UNIT 1 M ATTER D AY 4 S EPTEMBER 6, 2016 Physical Properties of Matter 8 th Grade Science

S EPTEMBER 6, 2016 NO SCIENCE STARTER TODAY. Please let me know if your lab group did not finish the density lab Friday. (1) Place your density worksheet in the box on the front lab table. (2) Make sure your name is on flash cards 2-5 and place them in the box, too.

*H YPOTHESIZING - O N YOUR “W ATER AND SAND SPECIFIC HEAT DATA ” SHEET, COMPLETE THE HYPOTHESIS BY FILLING IN THE WORD “ WATER ” OR “ SAND ” IN THE TWO BLANKS. *C OLLECTING DATA * GRAPHING DATA * ANALYZING DATA * DRAWING A CONCLUSION FROM THE DATA Specific Heat Lab

On page 5… Write today’s date, , and copy the following: Essential Question: How do physical properties of matter make different substances useful for different things?

M ATTER Plan for today: 1. E. Q. 2. Finish density review 3. More physical properties of matter: -Group activity -Discussion -Notes 4. Wrap-up

Homework: 1.Make flash cards for terms Study over these flash cards for about 5 minutes tonight.

L ET ’ S TALK ABOUT FLASH CARDS.

Let’s do some catch-up and review from Friday. Write Friday’s date, , on the top line of page 3 in your binder and copy the following: Essential Question- How can I calculate density of objects?

T URN TO YOUR YELLOW VOCAB. S HEET. Y OU WILL BE USING IT THROUGHOUT CLASS TODAY.

M EASURABLE P ROPERTIES OF M ATTER 5. Density: Def: the amount of matter in a given amount of space or volume. A.D. all matter has its own unique density

M EASURABLE P ROPERTIES OF M ATTER A.D. Formula - Density = Mass/Volume m (g) D = V (mL or cm³) A.D. Unit for density is g/mL or g/cm 3. A.D. Density of water is 1g/cm³ (anything with a higher density will sink in water; anything with a lower density will float) D m V A.D. fill this in on your notes

R EMEMBER THIS : It does NOT matter how much you have of a substance; its density will always be the same. Ex. Water has a density of 1 g/cm³. If you have a teaspoon of water, its density will still be 1 g/cm³. If you have a liter of water, its density will still be 1 g/cm³. Every pure substance has its own UNIQUE density that does not change even if the amount of it changes!

W HICH HAS THE GREATER DENSITY ? Greater density Greater density/blue layer Greater density

Practice – Answer on page 6. Only use 6 lines. -5 minutes. Go! Calculate the density for the following objects: a. Mass= 10 Volume= 5 b. Mass= 16 Volume= 8 c. Mass= 5 Volume= 10 d. Mass= 12 Volume= 12 Which object is water? Which object(s) will float in water? Which objects(s) will sink in water? 2g/cm³ 2g/cm 3 0.5g/cm 3 sinker floater water 1 g/cm³

D ENSITY L AB P ART 2– REGULAR S OLID MaterialDensity (g/cm3) Copper9.3 Brass8.7 Steel7.6 Aluminum2.8 Acrylic1.2 Oak Nylon1.15 Pine Poplar PVC1.35

D ENSITY L AB SHOULD BE ON PAGE 4.

A NSWER F RIDAY ’ S E.Q. NOW. D ISCUSS WITH YOUR GROUP.

Gotta keep moving through physical properties of matter!

E NGAGE On the top line of page 6, write “Object Observations Mini-Lab”. Write the name of your group’s item on page 4. Observe the item and work with your group to come up with as many characteristics and uses for your object as you can think of. Record your observations on page 6. Be realistic! (ex: the cup isn’t going to be a hat) You have 3 minutes….Go!

O BSERVABLE P HYSICAL P ROPERTIES 6. Malleability : the ability of a metal substance to be pounded into thin sheets and shaped. A.D. metals are malleable (nonmetals are not)

E XAMPLES OF : O BSERVABLE P HYSICAL P ROPERTIES 7. Ductility: the ability of a substance to be drawn or pulled into a wire. A.D. Metals usually are ductile.(ex. copper wiring for electrical wiring in homes)

MORE O BSERVABLE P HYSICAL P ROPERTIES 8. Conductivity of heat or electricity : (more on the next slide) The ability for heat and/or electricity to pass through an object easily. A.D. Metals are usually the best conductors of heat and electricity. (Don’t copy.) Little known fact: This is how vending machines recognize coins. Different coins are made of different metals which have different levels of conductivity.

C ONDUCTIVITY ( CONT.) A.D. Insulator of electricity or heat: when an object passes heat and electricity poorly. A.D. Nonmetals are usually good insulators.

MORE O BSERVABLE P HYSICAL P ROPERTIES 9. Magnetism: a force of attraction between ions (charged particles) A.D. Iron is magnetic. Ex. Useful for refrigerator doors, alarm systems, and hand tools

10. Specific heat - How much energy it takes to increase the temperature of a substance 1ºC A.D. A high specific heat means it takes a LOT of energy/heat to change the temperature of the substance. A.D. Water has a high specific heat. Metals have low specific heat. High specific heat Low specific heat

L ET ’ S GRAPH OUR SPECIFIC HEAT DATA AND SEE WHAT HAPPENED WITH THE SAND AND WATER !!!

Time (minutes)Water Temperature( ºC) Sand Temperature (ºC) Begin 0 minutes rd Period Specific Heat Data

Time (minutes)Water Temperature( ºC) Sand Temperature (ºC) Begin 0 minutes th Period Specific Heat Data

Specific Heat Lab C ONCLUSION : _____________ HAD A HIGHER SPECIFIC HEAT THAN _______________ BECAUSE IT HEATED UP MORE SLOWLY ( TOOK LONGER TO ABSORB ENERGY - HEAT ) AND COOLED DOWN MORE SLOWLY ( WAS SLOWER TO RELEASE ENERGY - HEAT ).

Discuss Specific Heat Data and add to our data table. We’ll learn more about specific heat tomorrow.

WRAP-UP WORK WITH YOUR GROUP TO ANSWER TODAY ’ S E. Q. USE EXAMPLES IN YOUR ANSWER.

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