Module 2 Quiz

Experiment 4: Preparation and Properties of Hydrogen and Oxygen Gases Toriana Mieer -Jones Name: Section: Lab Instructor: L/26 Date: Pre-Lab Exercise 4 1. In this experiment, simple chemical reactions are used to generate small quantities of hydrogen and oxygen gases. These methods would be too expensive and too complicated if large quantities of these gases were needed, however. Use your textbook, a chemical encyclopedia, or an online source to look up the major industrial methods of preparing very large quantities of these gases. Summarize your findings here. ono od te led bateono to n

31D 15 undo 'H → 32P+ ? 15 Express your answer as a particle. ? OA chemical reaction does not occur for this question.

..1.. 4.. . I6 Il 7 Scenario 2 The airbags in vehicles contain a mixture of NaN,, KNO, and SiO, When a car decelerates at a rapid pace, an electrical signal goes to the gas generator inside the airbag, triggering a series of three chemical reactions: 10NAN. 10NA +2KNỎ, K,O + Na,0 + Na + SiO, - K,SiO, 10NA + 15N,(g) KO + 5Na O + N,(g) These reactions produce gas (N.) to fill the airbag and convert sodium azide (NaN,), a highly toxic substance, to alkaline silicate (K,SiO ). The quantity of NaN, must be carefully calculated to ensure that the volume of gas is adequate to fill the airbag firmly enough to protect the passenger but not overfill and cause the bag to explode. A standard airbag needs 67 L of N, (g) to properly inflate. notes

Which one is it?

3) Carbon-14 is constantly being produced in the upper atmosphere, and the amount is in equilibrium. As long as an organism is alive, it keeps its carbon isotopes in balance with the atmosphere, but at soon as it dies, it stops taking up new 14C, and so the geologic clock starts. You found a shell buried in sedimentary layers, which has 6% of its original 14C left. Determine the age of the shell. Show your work.

It is found that 2.0 x 10-5 mol 222Rn (t/2 = 3.82 d, atom mass = 222) has seeped into a closed %3D %3D basement with a volume of 2.0 x 103 m3. How many atoms of 222Rn will remain after 24 hours? A. 2.5 x 1018 B. 1.0 x 1019 C. 8.5 x 1018 D. 4.3 x 1020

Y Brigham Young Univers x Y Practice Sheet 16 Digital Resources for C Y Topic: Discussion 8: The x b My Questions | bartleby x + Smartwork5 A digital.wwnorton.com/130716 Determine AH for the decomposition of the following reaction: rxn 2NOC1(g) N,(g) +0,(g) + Cl,(g) AHrxn kJ 103 5:09 PM P Type here to search 99+ O G 4») 10/31/2020 近

omework Chapter X OWLV2 | Online teaching and le X keAssignment/takeCovalentActivity.do?locator=assignment-take [Review Topics] [References] Some Radioactive Isotopes Useful in Medical Imaging Mode of Isotope Decay Half-life Use in Medical Imaging B+, Y B+, Y Brain scan to trace glucose metabolism Brain scan to trace glucose metabolism Detect eye tumors Diagnose albinism, image the spleen and gastrointestinal tract Bone marrow function, diagnose anemias Whole-body scan for tumors Pancreas scan Lung ventilation scan Scan for bone diseases, including cancer Brain, liver, kidney, bone scans; diagnosis of damaged heart muscle Diagnosis of thyroid malfunction Kidney scan Heart scan and exercise stress test 20.3 m Carbon-11 Fluorine-18 Phosphorus-32 Chromium-51 Iron-59 Gallium-67 Selenium-75 F 109 m. 14.3 d E.C., Y Cr SFe SGa Se 27.7 d B, Y E.C., y E.C., y 44.5 d 26 78.3 h 750 118 d Krypton-81m Strontium-81 Technetium-99m Iodine-131 13.3 s 36Ar 81ST 38 22.2 m 99m 6.01 h 8.04 d 53 197 80 20…

dNuclear Processess [Review Topics] [References] Use the References to access important values if needed for this question. Carbon-14 is used in radiocarbon dating. The half-life of carbon-14 is 5.73 × 10° years. How many milligrams of a 81.5 milligram sample of carbon-14 will be lost by radioactive decay during 1.15 x 10% years? mg Submit Answer Retry Entire Group 9 more group attempts remaining Previous Next Save and Cengage Learning | Cengage Technical Support

Scientists can determine the age of ancient objects by the method of radiocarbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to radioactive isotope of carbon, 14C, with a half-life of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14C through food chains. When a plant or animal dies, it stops replacing its carbon and the amount of ¹4C begins to decrease through radioactive decay. Therefore the level of radioactivity must also decay exponentially. A parchment fragment was discovered that had about 74% as much 14C radioactivity as does plant material on earth today. Estimate the age of the parchment. (Round your answer to the nearest whole number.) yr Need Help? Watch It Additional Materials eBook

The COVID-19 pandemic forced many people to work from home for extended periods. During these periods, many cities reported unusually low levels of smog. Suggest an explanation for this observation.

Strontium-90 is a radioactive byproduct of nuclear reactors (and nuclear weapons) that behaves biologically much like calcium (also in Group II on the periodic table). Consequentially, it can accumulate in the milk of mammals and then into the bone when ingested. This is a particular concern when children ingest milk in significant amounts that has been contaminated by 90Sr. The public first became aware of this potential threat decades ago when the United States was involved in atmospheric atomic bomb testing; one of the major concerns about health impacts of nuclear tests regarded public exposure related to the intake of 90Sr in contaminated milk. By what type of nuclear process (reaction) is it formed from U-235? First, write a reaction showing this, assuming that the reaction was initiated by an energetic neutron colliding with the uranium nucleus and resulted in the formation of a Sr-90 nuclide plus three additional neutrons, plus some other product (see fig). Next, write two…

Write balanced equations for each of the processes described below. (Use the lowest possible coefficients. Omit states-of-matter.) (a) Chromium-51, which targets the spleen and is used as a tracer in studies of red blood cells, decays by electron capture. Help chemPad XXº (b) Iodine-131, used to treat hyperactive thyroid glands, decays by producing a ß particle. Help chemPad XX→→ Greek chemPad X₁X² → Greek (c) Phosphorus-32, which accumulates in the liver, decays by ß-particle production. Help Greek

. Let's apply the results of Problem 2 to potassium-argon dating frequently used to date sedimentary rocks. Potassium-40 decays by two different paths: electron emission electron capture where conversion to Ca occurs 89.1% of the time, and to Ar 10.9% of the time. The overall half-life for the decay of potassium-40 is 1.248 × 10⁹ years. Estimate the age of sedimentary rocks with an argon-40 to potassium-40 ratio of 1.02 %. 40 19K 140 Ca 40K 240 Ar 19 18-

How long will it take for 98.6% of a sample of 18879 Au to decompose (t1/2 = 8.8 mins)?

You will research how the energy is extracted or produced and try to be very detailed about the process and the chemistry involved (stating equations and reactions). You will also research the impact on the environment when using or producing fuels. Investigating fossil fuel: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words Investigating nuclear energy: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words Investigating biofuel: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words

Number 2

Im studying chem2124 Chapter 6. what does the q means and how do you solve this equation: a. q=-47 kJ, w=+88 kJ b. q= +82 kJ, w = -47 kJ c. q = + 47 kJ w= 0 In which of these cases do the surroundings do work on the system