Experiment 1: Density Flashcards
Density=
mass/volume
Density is a _____ property.
Intensive (independent of the amount of substance and is constant for all pure samples.
High density implies_______ on the molecular level
Tighter packing which implies stronger molecular interactions.
Water is most dense at what temperature?
4 C
Specific gravity is?
The ratio of the density of a substance to that of water. It is temperature dependent. No units for specific gravity.
Density Calculations
Find mass of object. Find volume. Easy stuff.
Density of a block of wood, metal cylinder, etc.?
1) Measure with ruler.
2) Weigh with balance
3) Divide.
Density of a rock?
1) Take mass in air.
2) Mass submerged in water
3) Difference = mass water displaced
4) Mass water=Vol. Water=volume rock
Density of PVC?
1) Take mass of empty graduated cylinder.
2) Make a CaCl2 solution that allows levitation
3) Take mass of full cylinder
4) Read volume of solution
If the PVC floats?
The solution is too dense
If the PVC sinks?
The solution is not dense enough
What are intensive properties, name 3 examples?
A property independent of the amount of substance, constant for pure samples. Examples: Time, melting point, boiling point
What are extensive properties?
Property of a substance dependent on how much of it there is. Examples: Mass, volume, length
How to calculate the mass of displaced water?
(Mass rock in air) - (Mass rock in water) = mass of water displaced. (kg)
Mass of water displaced also equals….
the volume of water displaced (L)
