Review from last week.

METAL CGroup mass (g) volume (mL) density (g/mL) average

1 36.10 13.90 2.602 35.00 12.90 2.713 35.20 13.30 2.644 34.40 13.10 2.635 32.30 12.40 2.606 37.90 14.00 2.717 32.20 12.00 2.688 38.80 14.20 2.73

Average 35.24 13.23 2.66

Let’s graph the data.

Graph one metal at a time.

Ok Lets figure out the slope. (rise/run) When a sample goes up the y axis what does

it gain? When a sample goes across the x axis what

is it gaining?

Class Data… Lets compare these to the accepted values…

11.50 12.00 12.50 13.00 13.50 14.00 14.5030.00

31.00

32.00

33.00

34.00

35.00

36.00

37.00

38.00

39.00

40.00

f(x) = 2.66513480392157 xR² = 0.999652376514517

Volume VS Mass of Metal C

Volume (mL)

Mass

(g)

METAL CGroup mass (g) volume (mL) density (g/mL) average

1 36.10 13.90 2.602 35.00 12.90 2.713 35.20 13.30 2.644 34.40 13.10 2.635 32.30 12.40 2.606 37.90 14.00 2.717 32.20 12.00 2.688 38.80 14.20 2.73

Average 35.24 13.23 2.66

Mass / Volume?

How does this relate to the slope of my graph?

What is the formula for density?

What is the formula for the slope of a line?

Whhaaat? Density = Slope?

The Highlander Sheet Objective: • Explain density as an intensive property of matter.

• Warm-up: • New and old pennies are made of

different metals. Use your data, draw what each penny would look like at the particle level.

• Cell Phones in backpacks! You know this.

10/5

Make a T chart in your JournalAs you read fill in the chart (5 facts) Fact or idea I read Question I have about the Fact or

idea

When you are finished with the reading answer #2 A-C

Density is the ration of mass to volume (m/v)

Are there other physical properties that we calculate or use a ration to find?

After reading answer these questions in your journal

a. Imagine you are looking at 2 chains that are the same in every respect except that one is made of silver and the other is made of platinum. Which one would have a greater mass? Why?

b. Jewelers measure the mass of gemstones in carats. One carat is equal to 200 milligrams (mg). Which would look bigger, a 1-carat diamond or a 1-carat cubic zirconia? Why?

c. A silver ring has a density of 10.5 g/cm3. A polished aluminum copy looks the same, but a ring with a volume of 2 mL (measured by displacement) has a mass of only 5.4 g. Compare the densities of the metals that make up the 2 rings. Record any calculations you make.

Material

Density (g/cm3)

Silver 10.5Platinum 21.1Diamond 3.5

Cubic Zirconia 5.8

Intensive VS extensive Properties.

Which square is more blue?

Intensive VS extensive Properties.

How about now?

Which penny is more dense? (They are the same year)

Which penny is more dense? (They are the same year)How bout now?

Test Question

What would weigh more, 1 pound of feathers or 1 pound of lead?

The Highlander Sheet Objective: • Explain density as an intensive property of matter.

• Warm-up: • New and old pennies are made of

different metals. Use your data, draw what each penny would look like at the particle level.

• Cell Phones in backpacks! You know this.

10/5

Super student read in best news anchor voice:You have seen in your work with solids and liquids

that, regardless of how much of the material you have, the density of the material remains constant. So, theoretically, if you cut a 1 cm cube in half, then in half again, and keep cutting it repeatedly, each piece would have a smaller size but the same density as the original cube. About 400 BC a Greek scientist and philosopher named Democritus thought about this and what it meant about the fundamental composition of matter. Imagine what would happen if you could go back in history to interview him.

Democritus

Student #1

Student #2

VOCAB at a Glance Density Soluble insoluble Polar Nonpolar Derived quantity Displace (eg finding

volume by displacement)

Intensive property

Extensive property Atoms Elements Compound Molecule Pure substance Mixture Cubic Centimeters

21

WHOT QUESTION: What must be true about the particles that make up matter

to explain macroscopic differences in density? Fill in the pictures below with atoms for each

sample of element. Each sample is 1 cm3

Responsibilities: Vocab Quiz Friday.

SilverDensity 10.5 g/cm3

PlatinumDensity 21.1 g/cm3

Galileo Thermometer1. Draw a sketch of what

you see labeling each important part.

2. Describe the movement you see when heat is applied.

3. Predict what is causing the movement using scientific concepts.

In your notebook:

What scientific concepts did you observe with the candles that may help explain the movement you saw in the Galileo thermometer?

WAIT FOR THE STAMP!

Reflect and Connect

QUIZ (3) AnswerThere are only 2 layers in each bottle

because some of the substances were soluble in (mixed with) each other.

In the Purple bottle, the oil and dye are soluble and less dense than the mix of alcohol and water.

In the RED bottle, alcohol, water, and dye are all soluble and more dense than the oil which floats in a layer on top.

On Target?

Is the density of candle wax the same as the density of water?

How could you find out?

On Target?

Does the DENSITY of a liquid change as the AMOUNT changes?

The Highlander Sheet Objective: • Use properties of metals to identify unknown

metals.

• (remember your science journals should be out.)Speaking of properties of metals…

10/2

They just don’t make them like they used to… Lets identify

the properties of matter.