Density
DensityWhy are boys so dense some times?
DEMOMaterials:One liter beaker One small vial (about 25 mL) Cold
water (cooled with ice and let melt) Colored hot water (use a dark
color for best results) Foil Pencil Piece of string
ObservationA. What is density?
Defined as..How much matter is in a space and object
occupies
3PredictionWhat do you think will have greater mass?A gram of
feathersA gram of chocolate
Which one will have more volume? (what does this mean)
1. A gram of feathers2. A gram of chocolate
5To determine the density of an object use:Density = mass (g)
Volume (mL) or (cm3)
Notice the units? These will be included with your answer!!Math
Skills and ScienceWrite the original formulaSolve the formula for
the missing variableSubstitute the values and unitsMathRecord
answer with proper units, box or happy cloudWhich is denser?Make a
predictionChocolateFeathersMass (g)VolumeDensityChocolate mass =
14gChocolate Volume = 12g/cm3 Density = 1.2g/cm3Feather mass = 14
gFeather Volume = 17 cm3Feather density = 0.83 g/cm3
8Work area..Lets practice, regular shaped solidDetermine the
volume of this cube. ____________________
The mass is 20.0 g. What is this cubes density?
_____________________
1.O cm1.O cm1.O cmB. What is density good for anyway?
Density is a physical property of matter Density is specific to
the type of matterExample: water has a density of 1.0g/mLExample:
bag of materials with all the same masses but different
volumesTherefore (drum roll please. )Density can be used to
identify unknown substancesLook the same, right?
3. The only way to change a substances density is to change its
phase! (solid, liquid, gas)
Determining densityChocolate LabMaterialsClean paperElectronic
balanceRuler
Work in a group of fourc. Solid, liquid, gas, and Plasma1. Solid
a state of matter that had a definite shape and volume. Particles
of matter are tightly packed together. The particles cannot change
position. They can only vibrate.
2. LiquidState of matter that has a definite volume but not
definite shape. Liquids are able to change shape because the
particles of a liquid can change position.
You can change the shape of milk when you pour it into different
containers but the volume stays the same.
173. GasState of matter that have no definite shape or volume.
Gas takes the shape of its container.The particles of gases are
constantly moving. They are much farther apart.
4. Plasma:State of matter made up of small electrically charged
particles which make it up. It is very rare on Earth but it is
found in other parts of the universe. You can find it in stars
where the temperature and the pressure are very high
D. Changes in states of matterMatter can change from one state
to another Add heatTake out heatThere are five (5) phase
changes
FreezingLiquid to solidReach the freezing point, heat is
lost212. MeltingSolid to liquidHeat is gained223. Evaporation
Liquid to gasHeat is gained234. CondensationGas to liquidHeat is
released245. SublimationSolid directly to a gas25E. Physical
Properties of matterDensityShapeSizeColorTextureF. Physical ChangeA
change that does not produce a new substanceExample: rip a piece of
paper in halfExample: freeze waterStill the same chemical
composition, can put it back to its original stateG. Chemical
ChangeA change that produces a new substanceExample: burn a piece
of paper
http://www.bbc.co.uk/schools/scienceclips/ages/10_11/rev_irrev_changes_fs.shtml
