Units
What measurement do we take in grams?
Mass
A cork with a density of 0.2g/cm3 in water with a density of 1g/cm3
Float
What is the equation for density?
Density = mass/ volume
D = m/V
Aluminum
Element
(Pure substance)
Element
A pure substance that cannot be broken down by ordinary means
What measurement do we take in litres?
Volume
An anchor with a density of 7.8 g/cm3 in water with a density of 1 g/cm3
Sink
A liquid has a mass of 100g and a volume of 10L, what is the density of the liquid in g/L?
U: Density
E: Density = mass/ volume
S: Density = 100g / 10L
A: 10 g/L
Soil
Heterogenous
(Mixture)
Compound
A pure substance that contains two or more different elements.
True or False
We measure volume in grams.
False.
An apple with a density of 0.9 g/cm3 in a liquid with a density of 0.93 g/cm3
Float
What is the density of a substance that has a mass of 95g and a volume of 950 =mL ?
U: Density
E: Density = Mass/ volume
S: Density = 95g / 950 mL
A: Density = 0.1 g/mL
Pure water (H2O)
Compound
(Pure substance)
Homogenous
A mixture that has a uniform composition (can't see the difference in its parts).
Also, can not be separated back into pure substances.
What unit might we see on a graduated cylinder?
cm3
mL
Oil with a density of 0.93 g/cm3 in water with a density of 1 g/cm3
Float
A block of aluminium occupies a volume of 15.0 mL and has a density of 2.7 g/mL. What is the blocks mass?
U: Mass
E: Mass = Density x Volume
S: Mass = 2.7 g/mL x 15.0 mL
A: Mass = 40.5 g
Sugar and water
Homogenous
(Mixture)
Density
The amount of matter per unit of volume.
Provide one unit we may measure density in.
(There are a few different ones)
g/L
g/cm3
kg/m3
g/mL
Why does oil "float" on water?
Oil is less dense than water.
An object has a density of 0.5g/cm3 and a mass of 20g. What volume does the object occupy?
U: Volume
E: Volume = Mass/ Density
S: Volume = 20g/ 0.5 g/cm3
A: Volume = 40 cm3
Muddy Water
Heterogenous
(Mixture)
Atom
The smallest unit (particle) of an element