- Questions Experimental Data Molecular Structure Solvent Water Number Of Drops 50 56 62 49 29 52 42 52 43 22 5 1 (39.83 KiB) Viewed 12 times
- Questions Experimental Data Molecular Structure Solvent Water Number Of Drops 50 56 62 49 29 52 42 52 43 22 5 2 (38.38 KiB) Viewed 12 times
- Questions Experimental Data Molecular Structure Solvent Water Number Of Drops 50 56 62 49 29 52 42 52 43 22 5 3 (38.53 KiB) Viewed 12 times
- Questions Experimental Data Molecular Structure Solvent Water Number Of Drops 50 56 62 49 29 52 42 52 43 22 5 4 (44.55 KiB) Viewed 12 times
- Questions Experimental Data Molecular Structure Solvent Water Number Of Drops 50 56 62 49 29 52 42 52 43 22 5 5 (32.58 KiB) Viewed 12 times
b. Look over the data in the table above. In a paragraph, explain the data using an argument that includes the specific topics of intermolecular forces and polarity. C. Each data point above was collected by a different person. Provide two possible experimental errors that can explain the variability in the number of drops on a penny for each of the liquids. d. Application question: Vitamins are essential micronutrients. Some vitamins are soluble in water, and some are soluble in fat. Their solubility has implications in how we cook and how much we can consume safely each day. Identify which of the vitamins pictured below would be largely excreted in urine if an excess is consumed and which vitamin could be stored in fatty tissue in the body. Explain how you decided. CH rih OH CH CH, CH NH Figure 1 Figure 2
Radiation Originally, we thought the first persons in America were from about 11,000-13,000 years ago. Recently, footprints were discovered in Colorado dating from 21,000-23,000 years ago. They determined this using radiometric carbon dating. 1. Identify the similarities and differences between an alpha particle and a beta particle. 2. Write the isotope symbol for carbon-14. 3. Carbon has two stable isotopes, C-13 and C-12. a. Which of these two is the more abundant isotope? Explain. b. What do neutral atoms of these two isotopes have in common with a neutral atom of C-14 and how do they differ? 4. Determine the products of carbon-14 decay. It releases a beta particle in the process of decay. 5. The half-life of carbon-14 is 5730 years. If we assume the footprints at the youngest are 21,000 years, how many half-lives did the sample of atoms go through? Your answer should be one place past the decimal. Show your work.
REPRESENTATION OF MATTER In the following question, you will represent matter on macroscopic, molecular/atomic, and symbolic levels for a specific chemical reaction. Post-1983 pennies have a thin coating of copper metal over a zinc core. When the copper metal is filed, the zinc metal is exposed. When the penny is dropped into 6M hydrochloric acid (HCI), only the interior zinc metal reacts. 1. Write the balanced chemical equation for Zn reacting with the HCl to form aqueous zinc chloride and hydrogen gas. Make sure to include the states of matter for each reaction. 2. Record what you would observe in the macroscopic experiment and explain how you decided. 3. Does this reaction contribute a greenhouse gas to the atmosphere? Explain. 4. If you wanted to dissolve all of the zinc inside a penny, how many moles of HCl are needed. Newer pennies have an average mass of 2.5 g and are 97.5% Zn by mass. Show your work.
5. Using the amount of moles of HCl calculated from 4, and the molarity of HCI is 6.0 M, how many mL do you need to dissolve that penny. Show your work. 6. Draw the particulate level diagram for the reaction. A single circle is considered one atom. Use different colors or patterns for different elements. You should include enough circles to indicate that a chemical change is occurring. Make sure that your diagram resembles the type of compound each is and keeping in mind the reaction is taking place in an aqueous solution Reactants Products