Description A sample of ethane, C2H6?is found to contain 3.00 x 1022?atoms of H. How many molecules of?C2H6?are present?? Calculate the molar mass of menthol, C10H20O. 20.0 g Na2CO3?has how many moles of Na+\ 15.0g Al(NO3)3?has how many NO3-? Determine the number of moles of aluminum in 96.7 g of Al. 8.00 g of C6H6?has how many H atoms? 15.0 g NH3?has how many moles of H atoms?? The mass of 1.21?x 1020?atoms of sulfur is How many Nitrogen atoms are present in 1.0 x 109?molecules of Aspartame,??C14H18N2O5. Consider the reaction: 3H2?+ N2?--> 2NH3. If a mixture of 3.0 mole of H2?and 3.0 mole N2?is taken,?how many moles of excess reactant remain unused? A compound of Boron & Oxygen has 31.05% B and 68.95% O. What is its empirical formula?? Consider the reaction: 2H2?+ O2?--> 2H2O. If a mixture of 1.0 mole of H2?and 1.0 mole O2?is taken, how many?grams?of H2O can form?? What is the?coefficient of N2?when the following equation is properly balanced with the?smallest?set of?whole numbers? ?_____N2H4+ _____N2O4?à ?___?__N2+ _____ H2O? Balance the following equation using the smallest possible integers and determine?the coefficient of HCl?? Fe2S3?+ HCl --> FeCl3?+ H2S The fermentation of glucose C6H12O6?produces?ethanol, C2H5OH and CO2.The equation for the reaction is as follows:?C6H12O6 -->?2C2H5OH??+?2CO2.? How many moles of CO2?are produced when 0.400 moles of C6H12O6?are used? The fermentation of glucose C6H12O6?produces?ethanol, C2H5OH and CO2.The equation for the reaction is as follows:?C6H12O6 -->?2C2H5OH??+?2CO2.? How many grams of?C2H5OH??are produced when 0.400 moles of C6H12O6?are used? When balanced with smallest set of whole numbers, the coefficient of O2?in the following equation is __ C3H5OH+ __ O2?-->?__ CO2?+ __ H2O Which of the following is not correct? Select one: a.?1mol of Cl2?has 35.45 g Cl b.?1mol of NaCl has 6.022 x 1023?Na+ c.?1 mole of Ca3N2?has 3 moles Ca+2 d.?1 mol of O3?has 1.81 x 1024?O atoms
Description Need top grade for this lab https://www.sascurriculumpathways.com/portal/Launch?id=1194 ALL LABS REQUIRE A COMPLETE AND PROPERLY FORMATTED LAB REPORT (SEE DOCUMENT ATTACHED); ANY ASSIGNMENT THAT DOES NOT HAVE A LAB REPORT WILL BE GIVEN A FAILING GRADE. A SAMPLE REPORT FORMAT CAN BE FOUND IN THE BLUE BOX IN THE TOP RIGHT CORNER OF THE PAGE. Complete this Virtual Lab by interacting with the online Simulation. Answer the Virtual Lab Questions in complete sentences to demonstrate your learning. Submit your answers in a word document.
Description After learning about Molecular Geometry, VSEPR Theory, and hybridization demonstrate your knowledge of these concepts: Draw the Lewis structure and predict the molecular geometry of the following molecules: a. SO2 b. CI4 c. BCl3
Description answer each of these questions depending on the experiment attached: 1.What questions will be answered with the results obtained from this experiment? 2.What kinds of selective precipitation will be used to detect the presence of metal cations? What kind of selective precipitation will be used to detect the presence of anions? 3.What is the main question this experiments seeks to answer? 4.What is the best way to insure that there are no false positives or that there is not contamination or interference from unwanted ions in the solution? 5.How is selective precipitation specifically used to identify unknown ions in this experiment? 6.What technique is used to separate precipitate from the ions that remain dissolved in the solution? What techniques are used to treat the precipitates for additional analyses? 7.Discuss the importance of selective precipitation. 8.What results will be collected and recorded in your lab notebook? 9.What can be expected if the ions are correctly identified? What are some things that might prevent the ions from being correctly identified? 10.What is this experiment designed to measure?What will the results NOT tell us about the experiment? 11.What special safety precautions do you need to be aware of for this experiment?
