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Density Science Notes: Understanding Mass, Volume, and Density

This presentation teaches students about density, mass, and volume, and how to calculate density using the formula. It includes demonstrations, examples, and practice problems. Suitable for middle school science students.

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Density Science Notes: Understanding Mass, Volume, and Density

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  1. SPI 0807.9.7 Density Science Notes Tennessee SPI Objective: Apply an equation to determine the density of an object based on its mass and volume. Instructions for Students 1) Make sure you view this presentation in slideshow mode. 2) You can find instructions about how to do this by doing a Google search or by searching YouTube. 3) After you have it in slideshow mode, press the right-arrow keyboard button to advance through the presentation. 4) If you need help, please communicate with your teacher. Check for Understanding Calculate the density of various objects. Essential Question(s) 1) What is density? 2) What is mass, and how do I measure it? 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?

  2. SPI 0807.9.7 Density Notes Science What is density? • 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 • The unit for mass is grams (mg or g or kg) Reminder: volume is how much space it takes up (size) • Unit for solid volume is cubic meters (cm3 or m3 or km3) • Unit for liquid volume is liters (mL or L or kL) Demonstration: • 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

  3. SPI 0807.9.7 Density Science Notes Density Example: • Here are two objects that are the same size. (1) Bowling Ball and (2) Soccer Ball • One of these objects contains more matter (mass). • With two same-sized objects like this (volume), the object with more mass has greater density than the other object. Less Dense More Dense

  4. Density in Liquids • Lower density liquids will float on top • Higher density liquids with sink downward Example:Oil floats on top of water 1) Identify which liquids would occupy levels A, B, and C according to their density. Level A Level B SPI 0807.9.7 (Density) ANSWERS Level C Turpentine (0.8 g/mL) Water (1.0 g/mL) Mercury (13.6 g/mL)

  5. SPI 0807.9.7 Density Notes Science • Density In Liquids • Lower density liquids float on top of liquids with higher density • Higher density liquids will sink belowlower density liquids • View this YouTube Video Clip: • Link: 7-Layer Density Column

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

  7. Solve the Density Problem Shown Below • Go ahead and use a calculator (for now) • Round to the tenths place 1) Calculate the density of an object with a mass of 25g and a volume of 10cm3 Example: 25 (mass) divided by 10 (volume) Units… g/cm3 Density= 10 25 Answer 25 g ÷ 10 cm3 = 2.5 g/cm3 Don't Forget Your Units! Example: grams/centimeter cubed Written like this…g/cm3

  8. Solve the Density Problem Shown Below • Go ahead and use a calculator (for now) • Round to the hundredths place 2) Calculate the density of an object with a massof 45kg and a volume of 43m3 Example: 45 (mass) divided by 43 (volume) Units… kg/m3 Density= 43 45 Answer 45 kg ÷ 43 m3 = 1.05 kg/m3 Don't Forget Your Units! Example: kilograms/meters cubed Written like this…kg/m3

  9. Solve the Density Problem Shown Below • Go ahead and use a calculator (for now) • Round to the hundredths place 3) Calculate the density of an object with a massof 350g and a volume of 95cm3 Example: 350 (mass) divided by 95 (volume) Units… g/cm3 Density= 95 350 Answer 350 g ÷ 95 cm3 = 3.68 g/cm3 Don't Forget Your Units! Example: grams/centimeters cubed Written like this…g/cm3

  10. SPI 0807.9.7 Density Which cube below has the GREATEST density? Again…go ahead and use a calculator (for now) Round to the tenths place Notes Science (B) (A) Mass: 11g Volume: 3cm3 Mass: 23g Volume: 5cm3 Mass: 12g Volume: 3cm3 Mass: 19g Volume: 7cm3 2.7 g/cm3 4 g/cm3 (D) (C) 4.6 g/cm3 3.7 g/cm3

  11. SPI 0807.9.7 Density Science Notes Note: The density formula can be rearranged to find the mass or volume. M D M V or Density = Mass divided by volume V= D= or Mass = Volume x Density m = V x 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 Volume = Density divides Mass or

  12. SPI 0807.9.7 Density Science Notes Memory Trick: DMV to MVD to VDM • 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? Remember: Think M for multiply! 3) VDM Question: What does VDM stand for?

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