Concept explainers
Videos
Materials Needed:
- Alka-Seltzer tablets (8)
- 1/4 cup of water
- 2 small plastic cups
- Sealable plastic bag (1)
- Kitchen scale
Can you observe the law of conservation of matter if a gas is produced in a
The law of conservation of matter states that atoms are not created or destroyed during a chemical reaction. For your experiment, we are challenging you to demonstrate this law through the dissolution of Alka-Seltzer tablets in water.
Alka-Seltzer tablets function as an antacid and pain reliever, with aspirin as the analgesic. When the tablets are dissolved in water, citric acid and sodium bicarbonate are dissolved and react to form water and carbon dioxide. The formed sodium citrate and aspirin are dissolved in the water and can be consumed to help with heartburn and pain relief. In this experiment, you can observe whether or not atoms are lost in the reaction, and, therefore, you are observing the law of conservation of matter.
First, measure 1/3 cup of water into a small plastic cup. Record the weight of the water and the cup using a kitchen scale. (Hint: set it to grams.) Drop 4 Alka-Seltzer tablets into the water and immediately record the total weight. Write down your observations as the tablets dissolve in the water. What observations can you make about the mixture?
After the reaction is completed, measure the final weight of the mixture. Did you see a difference in the weight before and after the reaction?
For the next step, run the reaction again, but this time, place both the 1/3 cup of water and the 4 Alka-Seltzer tablets on opposite sides of the plastic bag. Seal the bag and then move the Alka-Seltzer tablets into the cup of water. Be sure to record the total weight of the mixture in the bag before and after the reaction.
2. Did you see a change in the weight of the mixture in the sealed bag? Why or why not?
Want to see the full answer?
Check out a sample textbook solution
Chapter 2 Solutions
Chemistry for Changing Times
- 10. Stereochemistry. Assign R/S stereochemistry for the chiral center indicated on the following compound. In order to recieve full credit, you MUST SHOW YOUR WORK! H₂N CI OH CI カー 11. () Stereochemistry. Draw all possible stereoisomers of the following compound. Assign R/S configurations for all stereoisomers and indicate the relationship between each as enantiomer, diastereomer, or meso. NH2 H HNH, -18arrow_forwardb) 8. Indicate whether the following carbocation rearrangements are likely to occur Please explain your rational using 10 words or less not likely to occur • The double bond is still in the Same position + Likely to oc occur WHY? -3 H3C Brave Chair Conformers. Draw the chair conformer of the following substituted cyclohexane. Peform a RING FLIP and indicate the most stable conformation and briefly explain why using 20 words or less. CI 2 -cobs ?? MUST INDICATE H -2 -2 Br EQ Cl OR AT Br H& most stable WHY? - 4arrow_forwardCH 12 Conformational Analysis. Draw all 6 conformers (one above each letter) of the compound below looking down the indicated bond. Write the letter of the conformer with the HIGHEST and LOWEST in energies on the lines provided. NOTE: Conformer A MUST be the specific conformer of the structure as drawn below -4 NOT HOH OH 3 Conformer A: Br OH A Samo Br H 04 Br H H3 CH₂ H anti stagere Br CH clipsed H Brott H IV H MISSING 2 -2 B C D E F X 6 Conformer with HIGHEST ENERGY: 13. (1 structure LOWEST ENERGY: Nomenclature. a) Give the systematic (IUPAC) name structure. b) Draw the corresponding to this name. HINT: Do not forget to indicate stereochemistry when applicable. a) ८८ 2 "Br {t༐B,gt)-bemn€-nehpརི་ཚ༐lnoa Parent name (noname) 4 Bromo Sub = 2-methylethyl-4 Bromo nonane b) (3R,4S)-3-chloro-4-ethyl-2,7-dimethyloctane # -2 -2arrow_forward
- in the scope of the SCH4U course! please show all steps as im still learning how to format my answers in the format given, thank you!arrow_forwardhelp me solve this HWarrow_forwardMolecules of the form AH2 can exist in two potential geometries: linear or bent. Construct molecular orbital diagrams for linear and bent CH2. Identify the relevant point group, include all of the appropriate symmetry labels and pictures, and fill in the electrons. Which geometry would you predict to be more stable, and why? (Please draw out the diagram and explain)arrow_forward
Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning
Chemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning
Introductory Chemistry: A FoundationChemistryISBN:9781285199030Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning
ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage Learning