DN: 9/28 Soda Can Demo 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 rubric Leave your CER out to be collected Log into Socrative ( joevchem )

Who Wants To Be A Millionaire?

DN: 9/28 Soda Can Demo RECORD the mass of each can: Mass Diet Coke = ____________ Mass of Coca Cola = ____________ 4.CALCULATE the density of each can: Diet Coke D = = Coca ColaD = =

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 How “compact” are the particles in a substance Can be used as a m  V conversion factor

Analyzing the Density Equation We often compare the density of a substance to the density of water. D of H 2 O ≈ _______ g/mL If density 1 than the object ________. sinks floats If mass increases while keeping V constant Density increases If mass constant While increasing volume Density decreases 1.00

SHOW ALL WORK AND CALCULATIONS WITH UNITS! 1.Aluminum has a density of 2.7 g / cm 3. Use this density as a conversion to determine the mass of a piece of Aluminum that has a volume of 12.4 cm 3. 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 / cm 3. Use this density as a conversion to determine the mass of a sample of Copper that has a volume of 4.0 cm 3. 2.A sample of oil has a mass of g. What is it’s volume? Use the density of liquid ethanol (0.890 g / mL) as a conversion. DN: 9/29 Density Conversions

Measuring 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: Cubes 1.Cube is solid, silver, shiny 2.Mass = 50.3 g 3.…. 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? Leave #7c out to be checked Vote with your phone or iPad at socrative.com, room joevchem

Will it float? SHARE your answer. EXPLAIN your reasoning. CONVINCE your neighbor. 321 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? 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 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 bottom B) It will barely float C) It will float the same as before D) It depends on the size of the holes 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? 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?

a) 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 Ratio 0.8 g/mL D = ? 0.5 g/mL 2. 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 / mL

Sink or float??? …be careful…in water! D= 1.0 g / mL D= 2.3 g / mL D= 1.0 g / mL

Think and see at the particle level! D= 0.5 g / mL D= 1.0 g / mL D= 0.9 g / mL

Think and see at the particle level! 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)

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