Notes SPI 0807 9 7 Density Science Tennessee

Notes SPI 0807. 9. 7 Density Science Tennessee SPI Objective: Apply an equation to determine the density of an object based on itsfor mass and volume. Instructions Students Check for Understanding 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Calculate the density of various objects. Google search or by searching Essential. You. Tube. Question(s) 3) have it in slideshow mode, press the right-arrow 1)After Whatyou is density? keyboard button to advance through the presentation. 2) What is mass, and how do I measure it? 4) If you need help, please communicate with your teacher. 3) What is volume, and how do I measure it? 4) How do I calculate density? 5) How do I multiply and divide with decimals without a calculator?

Notes SPI 0807. 9. 7 Density Science What is density? Ø Density is the amount of matter (mass) you have crammed in a given space (volume) Reminder: mass is how much matter is in an object Ø The unit for mass is grams (mg or kg) Reminder: volume is how much space it takes up (size) Ø Unit for solid volume is cubic meters (cm 3 or km 3) Ø Unit for liquid volume is liters (m. L or k. L) Demonstration: Ø Ø Demonstrate with wadded up paper in a trash can Can about 1/4 full-explain that the density is low Can about ¾ full…explain that the density has increased Explain-density can be increased by putting in more paper

SPI 0807. 9. 7 Density Notes Science Density Example: Ø Here are two objects that are the same size. (1) Bowling Ball and (2) Soccer Ball Ø One of these objects contains more matter (mass). Ø With two same-sized objects like this (volume), the object with more mass has greater density than the other object. More Dense Less Dense

Density in Liquids Ø Lower density liquids will float on top ØDesignation Higher density. Substance liquids with sink downward Density Oil floats on top of Liquid. Example: 01 Water 1. 0 water g/m. L Liquid 02 Liquid Mercury 13. 6 g/m. L Liquid 03 Turpentine 0. 8 g/m. L 1) Identify which liquids would occupy levels A, B, and C according to their density. SPI 0807. 9. 7 (Density) ANSWERS Level A Turpentine (0. 8 g/m. L) Level B Water (1. 0 g/m. L) Level C Mercury (13. 6 g/m. L)

Notes SPI 0807. 9. 7 Density Science Density In Liquids ØLower density liquids float on top of liquids with higher density ØHigher density liquids will sink below lower density liquids View this You. Tube Video Clip: Link: 7 -Layer Density Column

Calculating density Ødivide the mass by the volume of the object Density Formula or Density = mass divided by volume or Dividend is the number. Math being divided. Vocab: In this case it will be the numberand for Divisor mass. Dividend Divisor is a number that divides into another number In this case…it will be the number for volume. Memory Trick Ø Soon you will get your first driver’s license (scary!) Ø The place where you receive your driver’s permit is called the DMV (Department of Motor Vehicles) Ø Think of DMV for density

Solve the Density Problem Shown Below Ø Go ahead and use a calculator (for now) Ø Round to the tenths place 1) Calculate the density of an object with a mass of 25 g and a volume of 10 cm 3 Example: 25 (mass) divided by 10 (volume) Units… Density= 10 25 Answer 25 g ÷ 10 cm 3 = 2. 5 g/cm 3 Don't Forget Your Units! Example: grams/centimeter cubed Written like this…g/cm 3

Solve the Density Problem Shown Below Ø Go ahead and use a calculator (for now) Ø Round to the hundredths place 2) Calculate the density of an object with a mass of 45 kg and a volume of 43 m 3 Example: 45 (mass) divided by 43 (volume) Units… Density= 43 45 Answer 45 kg ÷ 43 m 3 = 1. 05 kg/m 3 Don't Forget Your Units! Example: kilograms/meters cubed Written like this…kg/m 3

Solve the Density Problem Shown Below Ø Go ahead and use a calculator (for now) Ø Round to the hundredths place 3) Calculate the density of an object with a mass of 350 g and a volume of 95 cm 3 Units… Example: 350 (mass) divided by 95 (volume) 3 g/cm Density= 95 350 Answer 350 g ÷ 95 cm 3 = 3. 68 g/cm 3 Don't Forget Your Units! Example: grams/centimeters cubed Written like this…g/cm 3

SPI Which cube below has 0807. 9. 7 the GREATEST density? Notes Science Again…go ahead and use a calculator (for now) Density Round to the tenths place (B) (A) Mass: 12 g Volume: 3 cm 3 Mass: 19 g Volume: 7 cm 3 4 g/cm 3 2. 7 g/cm 3 (C) (D) Mass: 11 g Volume: 3 cm 3 Mass: 23 g Volume: 5 cm 3 3. 7 g/cm 3 4. 6 g/cm 3

Notes SPI 0807. 9. 7 Density Science Note: The density formula can be rearranged to find the mass or volume. Density = Mass divided by volume or D= M V Mass = Volume x Density or m = V x D Volume = Density divides Mass M or V= D Memory Trick: DMV to MVD to VDM A) Start with DMV for density B) Move the first letter (D) to the end C) Now you have MVD for mass (think M for multiply!) D) Move the first letter (M) to the end E) Now you have VDM for volume

Notes SPI 0807. 9. 7 Density Science Memory Trick: DMV to MVD to VDM Ø Now let’s practice this with the small dry-erase boards 1) DMV Question: What does DMV stand for? 2) MVD Question: What does MVD stand for? 3) VDM Question: What does VDM stand for? Remember: Think M for multiply!