Presentation on theme: "A Characteristic Property of Matter"— Presentation transcript:
1 A Characteristic Property of Matter DensityA Characteristic Property of Matter
2 Density Density is a basic characteristic property of all matter A characteristic property is a property that stays the same for a particular type of matter. For instance: H2O boils at 100 oC and freezes at 0 oCEvery substance has a density that can be measuredScientists use density to help identify different kinds of matter
3 Formula for calculating density Density is mass per unit of volumeDensity is mass divided by volumeD =
4 Unit for Density g/ml or g/cm3 Mass is measured in grams Volume is measured inml or cm3Therefore, the unit for density isg/mlorg/cm3
5 How Do We Measure mass?Scientists use a triple beam balance to measure mass.What is the mass illustrated on the triple beam balance?
6 How do we measure volume? How would you use to measure the volume of a regularly shaped object, such as a box?Which one is the meterstick?V = l x w x hHow would you use to measure the volume an irregularly shaped object, such as a rock?
7 WATER DISPLACEMENT METHOD You Have Choices!Both choices involve waterBoth choices move water out of the way to make room for the objectTo move something out of the way to make room for something else is called DISPLACEMENTTherefore, this method is referred to as theWATER DISPLACEMENT METHOD
8 But First, let’s review how to read the volume of a fluid Does the word meniscus ring a bell?Meniscus: the curvature of a liquid in a tubeMost liquids curve down, some curve upIf the liquid curves down, you measure the bottom of the curveIf the liquid curves up, you measure the top of the curveWhat is the volume of the H2O and the Hg (mercury)?
10 OK, back to the choices!Method #1: Place object in graduated cylinder and read the increase in volume.Method #2: Place the object in an overflow can and measure the amount of water displaced.
11 Question How would you measure the MASS of a liquid? What must you remember to do first?
12 Now you can calculate density You can measure the mass of the objectYou can measure the volume of the objectDivide the mass of the object by it’s volume andyou have calculated the density
13 Minds on Science Obtain 2 different size graduated cylinders Fill each cylinder about half full with H2ODetermine mass and volume of the H2O in each cylinderCalculate the density of the water in cylinder #1Calculate the density of the water in cylinder #2What did you find out?
14 density Density of a substance is a characteristic property This means that density will always be same for that substance no matter the size or amount.Example: The density of H2O is always 1g/ml or 1g/cm3
15 THINK Minds on! Explain this, if you can Hint, density is involved and something else that can affect the density of a liquid.THINK