Measuring Matter
Measuring MatterChapter 1.2WritingSkim pages 16-20Write all the
bold words and their definitions in your notebook.Weight and
MassWeight: measure of the force of gravity on you
Depends on gravity!Weight and MassMass: amount of matter in the
object
Mass does not change with location!
Mass is a physical propertySI systemInternational System of
Units
Unit for mass is the kilogram (kg)
1,000 grams = 1 kilogram0.001 kilograms = 1 gramActivityUse the
balance to find the mass of the objects in the bag + one of your
choosing
Record the objects and their mass in an organized
tableVolumeVolume: amount of space that matter occupies
Solids, Liquids and GasesBalloonsUnits of VolumeLiter (L),
milliliter (mL), cubic centimeter (cm3)
1 cm3 = 1mL
Liquids are measured with a Graduated CylinderCalculating
volumeRectangular ObjectsVolume = Length x Width x
HeightV=(L)x(W)x(H)Length is 20 cm, height is 9.5 cm and width is
5.7 cm, what is the volume?Calculating VolumeV =
(20cm)(9.5cm)(5.7cm)
(cm)(cm)(cm) = cm3
V = 1,083cm3Volume of Irregular ObjectsHow can you find the
volume of irregular objects?
Write an explanationHint: SubmersionActivityUsing the graduated
cylinder, calculate the volume of each item in the bag
Record your data in an organized table, make a column for the
item, the volume, the mass, and the densityDensityDensity:
Measurement of how much mass of a substance is contained in a given
volume
Units are g/cm3Density of WaterDensity of water at room
temperature is 1g/cm3Float < 1g/cm3 < SinkCalculating
DensityDensity(D) = Mass(M)/Volume(V)D=M/VA block has the mass of
200g and the volume of 250 cm3, what is the density of this block?
Can the block float?Practice problemsWhat you do not finish is
homework
Test ThursdayChanges in MatterPhysical Change: Alters form or
appearance but does not make any substance into a different
substance
Chemical Change: A change in matter that produces one or more
new substancesPhysical ChangesA substance that undergoes a physical
change is still the same substance after the changePhysical Change
ExamplesChanging state of
matterDissolvingBendingCrushingStretchingBreakingChemical
ChangesProduces a new substance with properties different from
those of the orginal substanceChemical Change ExamplesBurning
natural gasCombustionElectrolysisOxidationTarnishingActivityUse
observationDo you think a new substance is formed?If so, provide
evidenceConservation of MassMatter is not created or destroyed in
any physical or chemical change!
Burning a candle
Atoms are not lost or gained, only rearrangedMatter and Thermal
EnergyEnergy: Ability to do work, or cause change
TemperatureTemperature: average energy of random motion of all
particles in a substance
Cold = SlowHot = FastThermal EnergyTotal energy of all particles
in the object
Flows from warmer matter to cooler matter
Endothermic vs ExothermicEndothermic: takes in energy
Exothermic: Releases energyAssignmentPage 27 1-3 all partsForms
of
EnergyKineticPotentialChemicalElectromagneticElectricalThermalKineticEnergy
of matter in motionAnything that is moving has kinetic
energyPotential EnergyEnergy an object has because of its
positionChemical EnergyInternal energy stored in chemical bonds
Chalk and VinagerElectromagnetic EnergyTravels through space as
wavesVisible lightInferredUVRadio wavesGamma raysMicrowaveCell
phonesElectrical EnergyElectrical charged particles moving from one
place to another
ElectrolysisBatteriesElectrodesTransforming EnergyBurning a
candle
Pushing a bike up a hill
Photosynthesis
