Presentation on theme: "A Look at Density and How to Calculate It."— Presentation transcript:
1 A Look at Density and How to Calculate It. Diggin’ That DensityA Look at Density and How to Calculate It.
2 Remember Back Mass- Amount of matter something is made of. Volume – Amount of Space something takes up. It is 3-Dimensional
3 Remember Back Mass- Measured in grams (g). Volume – Measured in milliliters (mL) or in cubic centimeters (cm³)
4 Remember Back Mass is how much of something you have. So volume is the amount of space you have and….
5 Bring it Together Density is a combination of volume and mass. Density is the amount of matter in a given volume.The amount of “stuff” in a certain “space”
6 Figuring it OutThere is a mathematical formula for calculating density.Density = Mass VolumeD = M V
7 Units for DensityJust like length, volume and mass density has to be labeled with the correct unit.g/cm³ or g/mL is the standard unit for density.Remember that a cm³ is basically the same as a mL.
8 D. Density V = 825 cm3 M = DV D = 13.6 g/cm3 M = (13.6 g/cm3)(825cm3) An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass.GIVEN:V = 825 cm3D = 13.6 g/cm3M = ?WORK:M = DVM = (13.6 g/cm3)(825cm3)M = 11,220 g
9 D. Density D = 0.87 g/mL V = M V = ? M = 25 g V = 25 g 0.87 g/mL 1) A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid?GIVEN:D = 0.87 g/mLV = ?M = 25 gWORK:V = MDV = g0.87 g/mLV = 28.7 mL
10 D. Density M = 620 g D = M V = 753 cm3 D = ? D = 620 g 753 cm3 2) You have a sample with a mass of 620 g & a volume of 753 cm3. Find density.GIVEN:M = 620 gV = 753 cm3D = ?WORK:D = MVD = g753 cm3D = 0.82 g/cm3
11 Let’s PracticeLiquid E had a mass of 82.61g. You massed 100mL of this liquid.Plug it into the formula.
13 Will it Float?Density can predict if something will float. How?
14 Will it Float?The object with a higher density than water sinks. If it has lower density it floats.
15 Density of WaterUsing our results from yesterday, what is the density of sea water?g 100 mL =g/mL.
16 Measuring waterIf you wanted to measure 25ml of water, what instrument would you use?
17 Density of Water Calculate the density of water One milliliter of waterHas a mass of 1 gramDensity = Mass ÷ VolumeCalculate the density of water1g ÷ 1ml = 1g/ml
18 Measuring waterIf you wanted to measure 25ml of water, what instrument would you use?
19 Measuring water 2If you wanted to measure 25 grams of water, what 2 instruments could you use?
20 Measuring volume of a solid by water displacement
21 One cubic centimeter = one milliliter Using water displacement,how many milliliters doyou expect the waterto raise when the cubeis lowered?This cube’s sides areeach 3 cm. What isthe volume of the cube?27 cubic cm27 ml
22 Graduated cylinder measurement Volume is measured using a graduated cylinder.When reading a graduated cylinder, read the bottom of the meniscus.