Density What is Density In the last activity you discovered that no matter how much substance you used the masstovolume ratio stayed the same This ratio is density Density A measure of ID: 535466
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Slide1
Fluids
DensitySlide2
What is Density?
In the last activity, you discovered that no matter how much substance you used, the mass-to-volume ratio stayed the same. This ratio is density.
Density – A measure of
the amount of matter (mass) per unit volume of a substance.Density can be determined using an equationThe common units of measurement for density of solids and liquids are g/mL or g/cm³, and for gases, kg/m³.Slide3
Calculating Density
An empty container has a mass of 50g. When 75mL of oil are placed in it, the total mass is 120g. Calculate the density of oil.
Given: mass of container = 50g
mass of container & oil = 120g
Volume of oil = 75mL Need to find mass of oil first: Mass = 120g – 50g = 70g Use the formula to find density: Density = mass/volume = 70g/75mL = 0.93g/mL
Therefore, the density of the oil is 0.9g/mL.Slide4
Floating Coke Demo
Floating/Sinking Coke?
T/P/S: Based on
the demonstration
and on the density formula, how would you … a) Increase density? b) Decrease density? c) Real-life examples?Slide5
Density & The Particle Theory
You can use the particle theory to help explain density:
Particles of a solid are usually more closely packed than particles of a liquid, which are more closely packed than particles of a gas.
Therefore, solids are
generally denser than liquids, which are denser than gases.Density is also affected by the type of particles a substance is made of.Oil and water are both liquids, but water is much denser.Helium is much less dense than air.Slide6
Density & Floating Eggs
With the materials, follow the
instructions provided to
complete the lab. Using the particle theory, explain how density affects each egg (tap water & salt water). Use a diagram to explain each.Video: Floating Egg
Video: Density & Temperature: Underwater VolcanoMcSteiger Science: Floating Eggs & Underwater VolcanoSlide7
Density of Some Common MaterialsSlide8
Homework Questions
Use the particle theory to explain densities in solids, liquids, and gases.
Calculate the density of a diamond if the volume of the diamond is 0.50cm and its mass is 1.75g.
To prep for the upcoming lab, research the densities of:
Water, Rubbing Alcohol, Maple Syrup, Laundry Detergent, Vegetable OilSlide9
Science Lab: Layer Liquid
Introduction:
Seven Layer Density
Lab Prep:
Read over lab handoutComplete a hypothesis & variablesCreate the necessary tables for observationsSlide10
Lab Chart Example - Liquids
Fluid
Density
Observations
WaterRubbingAlcoholMapleSyrupLaundry Detergent
VegetableOilSlide11
Lab Chart Example – Gas & Solids
Fluid/
Object
Observations
Density(Description)Air BubbleWooden BeadPlastic Gem
BoltPopcorn Kernel