CHM 11100
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CHM 11100
Activities and Explorations
Claim, Evidence, Reasoning
Conductivity demonstration due September 18 at 11:59 PM, worth 10 points
Instructions: Upload your work on this page to Brightspace by typing or writing your
responses and saving the file as a PDF file with your first and last name and upload that
file. You can also take pictures of your written work and paste them in!
Learning Objectives
Differentiate between ionic and covalent bonding, and classify the bonding in
a compound as ionic or covalent. (This relates back to chapter 2 material.)
Distinguish between electrolytes and nonelectrolytes, and between strong
electrolytes and weak electrolytes.
Watch the conductivity demonstration video and answer the following questions.
Data observations (evidence):
1.
(2 pts) Dr. Towns demonstrated what happens to 5 solutions when placed on the
conductivity apparatus. Write down your observations of what happened when
each solution was placed on the conductivity apparatus during the video.
Those
which produce a bright light are called strong electrolytes, those which give a dim
light are weak electrolytes, and no light indicates a non-electrolyte.
Solution
Observation
Electrolyte type (strong,
weak, or non)
Deionized water
No light has been
generated
non
Tap water
The light is on (a little
dim)
Weak
Salt (NaCl) water
A super bright light
shines
strong
Sugar water
No light generated
non
Vinegar
Bright light shines
strong
2.
(2pts) What happens to electrolytes on a molecular level when they are placed in
water (you can use salt water as an example)? (Hint:
What must be present in
the solution in order for the light to turn on?)
In order for the light to turn on at a high voltage, salt must be present. The light turned
on with no salt, but the shines was pretty dim.
3.
(2 pts.) Imagine you have an aqueous solution of ammonium chloride, NH
4
Cl. Much like
sodium chloride, NaCl, ammonium chloride (NH
4
Cl) dissolves easily in water.
NaCl and
NH
4
Cl are both ionic compounds.
When NH
4
Cl dissolves in water what ions are
produced?
NH
4+
and CL
-
4.
Now, imagine you have an aqueous solution NH
4
Cl of in a beaker and you put it on the
conductivity apparatus just like Dr. Towns did in the demonstrations.
Claim
: (1pt) Write a claim what you think will happen to the light bulb when the
NH
4
Cl solution is put onto the conductivity apparatus.
I believe the light bu;d will turn on with a strong voltage
5.
Reasoning
: (3 pts) Explain your reasoning to support your claim about what
happens when you place an NH
4
Cl solution is put onto the conductivity
apparatus.
(1 pt) Discuss what type of compound NH
4
Cl is.
(1 pt) Explain what happens when NH
4
Cl dissolves in water.
(1 pts) Explain
why
the light bulb doesn’t come on, burns dimly, or burns brightly!
NH
4
Cl is an ionic compound due to it being created by the combination of a polyatomic ion and a metal.
When this substance is dissolved in water, the bond breaks off into NH
4+
and Cl- . Since there are free
floating ions that are not bonded to anything, they create a charge which then powers the light bulb to
shine brightly.
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