9/15/2015 Density What is density? Every object has a measureable features such as mass and volume. Density: The ratio of an objects mass to volume Mathematically Density of a Solid The mass of a solid can be measured using a balance. Mass is a measure of ____________________ ______ 1 9/15/2015 Mass Versus Weight Mass and weight are not the same thing. In chemistry, we measure the mass of an object, NOT THE WEIGHT. Mass is a ______________________ of a material. It is measured using a balance. Weight is a measure of _____________________ and therefore can change depending on the gravitational pull. The ____________________________ that of the earth so your weight would __________on the moon but your mass would _____________________. Density of a Solid (cont) The volume of solid can be found 2 ways: 1) direct measurement – ______________ __________________ o Ex: measure a block o _____________________ 2) water displacement – irregular shaped solid o Ex: volume of a stone How to Find Volume Volume is the ____________ ______________________. Measuring volume using graduated cylinders (most commonly). 2 9/15/2015 Water Displacement Calculating the volume of a solid by finding the difference of volumes. Steps: 1) Find a starting value 2) Add the object and read volume 3) Subtract Formula: Density Standards Water is considered to be a standard in terms of density. Water has a density of _____________. If an object floats in water, the object is _____________ than water. If an object sinks in water, the object is ______________ than water. Solving for Density The formula for density is: D = m /V You can rearrange this using algebra to solve for both mass and volume!! m= V= 3 9/15/2015 DENSITY TRIANGLE Example #1: A 3.00 mL sample of water has a mass of 2.99 g. What is the density? Example #2 Oil has a density of 0.90 g/mL. If I have a 30 mL sample of oil, what would be the mass? 4 9/15/2015 Example #3: Aluminum has a density of 2.70 g/mL. If I have a sample of aluminum that has a mass of 5 g, what is the volume of the sample. 5

© Copyright 2022 Paperzz