UNIT 1 Matter Day 4 September 5, 2017 Physical Properties of Matter 8th Grade Science

September 5, 2017 no science starter today. Please do the following: (1) Place your density worksheet in the box on the front lab table. (6th period will have to do it for homework tonight in addition to flash cards). (2) Make sure your name is on flash cards 1-5, they are in order, bound together, and place them in the box, too.

Specific Heat Lab *Hypothesizing- On your “Water and sand specific heat data” sheet, complete the hypothesis by filling in the word “water” or “sand” in the two blanks. *Collecting data *graphing data *analyzing data *drawing a conclusion from the data

On page 7… Write today’s date, 9-5-17, and copy the following: Essential Question: How do physical properties of matter make different substances useful for different things?

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

Homework: Make flash cards for terms 6-9. Study over these flash cards for about 5 minutes tonight.

Turn to your vocab. sheet. You will be using it throughout class today.

Let’s watch a BrainPOP to review mass, volume, and density.

Measurable Properties of Matter A.D. Formula - Density = Mass/Volume m (g) D = ------- V (mL or cm³) A.D. Unit for density is g/mL or g/cm3. A.D. Density of water is 1g/cm³ (anything with a higher density will sink in water; anything with a lower density will float) A.D. fill this in on your notes m D V

Remember 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!

Which has the greater density? Greater density/blue layer

If we didn’t do this Friday, Answer Friday’s E. Q. now If we didn’t do this Friday, Answer Friday’s E.Q. now. Discuss with your group.

Gotta keep moving through physical properties of matter!

Observable Physical Properties 6. Malleability: the ability of a metal substance to be pounded into thin sheets and shaped. A.D. metals are malleable (nonmetals are not)

Examples of: Observable Physical Properties 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) https://www.youtube.com/watch?v=c382ziUpbbc https://www.youtube.com/watch?v=OkuDM3hYutI

MORE Observable Physical Properties 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.

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

MORE Observable Physical Properties 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

Let’s add our specific heat data to our data table, then graph the data on back to see what happened with the sand and water!!!

Water Temperature( ºC) 2nd Period Specific Heat Data Time (minutes) Water Temperature( ºC) Sand Temperature (ºC) Begin 0 minutes 3 6 9 12 15 18 21 24 27 30

Water Temperature( ºC) 5th Period Specific Heat Data Time (minutes) Water Temperature( ºC) Sand Temperature (ºC) Begin 0 minutes 3 6 9 12 15 18 21 24 27 30

Water Temperature( ºC) 6th Period Specific Heat Data Time (minutes) Water Temperature( ºC) Sand Temperature (ºC) Begin 0 minutes 3 6 9 12 15 18 21 24 27 30

Specific Heat Lab Conclusion: _____________ 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).

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

SO WHAT??? WHY does the specific heat of water matter to life on earth????? In what other ways is the high specific heat of water useful?

Engage On the top line of page 6, write “Object Observations Mini-Lab”. Write the name of your group’s item on page 6. 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!

WRAP-UP work with your group to answer today’s e. q WRAP-UP work with your group to answer today’s e.q. use examples in your answer.

Stop here for 9-5-17