The student will: Accurately measure the mass and volumeof a substance using the proper measuringdevices Demonstrate how the density of asubstance is determined Describe how density can be used todetermine the identity of a substance
Observable ormeasurableproperty ofmatter. Mass andVolume All matter hasMass & Volume
Any observableproperty ofmatter. Color Texture Hardness Luster Etc.
A physical propertythat is unique to thesubstance, Acharacteristicproperty can be usedto identify thesubstance▪ Density▪ Boiling Point▪ Melting Point▪ Reactivity
Density is aCharacteristicProperty it is auniquecharacteristicof a substance
The density of a substance isconstant and is not dependenton the shape or size .
Determined by the spacing between theparticles as well as mass of the particlesthemselves In general solids are more dense thanliquids Gasses are much less dense thanliquids
The density of water (H2O)▪1 g/cm3= 1 g/mL▪If a substance has a density less thanwater it will float no matter what itsweight.
The ratio ofthe mass of asubstance tothe volumeof asubstanceD = m/V
When a liquid, density is written asgrams per milliliter (g/mL)When a solid, density is written ingrams per cubic centimeter (g/cm3)
Calculate the Mass of the substance (g)▪ Calculate the volume of the substance(cm3)▪ Apply the formula for density (D=m/V)▪ Write density as g/cm3
Calculate the mass of the full container (mf) Calculate the mass of the empty container(me) Subtract the empty mass from the full massto calculate the mass of the liquid mf–me=ml▪ Apply the formula for density (D=m/V)▪ Write density as g/mL