Wednesday September 10, 2014

Density

LT: I can find the densities of different solids and liquids, in order to determine how to separate a mixture

Warm up: 1.     what is density? 2.     How can knowing density help separate a mixture?? Q: How can understanding density help us separate our oil spill mixtures? Power pt & notes                             Hand out notecatchers Lab Sheets Review how to find density for solids and liquids Show YouTube Video https://www.youtube.com/watch?v=SimFy9wOMXY *Model finding density -----------------                           Q: What do you think it means if an object has a density less than 1.0, more than 1.0?      more than 1 = sink      less than 1 = float    Density Lab: Steps 1 & 2 When you’re done with Step 1: come see me, and I’ll give you step 2  Debrief                                   Q: What is density and how do you find it? Exit Ticket                           How can knowing what density is, help you to separate a mixture?    Density Note Taking Guide LT: I can find the densities of different liquids and solids, in order to determine how to separate a mixture. Density is a comparison of how much matter there is in a certain __________________________________ Which is more dense? Circle it. Why did you choose that one? __________________________ Mass: A measure of how much matter is  ___________________________________ Volume: the measure of the amount of _____________________________________ Density =  Mass Volume Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? Frank also has an eraser. It has a mass of 3g, and a volume of 1mL. What is its density? Jack has a rock. The rock has a mass of 6g and a volume of 3mL. What is the density of the rock? Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the rock? Victoria has a watch. It has a mass of 4g and a volume of 2cm3. What is the density of the watch? Mia has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet?   Finding the Density of a Liquid Materials: Graduated cylinder, triple beam balance, calculator, liquids. 1)Find the mass of the empty graduated cylinder, using the electric scale. 2) Pour liquid #1 into a graduated cylinder to the mL level of your choice. (This is your starting volume)   3) Find the mass of the graduated cylinder with the liquid in it, using the electric scale. 4. Subtract answer from #3, from answer #1 to find the Density Finding the Density of a Solid Materials: solid object, triple beam balance, electronic scale, graduated cylinder 1.) Find the mass of the solid object using a triple beam balance or the electronic scale. 2.) Fill a graduated cylinder to a mL mark of your (this is your starting volume) 3.) Drop in your solid object, and record your volume (this is your ending volume) 4.Your final volume is your ending volume (#3)  – starting volume (#2) 5.) Your density is your mass (#1) / by your final volume (#4)   Name________________________________________ Class_________ Date _______ Comparing Density   Density = mass/volume or D = M/V In this lab we will be comparing the density of different solids. You will need to find the mass of the objects with the tripple beam balance. You can find the volume with the graduated cylinders and water. Be sure to follow all lab safety rules. Wear your safety goggles, don’t eat anything, follow all my directions. Object 1: Name _______________________ Mass________________________  Volume _____________________ Density ______________________ Object 2: Name _______________________ Mass________________________ Volume _____________________ Density ______________________ Object 3: Name _______________________ Mass________________________ Volume _____________________ Density ______________________ Object 4: Name _______________________ Mass________________________ Volume _____________________ Density ______________________ Object 5: Name _______________________ Mass________________________ Volume _____________________ Density ______________________ How does density relate to your life? Where do you see examples of if around you? _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________ How does density relate to our essential questions? _______________________________________________________________________ _______________________________________________________________________ _______________________________________________________________________   LT: I can find the densities of different liquids and solids, in order to determine how to separate a mixture.   Name____________________________ Class_________ Date _______ Step 1: Density of Solids & Liquids   Density = mass/volume or D = M/V Find the MASS of the liquids and solids with the triple beam balance or electronic scale Don’t forget to subtract the weight of the cup from the total weight of the cup and liquid. Find the VOLUME with the graduated cylinders. ***Be sure to follow all lab safety rules. LIQUIDS                                                                                                                               SOLIDS Liquid 1: Name of object: ______________      Mass________________________  Volume _____________________ Calculations: ____________ Density ______________________ Liquid 2: Name of object _______________________ Mass________________________ Volume _____________________ Calculations: ____________ Density ______________________ Liquid 3: Name of object _______________________ Mass________________________ Volume _____________________ Solid 1: Name of object _______________________ Mass________________________ Volume _____________________ Calculations: _____________ Density ______________________ Solid 2: Name of object _______________________ Mass________________________ Volume _____________________ Calculations: ______________ Density ______________________ Solid 3: Name of object __________________ Mass _____________________ Volume __________________ Calculations: ___________                                                                                                            Calculations: ____________________ Density ______________________                                                                         Density: ___________________                        Liquid 4:                                                                                                                                Solid 4: Name of object _____________________                                                              Name of object ___________________ Mass________________________                                                                          Mass: ____________________ Volume _____________________                                                                            Volume:__________________ Calculations  __________________                                                                         Calculations: _________________ Density ______________________                                                                         Density: _____________ Step 2: Density Columns & Mixtures Layer your solids and liquids in a test tube. **Remember that the densest should go into the test tube first. **The least dense should go last.       2. Write down the liquids and solids in the order you put them into the test tube (Least dense) ________________________ (Last in test tube)         ________________________         ________________________         ________________________ (Most dense) ________________________  (First in test tube) Q: What did you observe once you poured the liquids into the test tube?   Q: How does this lab relate to our essential questions about oil spills? Q: How could this information be used by a person separating a mixture? Q: How could density be used in situations outside of school? Extra: There are thermometers that have small glass balls filled with liquid and air suspended in a liquid. When the temperature goes down the glass balls slowly shift from top to bottom one at a time. How do you think this thermometer works?