Chem 115 Activity 7(1)

Dangerous Paint Stripper Jessica has a summer job working for the city parks program. She has been using a cleaner called “Graffiti Gone” to remove graffiti from the bathrooms. She has to take a lot of breaks, because the chemical makes her throat burn. It also makes her feel dizzy sometimes, especially when the bathrooms don’t have very many windows. On the label, she sees that the cleaner has methylene chloride in it. She feels like she’s managing to get the work done, but she is worried about feeling dizzy. She wants to find out more about this chemical, what harm it can cause, and whether there are safer ways to do this work. Questions for following story. 1. What went right in this situation? 2. What went wrong in this situation? 3. What steps should be taken in this workplace to make sure employees are better protected and prepared the next time?

(a) The population of a large city grows very quickly for several years. Then the growth begins to slow, and the population remains constant for several years. After this, the population grows again, but slower than before. Population Population Population Population Time Time Time Time

Chapter 13 is a Homework question. question 47. Please explain how can I do it without graphing it because if this question comes on the test how can I quickly solve this question without any graph and do it mathematically? If possible can you make a video? Thank you.

Answer question 1 please

The following are some of the steps in the Born-Haber cycle for Mg (s) + Br2 (l) →  MgBr2(s).  Check all of the reactions that you would expect to be exothermic.       Mg (s) → Mg (g)     Mg2+(g) + 2 Br- (g) → MgBr2 (s)     Br (g) + e → Br- (g)     Mg (g) → Mg+(g) + e     Mg+ (g) → Mg2+(g) + e

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Order from smallest to greatest

B. Rates of reaction are typically measured as the change of concentration per unit time. Some typical units of concentration are: M, mM, pM, µM, nM. Some typical units of time are: years, days, hr, s, ms, ps, µs, and ns. For each reaction, suggest a reasonable unit of measure for the rate of reaction. a. The combustion of gasoline. b. The transformation of organic material into crude oil. Chemical change involved with memory in the human brain. с. d. The rusting of an iron nail. 9. Why would a scientist use nM/ps instead of M/s? - 112 -

adds-up to 100. You may use the periodic table previously provided, a calulator and clean scrap paper. Timed Test This test has a time limit of 2 hours.This test will save and submit automatically when the time expires. Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain. Multiple Attempts Not allowed. This test can only be taken once. Force Once started, this test must be completed in one sitting. Do not leave the test before clicking Save and Submit. Completion Your answers are saved automatically. Remaining Time: 1 hour, 58 minutes, 38 seconds. * Question Completion Status: A Moving to another question will save this response. Question 4 A sodium chloride solution is 38% NaCl by mass and has a density of 1.12 g.ml, determine: The Molarity of the solution The molality of the solution The mole fraction of water A Moving to another question will save this response.

Has 2 subtleparts ( A&B) . not graded everything is given

Name (please print): Fall 2022 Basic Laboratory Operations Post Lab Questions 1.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the mass and then several minutes later you measure the volume of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.] 3.) You're attempting to calculate the density of an alloy. The alloy is in the shape of a cylinder. If the mass of the alloy is…

MISSED THIS? Read Section 15.5 (Pages 650 - 656) . Part A Which of these two reactions would you expect to have the smaller orientation factor? a. O(g) + N2(g) → NO(g) + N(g) b. NO(g) + Cl2(g) → NOCI(g) + Cl(g) Complete the sentences to explain your answer. Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help symmetrical Unlike in Yeaction (b), both reactants in reaction (a) are This makes NO(g) + Cl2 (g) → NOCI(g) + Cl(g) orientation in reaction (a) important. asymmetrical The reaction with the smaller orientation factor is expected to be O(g) + N2(g) → NO(g) + N(g) less more Submit Request Answer Provide Feedback

You wish to carry out an investigation that involves the use of a CONDUCTIVITY METER to monitor the rate of a chemical reaction. Which of the reactions below would be the LEAST suitable for this? Select one: a. Ba2+(aq) + SO42-(aq)  → BaSO4(s) b. S2O32-(aq) + 2H+(aq) → SO2(g) + S(s) + H2O(l) c. POCl3(l) + 3H2O(l) → 4H+(aq) + 3Cl-(aq) + H2PO4-(aq) d. 2H2O2(aq) → 2H2O(l) + O2(g)

student found a bottle of unknown origin in the basement of an "CAUTION—contains С₁H₁O.” No other A old house. The bottle was labelled information was given, but inside the bottle were some white crystals. The student took the bottle to a chemistry laboratory, where she analyzed the crystals with the help of the laboratory staff. C₁2H₁6O reacted with Br₂ in CCl4 adding one mole of Br, and forming C₁₂H₁OB2₂. When a sample of C₁₂H₂O was reacted with O3 followed by Zn/H₂O, two different samples, J and K, were obtained. Compound J had a molecular formula of C.HgO₂, and its NMR is shown below. Compound K had a molecular formula of C₂H₂O, and it could be oxidized to compound L, with a molecular formula of C₂H₂O₂. The IR spectrum of L showed a very wide, strong band centred around 3000 cm*¹. The NMR spectrum of L showed only two different absorptions: a doublet (6H) at 0.9 ppm and a septet (1H) at 3.6 ppm. There was also a singlet (1H) off the scale at 11.8 ppm. students, deduce possible…

The average time for oxygen molecules to diffuse 0.5 mm is 20 seconds. How long would it take for oxygen molecules to diffuse 1.0 mm? A. 40 s B. 14 s C. 80 s D. 30s

Why do you think certain types of radiation are able to break the bonds in ozone (O3) but not oxygen (O2)?      (3-6 sentences)