CHM 11100

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School

Purdue University *

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111/112

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Chemistry

Date

Jan 9, 2024

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docx

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2

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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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