ANSWERS in BOLD___
Name: __
What do I have to do to feel confident and prepared for the Density and End of Solubility Quiz?
Remember when we . .
Students should be able to . . .
REVIEW
… remember when we made
sugar water.
Solubility – End of Topic Items
. . . remember when we
identified an unknown
compound by comparing how
much would dissolve?
..mixed sugar with water and oil
to determine if everything
dissolves in everything.
Describe the features of solution and give an example. A solution is a homogenous mixture with
ingredients spread evenly throughout. An example is sugar water.
Use your own words to define solubility.
Solubility is the extent of a solute’s ability to be dissolved and stay mixed in a solvent. Solubility is a
measure of how much solute can be dissolved and stay mixed in a liquid.
How could solubility be used to identify a substance?
Since solubility is a characteristic property, the amount of any matter that dissolves in a solvent is
unique to each type of matter. To help identify an unknown, you could observe what happens when
the solute is mixed with a solvent and compare the results to the solubility of known substances.
Does everything dissolve in everything?
Everything does not dissolve in everything. I know this because I observed that sugar didn’t dissolve in
oil. I also know because I don’t lose any part of my body when I go swimming. 
What word do we use to describe a substance that doesn’t dissolve in another substance? When sugar
didn’t dissolve in oil, I could say that sugar is insoluble in oil.
Density
. . .put different items in order
from lowest density to highest
density.
..measured the mass and found
the volume of the wood, glass,
and steel spheres of different
sizes.
Define the concept of density in your own words.
Density describes the amount of mass for an object’s size. Low density matter has a low amount of
mass for its size.
Describe the difference between mass and volume.
Mass is a measure of the amount of matter (atomic stuff, atoms/molecules). Volume is a measure of
the amount of space occupied by an object.
Describe the size of units you use to measure and report mass and volume.
Mass is most often reported in grams, but you can use kilograms. Volume can be reported in cubic
centimeters (cm3) or in milliliters (ml). 1 cm3 = 1 ml. Larger volumes are measured in liters, like 2-liter
soda bottles.
What is the density of a wood block that has a mass of 40 grams and a volume of 80 cm3.
Density = mass/ volume, so the density of the wood = 40 g/ 80 cm3 = 0.5 g/ cm3
What units of measure do you have when you calculate density? The units of measure for something I
calculate are the units of measure for whatever quantities I use to make the calculation. Since density
is mass divided by volume, the unit for density are g/ cm3
Draw the density triangle and the density heart.
Density =
ass
olume
m
D*v
Use the density triangle to write the formula would you use to find mass if you know the density and the
volume of an object mass.
mass = Density * volume
Use the density triangle to write the formula would you use to find volume given the density and the
mass of an object.
volume = mass/Density
Describe if changing the size of a sample of a substance changes its density.
No changing the size of the sample won’t change the density because the amount of mass in a set
volume is constant. Said another way, changing the size of the sample won’t change the density
because when you change the size, the mass also changes.
. . . used colored circles and
drew on our desks to show
different densities.
Describe the features of a particular type of matter that can explain why it has a high density or a low
density.
The density of matter is affected by how tightly packed the atoms/molecules are and by the type of
atoms/ molecules (elements) that make up the matter.
Would a substance with a high density have a high amount or a small amount of matter packed in a
specific volume?
A substance with a high density would contain a high amount of matter packed in a specific volume.
Which substance is more dense based on these drawings?
Support your answer with evidence.
Substance B is more dense because
there is more matter packed in the same space
A
B
Fill in the “Packing or Element Types” that will explain the density relative to the other types of matter
Material
Density (g/cm3)
Packing or Element Types?
Air (1 atm, 20 degrees C)
.0012
Styrofoam
.015
Wood - pine
0.70
Ethanol
.810
Ice
.920
Opaque White Plastic
0.97
Water (Freshwater)
1.00
Seawater (Saltwater)
1.03
Mostly packing, lots of space
between molecules
Mostly packing because the
molecules are long and don’t pack
well leaving space between
molecules
Mostly packing because the
molecules are long and don’t pack
well leaving space between
molecules
Mostly elements, the elements in
this molecule, carbon, hydrogen
and oxygen are lighter
Mostly elements, the elements in
this molecule, hydrogen and
oxygen are lighter. This is less
dense than water because the
volume increases when water
freezes
Mostly packing because the
molecules are long and don’t pack
well leaving space between
molecules
Mostly elements, the elements in
this molecule, hydrogen and
oxygen are lighter.
Mostly elements, the elements in
this mixture, sodium, chlorine,
Transparent plastic
1.17
Blood
1.60
Concrete
2.00
Graphite (carbon, pencil lead)
2.15
Granite
Diamond (carbon)
2.80
3.5
Hematite (iron oxide, Fe2O3)
5.1
Stainless Steel (solid solution of iron, carbon, & chromium)
7.40
Galena (lead sulfide, PbS)
7.6
Zinc
7.14
Brass (solid solution of copper & zinc)
8.60
Copper
8.96
lead
11.3
Adapted From: http://physics.about.com/od/fluidmechanics/a/commondens.htm
hydrogen and oxygen are lighter.
Mostly packing because the
molecules are long and don’t pack
well leaving space between
molecules
Blood is more dense than water
because of the cells and proteins
packed in
Packing is high, but mass of
elements is lower
It’s only carbon, but packed
tightly
It’s only carbon, but packed very
tightly
High packing AND the elements
have higher mass.
High packing AND the elements
have higher mass.
High packing AND lead has a
much higher mass.
High packing AND the elements
have higher mass.
High packing AND the elements
have higher mass.
High packing AND the elements
have higher mass.
High packing AND lead has a
much higher mass.