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PHYSICAL SCIENCE

PHYSICAL SCIENCE

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PHYSICAL SCIENCE

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  1. PHYSICAL SCIENCE Introduction

  2. Physical Science • PHYSICS • Study of matter & energy relationships • CHEMISTRY • Study of matter

  3. MATTER • All matter has volume and mass Amount of space taken up Amount of matter present

  4. VOLUME SOLID -Regularly shaped, use l x w x h - Irregularly shaped, use water displacement • Measuring volume depends on the state of matter • LIQUID • Measure volume in a graduated cylinder • SI unit = liter • Read the bottom of the meniscus Units= cm3 To compare vol, 1ml = 1cm3 GAS - Volume equals the volume of the container

  5. VOLUME • Which is the best device to measure the volume of a liquid? Why?

  6. VOLUME • Practice reading graduated cylinders • The marks, or calibrations, are different numbers on different graduated cylinders • http://jchemed.chem.wisc.edu/JCEsoft/Programs/VideoCD/CPL/Sample/Modules/gradcyl/grad10mL.htm

  7. MASS • To measure the amount of matter present use a BALANCE • Triple beam vs. digital • Tare button- allows measurement of only the contents of a container • Units on balances are grams • Gram is about equal to the mass of a paper clip • SI unit is a kilogram • 1 kg= 2.2 lbs

  8. Changes in Mass? • Can an object change mass? How?

  9. WEIGHT • Related to mass, but differs • It’s a measure of the force of gravity on matter • Gravity is a force of attraction between two objects • All objects in the universe have gravitational forces on other objects • The more matter, the higher the force of gravity So the higher the weight

  10. WEIGHT • Measured using a spring scale • Units are Newtons (N) • Would you have the same weight on the Earth as on other planets? Why? • Would you have the same mass on the Earth as on other planets? Why?

  11. Wrap-up section 1 • Complete “Lab Measurements” • Go over DRW 2-1 • Frayer Model of • Physical properties • Chemical properties • Physical changes • Chemical changes

  12. Frayer Model

  13. Discuss frayer models of • Physical properties • Chemical properties • Physical changes • Chemical changes Chem/Phy Prop • Vol • Flammability • Malleability • Ductile • Do “Mystery Powders” Lab • Introduce DENSITY What do we already know?

  14. Density Which weighs more a pound of feathers or a pound of lead? If the red spheres have the same mass, which cube weighs more? Why? Weight and density are different!!

  15. m D v Computing Density • D=m/v or Cover the variable that you are solving for and the correct formula is revealed!

  16. m D v Computing Density • Units? Sample problems • If the density of Al is 2.70 g/cm3, what mass would 5.0 cm3 have? • What volume would 10.0g of Al occupy? 3. What is the density of a 120.0g block that occupies 6.0cm3?

  17. Density lab Add the information in red to your handout.