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- You have two distinct gaseous compounds made from element X and element Y. The mass percents are as follows: Compound I: 30.43% X, 69.57% Y Compound II: 63.64% X, 36.36% Y In their natural standard states, element X and element Y exist as gases. (Monatomic? Diatomic? Triatomic? That is for you to determine.) When you react gas X with gas Y to make the products, you get the following data (all at the same pressure and temperature): 1. volume gas X + 2 volumes gas Y2 volumes compound I 2. volumes gas X + 1 volume gas Y2 volumes compound II Assume the simplest possible formulas for reactants and products in the chemical equations above. Then, determine the relative atomic masses of element X and element Y.Marie Curie was born in Poland but studied and carried out her research in Paris. In 1903, she shared the Nobel Prize in Physics with H. Becquerel and her husband Pierre for their discovery of radioactivity. (In 1911 she received the Nobel Prize in Chemistry for the discovery of two new chemical elements, radium and polonium, the latter named for her homeland, Poland.) They and others observed that a radioactive substance could emit three types of radiation: alpha (), beta (), and gamma (). If the radiation from a radioactive source is passed between electrically charged plates, some particles are attached to the positive plate, some to the negative plate, and others feel no attraction. Which particles are positively charged, which are negatively charged, and which have no charge? Of the two charged particles, which has the most mass? Radioactivity. Alpha (), beta I(), and gamma () rays from a radioactive element are separated by passing them between electrically charged plates.State whether the following is a hypothesis, theory, or law of science. Global climate change is occurring because of human-generated carbon dioxide Explain.
- Hydrogen gas is prepared in a lab experiment. In this experiment, 18.00 g of aluminum metal are mixed with 25 mL of HCl (d=1.025g/cm3). After the experiment, there are 12.00 g of aluminum and 30.95 g of a solution made up of water, aluminum ions, and chloride ions. Assuming no loss of products, how many liters of H2 gas are obtained? The density of hydrogen gas at the temperature and pressure of the experiment is 0.0824 g/L.The density of aluminum is 2.7 g/cm3; that of silicon is 2.3 g/cm3. Explain why Si has the lower density even though it has heavier atoms.1PrqdNDx-hBYyzKo-xfiM9-Jlq7EAaWe3GBt t3U3jDo/edit ulator O A Land of Permane... it was seconds ago - UA E- EE 2 Al + 3 H,SO, 6. How many grams of hydrogen gas are produced with 0.S8 moles of aluminum sulfate? 3 H, + Al,(SO); 0.88 moles Al (SO), 3 moles H. 6 g H. 0.88 moles Al (SO), 1 mole H.
- X + ce/acellus_engine.html?ClassID=112101524 What is the estimated average atomic mass for this element? A. less than 86 amu C. exactly 88 amu D BI nternational Academy of Science. All Rights Reserved. Relative Abundance 100₁ 50- Unknown Element 81 83 85 87 89 Mass (M/e) B. 87-88 amu D. more than 88 amu Enterge-R x 21/FA-CHM-121-08 General Che * OWLv2 | Online teaching and lea G how to find mass percent - Goo x + mengagenow.com/ilm/takeAssignment/takeCovalentActivity.do?locator=assignment-take A sample of gas mixture from a neon sign contains 5.12 x 10 mol Ne and 4.40 × 10¬4 mol Kr. What are the mass percentages of Ne and Kr in the gas mixture? Mass percentages of Ne = Mass percentages of Kr = Submit Answer Try Another Version 6 item attempts remaining58. Apply Graph mass versus volume for the data given in the table.What is the N, 20.95% O 0234 Ar and 0.04% CO, and other gases. 51. infer from Figure 17 how long the ozone hole lasts. 58. Apply Graph mass versus volume for the data given in the table wi slope of the line? 7.5 12 15 22 Volume (cm³) Mass (g) 24.1 38.5 48.0 70.1
- - CHEM A054 520 2 X Chapter 9 part 2 Homework i 9 1 points 8 ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launch Url=https%253A%252F%252Fclasses.alaska. 00:25:53 eBook Hint Print References Mc Graw Hill D Question 9 - Chapter 9 part 2 X 2 F2 Determine the mass of RbNO3 necessary to prepare 500.0 mL of a solution that is 0.228 M RbNO3. g RbNO3 3 80 F3 + $ 4 000 000 F4 er 5° % 5 F5 8 DII 9AME M Inbox (1,600)-fantil@udeledu X Mail- Francesca A Tantillo-Out x Homepage - CHM150-251 Chen X + → Capp.101edu.co < A Z 89'1 Rain coming 2 S # 3 E D C Uranium hexafluoride, UF, is an important compound used in the enrichment of uranium by gaseous diffusion. $ Which of the following best describes where fluorine can be found on the periodic table? 4 40 R % F 5 B) Noble gases A) Alkaline earth metals C) Lanthanides D) Actinides E) Halogens G O Question 19.b of 23 6 B Aktiv Chemistry OME V Y H * الات & 7 -0✓ INN N PrtScn * 8 J Home End o M ( O 9 K O ) 0 L Alt Pgup m P Pon 12 B ? □ ( 4D Update ***/***/// 512 PM D 7/6/2022 < X Submit Del Backspace Enter Shift1.Methane was combusted at 100.0 degrees C and 1.00 atm. The following data table was used to collect and record data: Item Mass Before (g) Mass After (g) Volume (L) Methane 774 x x Oxygen XS x x Carbon dioxide x ? ? Water Vapor x ? ? CH4 + O2 ---> How many grams of water vapor is formed as a result of the reaction? How many liters of carbon dioxide is formed? _______g H2O _______ L CO2 Blank 1: Blank 2: