answer key for data table
model example
Act. 2 Does it Dissolve Challenge Questions: (DOK 1-4)
Make sure you RECYCLE the question in your answer
and answer in complete sentences. ELABORATE!
Some questions are easier than others- work together!
1.
What substances were the solutes and which
are the solvents? DOK 1
The substances that were the solutes
were: sodium chloride (NaCl), and calcium chloride (CaCl)
The solvents used were: water, mineral
oil, and ethanol.
2.
Which solvent/solute pairs dissolved
completely? What is your evidence? DOK 3
The solvent/solute pairs that dissolved
completely were: water and sodium chloride
The evidence for this is that: When we
mixed water and sodium chloride, the salt disappeared into the water. There
were no more particles on the bottom. It made a solution of salt water.
3. A substance that dissolves
in water can be described as soluble in water. List four solids that you think
are soluble in water. DOK 4
Four solids that are soluble in water are: sugar, salt, baking soda,
and infant formula, kool aid, crystal light, powdered lemonade, (food coloring)
4. Insoluble means a solid
does NOT dissolve in water. List 3 solids that do not dissolve in water. DOK 4
The 3 solids that do not dissolve in
water are… cornstarch, flour, baking powder, cinnamon, plastic, sand, and pepper.
5. Must a mixture be clear to
be a solution? Explain. (hint: solution is defined as when the solute dissolves
into the solvent ex: sugar dissolves fully into water) DOK 3 or 4
___NO______, a mixture __does not______ need to be clear to be a
solution. Not all solutions are clear. For example, food coloring in water is
not clear but forms a solution. Red sugar sprinkles will dissolve into a
solution, but the solution will be red, not clear.
6. Imagine that the tested
solids are considered water pollutants. Which would be easiest to remove form
the water? Explain your answer. DOK 4
The easiest solid to remove from the water is…. Sodium chloride can
be boiled and the water will evaporate and leave the salt pollutant behind. Other
dissolved solutes are more difficult to remove.
7. List at least two ways
that water’s ability to dissolve substances can be helpful to people and living
organisms. DOK 4
2 ways that water dissolving can be helpful to people and living
organisms is by making the water filled with good nutrients like fluoride for
our teeth. Also, making salt water can help clean and kill germs in our mouths.
Dissolving sugar and water is used to make different drinks.
8. List at least two ways
that water’s ability to dissolve substances can be harmful to people and living
organisms. DOK 3-4
2 ways that water dissolving can be harmful
is:
·
Bad chemicals can dissolve into the
water and we won’t know they are there
·
Bad germs can dissolve into the water
and we can’t see and we can get sick
·
Water borne diseases