Description When you refer to something as being in the “background,” you may mean it is something that goes unnoticed.Have you ever heard of the term background radiation? You have been asked by the local paper to write a column explaining background radiation to the members of your community. In your article, be sure to address the following questions: What is background radiation? What are the major sources of background radiation? How is background radiation measured? What are two elements that produce background radiation on earth and what do their decay equations look like? What dangers does background radiation pose to humans? Do certain areas of the country have higher levels of background radiation than others? If so, identify these areas and compare the background radiation levels. *The time limit is 1 day, but I'd really like this assignment sooner than that*
Description Use the interactive to explore the particle-level behavior of solids, liquids, and gases according to kinetic molecular theory. As you explore, compare the motions and arrangements of particles in each phase. Interactive can be found here: http://keystonenhs.blackboard.com/webapps/blackboard/content/contentWrapper.jsp?content_id=_8551400_1&displayName=8.01+WebQuest%3A+Solids%2C+Liquids%2C+and+Gases&course_id=_19505023_1&navItem=content&href=https%3A%2F%2Fstatic.k12.com%2Feli%2Fbb%2F338%2F2_23711%2F1_44479_2_23713%2F53639c24774ad950bdc12ee95b79ceb30a2a2794%2Fpage_1.html&cR2XilcGYOo=ttYqx1nYJ9DjbuzYE4pHB5x6wKj4%2BI94Ft2fQAUAacQ%3D The WebQuest guide with the questions that need to be filled out is attached. *The time limit is 1 day but I'd really like to get this sooner than that*
Description First, procure the materials from the list below. These should be relatively easy to find at your local pharmacy or drugstore. Then, study the objectives and consider the essential questions to prepare yourself to begin. Follow the procedure closely. Take notes of your observations and questions as you move through the experiment. At the conclusion of your experiment, answer the Analysis questions. Be thorough as you respond to these important questions - your overall Analysis Portion should be three to four pages in length (750-1000 words). Materials for the project: • pH litmus paper (pH testing strips) • Variety of solutions (lemon juice, vinegar, water, tea, milk, soap, baking soda) • Goggles (Safety Precautions) **Students must wear goggles! • Do not taste or directly inhale any of the solutions. Procedure 1. Choose 5 different substances to test. 2. Hypothesize whether each substance is an acid or a base. Record on the table below. 3. Put each substance in a test well. If it is a liquid, test the liquid directly. If it is a solid, it needs to be mixed with water so the pH can be determined. 4. Dip a pH strip into each of the 5 substances and allow it to sit for 10-20 seconds. Using the pH scale on the pH strip container, measure the pH level and record it on the chart. Part I: Essential Questions 1. What is the pH scale? 2. How are acids and bases measured by a pH indicator? 3. How are acids and bases different? 4. What types of substances are considered acids and bases? Part II: Data Table: Measurement of pH Name of Substance(at least 5) Hypothesis (is it an acid or a base?)(at least 5) pH Level(at least 5) Acid, base or neutral? (atleast 5) Part III: Analysis questions: 1. What does the pH scale indicate? 2. What is an acid? Where are they found on the pH scale? What is a base? Where are they found on the pH scale? 3. Were any substances tested neutral? Why or why not? Explain your answer. 5. Were any of your results surprising? Why or why not? 6. Write five facts you learned about acids and bases.
Description For similar light intensity, compact fluorescent bulbs use about 25% of the energy of an incandescent bulb. Let's say you replaced a bulb of 100 W with a fluorescent bulb and that your utility charges $0.15/kW-hour. How many dollars would you save in electricity in the 10,000-hour lifetime of the bulb?
