L8 - Density PDF

Lesson 8 - Density Wednesday, January 29, 2025 Learning objective: Explore density and how to calculate it Secure Key Words: Density, Volume, Mass,...

Lesson 8 - Density Wednesday, January 29, 2025 Learning objective: Explore density and how to calculate it Secure Key Words: Density, Volume, Mass, Explain how to Developing measure the density of an Describe how to irregular object measure the volume of Emerging irregular objects Define and calculate density Starter: Practical Demonstration Why does oil float on top of water? Why does some objects float and others sink?  Define and calculate density LO’s Describe how to measure the volume of irregular objects What is Explain how to measure the density of an irregular object Density? Density describes how closely packed the particles are in solids, liquids, and gases. It is a measure of compactness and the ratio of mass to volume. Units: kg/m³ or g/cm³. Density of Water Water has a density of 1 g/cm³ (1,000 kg/m³). This is a reference point for comparing other materials.  Define and calculate density Key Concepts of Density LO’s Describe how to measure the volume of irregular objects Explain how to measure the density of an irregular object Density = Mass ÷ Volume (p = m/V). Mass is the amount of matter in an object (kg or g). Volume is the space an object occupies Example: (m³ For or cm³). 0.45 m³ volume with a mass of 0.2 kg Density = 0.44 kg/m³  Define and calculate density Key Concepts of Density LO’s Describe how to measure the volume of irregular objects Explain how to measure the density of an irregular object In labs, mass is often in grams and volume in cm³. Example: For 15 cm³ with a mass of 30g Density = 2 g/cm³.  Define and calculate density LO’s Describe how to measure the volume of irregular objects Unit Conversion Explain how to measure the density of an irregular object 1 g/cm³ = 1,000 kg/m³. Example: Aluminum density is 2.7 g/cm³ or 2,700 kg/m³. Convert the following of common materials Lead: 11.3 g/cm³ (11,300 kg/m³). Iron: 7.9 g/cm³ (7,900 kg/m³).  Define and calculate density LO’s Describe how to measure the volume of irregular objects Calculating Density Explain how to measure the density of an irregular object Calculate the density of the following materials: Steel cube: Mass = 468 g, Volume = 60 cm³ Density = 7.8 g/cm³ Stone: Mass = 166 g, Volume displaced = 68 cm³ Density = 2.4 g/cm³  Define and calculate density States of Matter LO’s Describe how to measure the volume of irregular objects Explain how to measure the density of an irregular object All matter contains particles. The arrangement of particles differs in solids, liquids, and gases. Solids and liquids have closely packed particles; gases have particles spread apart. ensity in Different States Little difference in density between a liquid and its solid form (e.g., water and ice). Gases have lower density due to greater volume occupied by the same mass.  Define and calculate density LO’s Describe how to measure the volume of irregular objects How do you measure the density Explain how to measure the density of an irregular object of an irregular shaped object? Measure the mass of the object using a top-pan balance 2. Measure the volume using the displacement method https://www.youtube.com/watch?v=lvqu6JAbaKc  Define and calculate density LO’s Describe how to measure the volume of irregular objects Explain how to measure the density of an irregular object hod: Measuring Density of a irregularly shape object Weigh the object Fill the vessel to almost overflow Place the cylinder under the overflow vessel tube Dip the object with the string attached until fully submerged Calculate the volume of the water that overflowed Then calculate the density (D=M/V)