of water in a graduated cylinder, the water rises to 80 m. L. The density of the rock is 4. 2 g/cm 3. What is the rock's mass? 6. What is the volume of a sample of liquid with a density of 20 g/cm 3 and a mass of 25 g? 7. A 540 g fish displaces 90 cm 3 of water. What is the density of the fish?