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9-23-10 Aim: What is Density?

9-23-10 Aim: What is Density?. Do Now: What is the difference between mass, weight, and volume? HW – R&H pp.5-6, A&E #10-18. 9/27/10 What is a pollutant?. Do Now- 1. What is a natural resource? 2. What is an environmental pollutant? HW- Finish lab, A&E p.12 #29-39.

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9-23-10 Aim: What is Density?

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  1. 9-23-10 Aim: What is Density? Do Now: What is the difference between mass, weight, and volume? HW – R&H pp.5-6, A&E #10-18

  2. 9/27/10What is a pollutant? • Do Now- • 1. What is a natural resource? • 2. What is an environmental pollutant? • HW- Finish lab, A&E p.12 #29-39

  3. Renewable Resource- a resource that regenerates itself in the span of a human life. • Reusable Resource- a resource that can be used over and over again without discarding it. • Recyclable Resource- a resource that can be reformed for an alternative use.

  4. Mass- the amount of matter in an object, cannot change • Weight- the gravitational pull on an object, can change depending on where you are • Volume- the amount of space an object occupies. As temp. increases volume increases and as pressure increases volume decreases

  5. Density- the concentration of matter in an object or how many molecules are squeezed into how much space. Density = Mass/Volume grams/cm3 The density of a substance will always stay the same no matter the size or shape of the substance The only way to change the density of a substance is by applying heat or pressure. However, if you change the density of a substance you have also changed what that substance is.

  6. How to affect Density • Heat- if a substance is heated it makes the molecules move faster causing the substance to expand, therefore, decreasing its density. • Pressure- if pressure is put on a substance the molecules will be forced closer together, therefore increasing its density. • *If you do change the density with heat or pressure than you have also changed what the substance is.

  7. Phases of Matter and Density • Most substances are densest when they are their coolest and in their solid form. • Water is the one exception. It is actually densest as a liquid of 4 deg. Celsius. • All substances will layer out by density with the most dense always going to the bottom and the least dense to the top.

  8. Density and Floatation • Water has a density of 1 g/cm3 at 4 deg.c. • If an object has a density greater than 1 it will sink. • If an object has a density less than 1 it will float. • If an object has a density = 1 it will suspend in the middle of the water.

  9. 9/24/10Aim: How do we calculate Density? • Do Now: • A thumb tack is more dense than the human body, how is this possible? • How can you change mass, volume, density? • Calculate the density of a 3cm cube that weighs 50 grams. HW: Track storms

  10. 9/27/10Aim: What is a pollutant? • Do Now- R&H pp. 11-12. • 1. What is a natural resource? • 2. What is an environmental pollutant? • HW- Finish lab, A&E p.12, #29-39

  11. Renewable Resource- a resource that will regenerate itself in the span of a human life. • Reusable Resource- a resource that can be used multiple times without having to discard it. • Recyclable Resource- a resource that can be reformed for a different use.

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