DN: 9/28 Soda Can DemoDN: 9/28 Soda Can Demo

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BE READY FOR THE SODA CAN DEMONSTRATION.

1. Make a PREDICTION: What will happen when the two cans of soda into water?

2. Turn & Talk – DISCUSS: What happened and why do you think it happened?

Score yourself on the CER rubricLeave your CER out to be collectedLog into Socrative ( joevchem )

Who Wants To Be A Millionaire?

Who Wants To Be A Millionaire?

DN: 9/28 Soda Can DemoDN: 9/28 Soda Can Demo

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3. RECORD the mass of each can:

Mass Diet Coke = ____________

Mass of Coca Cola = ____________

4. CALCULATE the density of each can:

Diet Coke D = = ------------

Coca Cola D = = ------------

V

m

V

m

Densityvs.“Heavy or Light” Densityvs.“Heavy or Light”

The Meaning of Density

Only compares one mass to another mass

Measured in grams

How the weight of all the particles in a substance “feels”

Compares mass to volume

A relationship between variables is called a ratio

D = , measured in V

mmL

gor

cm

g3

How “compact” are the particles in a substance

Can be used as a m V conversion factor

Analyzing the Density Equation

V

mD

We often compare the density of a substance to the density

of water. D of H2O ≈ _______ g/mL

If density 1 than the object ________.

If density 1 than the object ________.

sinks

floats

If mass increases while

keeping V constant

Density increases

V

mD If mass constant

While increasing volumeDensity

decreases

1.00

SHOW ALL WORK AND CALCULATIONS WITH UNITS!

1. Aluminum has a density of 2.7 g / cm3. Use this density as a conversion to determine the mass of a piece of Aluminum that has a volume of 12.4 cm3.

2. Find the volume of liquid Ethanol that has a mass of 125 g. Use the density of liquid ethanol (0.79 g / mL) as a conversion.

Density Calculations

The Density Column

Leave HW #7c out to be checked.Complete the two calculations below in your notebook.SHOW ALL WORK AND CALCULATIONS WITH UNITS!

1. Copper has a density of 8.96 g / cm3. Use this density as a conversion to determine the mass of a sample of Copper that has a volume of 4.0 cm3.

2. A sample of oil has a mass of 103.7 g. What is it’s volume? Use the density of liquid ethanol (0.890 g / mL) as a conversion.

DN: 9/29 Density ConversionsDN: 9/29 Density Conversions

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Measuring Volume by DisplacementMeasuring Volume by Displacement

Original Volume is

180 mL

Final Volume is

260 mL

The object has displaced 260 mL – 180 mL = 80 mL

So, the volume of the object is 80 mL.

PROCEDURE Manager:

LAB MANAGER ASSIGNMENTS

DATA Manager:

MATERIALS Manager:

DENSITY STATIONS ACTIVITY

PROCEDURE: constantly pre-reading and re-reading the procedure

LAB MANAGER ASSIGNMENTS

DATA: makes sure all lab partners are recording ALL information as you go

MATERIALS: keeps materials and bins clean and organized before and after each activity

ACTIVITY #1: Cubes1. Cube is solid, silver,

shiny2. Mass = 50.3 g3. ….4. ….

How to record information

A) It will sink to the bottom

B) It will barely float

C) It will float the same as before

D) It depends on the size of the holes

A student places a flat block of wood into water and sees that it floats. Then the student drills holes all the way through the wood. Which of the following will happen when the block of wood with holes is placed back into water?

DN: 10/1 Does it float?DN: 10/1 Does it float?

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Leave #7c out to be checkedVote with your phone or iPad at socrative.com, room joevchem

Will it float?Will it float?

SHARE your answer.SHARE your answer.EXPLAIN your reasoning.EXPLAIN your reasoning.CONVINCE your neighbor.CONVINCE your neighbor.

3 2 1

A) It will sink to the bottom

B) It will barely float

C) It will float the same as before

D) It depends on the size of the holes

10/1 Does Density Change?10/1 Does Density Change?

If you cut an object exactly in half, what would happen to the density of each piece?

A) The density would double

B) The density would be half

C) The density would stay the same

D) It would depend on the material

Density as a RatioDensity as a Ratio

If you cut an object exactly in half, what would happen to the density of each piece?

A) The density would double

B) The density would be half

C) The density would stay the same

D) It would depend on the material

A) It will sink to the bottomB) It will barely floatC) It will float the same as beforeD) It depends on the size of the holes

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Which do you most agree with and why? Explain your thinking using at least these words:mass, volume, density, and ratio

DN: 9/29 Does it float?DN: 9/29 Does it float?

A student places a flat block of wood into water and sees that it floats. Then the student drills holes all the way through the wood. Which of the following will happen when the block of wood with holes is placed back into water?

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1a) A student has a 80 g of a liquid that has a volume of 100 mL. Calculate the density.

1b) Another student has ¼ the amount of the same liquid. Show mathematically that the ratio of mass to volume, in other words the density, stays the same.

DN: 9/30 Density as a RatioDN: 9/30 Density as a Ratio

0.8 g/mL

D = ?

0.5 g/mL2. The brown block of wood, with a density of 0.5 g/mL, is floating at the top of a blue liquid. The liquid has a density of 0.8 g/mL. The red object is suspended – floating in the middle – of the liquid. What is the density of the red object?

Sink or float??? …be careful…in water!

D= 0.5 g / mL

D= 0.9 g / mL

D= 1.0 g / mLD= 1.0 g / mL

Sink or float??? …be careful…in water!

D= 1.0 g / mL

D= 2.3 g / mLD= 1.0 g / mL

D= 1.0 g / mL

D= 1.0 g / mL

Think and see at the particle level!

D= 0.5 g / mL

D= 1.0 g / mLD= 1.0 g / mL

D= 0.9 g / mL

Think and see at the particle level!

D= 1.0 g / mL

D= 1.0 g / mL

D= 1.0 g / mL

D= 2.3 g / mL

In-Text Citations

( Flinn, 2009)

( Author, Year )

( Author and Author, Year)

( Author et al, Year)

The evidence was successfully analyzed using the…

WHAT

HOW

RESULT ... .( Author(s) , year )