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За. Bromine and methanoic acid react in aqueous solution. Br, (aq) + HCO0Н (ад) — 2Br (aq) + 2H" (аq) + Со, (g) The reaction was monitored by measuring the volume of carbon dioxide produced as time progressed. o 5 10 15 20 25 [Source: © International Baccalaureate Organization 2019] 30 20 40 60 80 100 120 140 160 Time / s [Source: © International Baccalaureate Organization 2019] Determine from the graph the rate of reaction at 20 s, in cm³ s1, showing your working. 3b. Outline, with a reason, another property that could be monitored to measure the rate of this reaction. 3c. Describe one systematic error associated with the use of the gas syringe, and how the error affects the calculated rate. 3d. Identify one error associated with the use of an accurate stopwatch. Volume of carbon dioxide / cm T m mm mo

As temperature decreases, which takes precedence? Energy dispersal or positional randomness

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MULTIPLE CHOICE Question 18 Which scenario best describes the long-term health effect of air pollution exposure? A woman exposed to toxic chemicals in ground-level air pollution experiences a change in DNA, resulting in lung cancer. B. A man exposed to toxic chemicals in ground-level air pollution experiences extreme eye irritation that clouds his vision. A man exposed to toxic chemicals in ground-level air pollution experiences a cough. D. A woman exposed to toxic chemicals in ground-level air pollution experiences an ex- treme headache.

Concentration (mol L-¹) COCH₂(g) Cl₂(g) + CO(g) AH = + 108 kJ 0.14 0.12- 0.10- 0.08- 0.06 0.04 0.02- 0.00+ 2 minutes 4 minutes 14 minutes 0 2 4 6 10 minutes Cl₂ Match each stress that occurred at each time using the graph CO COCI₂ 8 10 12 14 16 18 Time (min) 1. Temperature Increase 2. Pressure Increase 3. Temperature decrease 4. Remove Chlorine gas 5. Add carbon monoxide 6. Pressure decrease 7. At equilibrium 8. Remove carbon monoxide

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 -

Rsimi, Nour 2023VVA Chemistry.7b.FA1 An unknown solid substance is heated according to the temperature versus time graph below. Temperature (°C) 70 40 30 20 288 8 2 0 0 5 15 Time (min) 20 00 4 of 5 1 2 3 4 5 25 While the substance is a liquid, at what temperature do the molecules of the substance have the greatest average kinetic energy? 2 % 3 4 5 16 7 8 insert

List the requested biological classification or organic functional group(s) for the reactant, predict the reaction type, and predict the product(s) classification or functional group(s). Use the information to draw the major product(s)

Fill in the missing information. OH Н+ НО OH m-CPBA ОН Br H2 Pd/C 1. NaBH4 2. H,0+

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Importance of Chemistry in Human Life؟

This module discusses the characteristics of carbohydrates, fats, and proteins. Enzymes are a special class of proteins that perform a wide variety of functions essential for the well-being of a living organism. In humans, a class of enzymes, which is of particular interest, are the liver enzymes. They break down all toxins encountered by humans. Research and describe the underlying causes for the elevated levels of any one of the liver enzymes described in a liver function test.Ask ONE (1) clarifying question about a topic you find difficult or want to learn more about from the concepts introduced in this module.In your response to your peer’s posts, locate a resource that may help address the clarifying question regarding the genetic topic in the initial post.

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CD Page view O₂N A Read aloud 1015MSC Chemistry of Biological Systems II 2020 OH TAdd text Dra

rsity o... ingsbo... kboard... ARED4 ethod? 7... F2 Remaining Time: 1 hour, 22 minutes, 23 seconds. Question Completion Status: A Moving to the next question prevents changes to this answer. Question 1 # The angle of the water molecule (H₂O) is 180 degrees 120 degrees 100 degrees 90 degrees 109 degree A Moving to the next question prevents changes to this answer. MAR 14 80 F3 SA $ 000 F4 tv % F5 NA MacBook Air 22 F6 ∞r F7 45.113

The Ksp of Fe(OH)3(s) is 3  ×10-39.  What concentration of Fe3+ can exist in pure water? A. 3  ×10-4 M B. 1 ×10-10 M C. 3  ×10-21 M D. 3  × 10-24 M E. 3  × 10-30 M

these  both imagess are  linked. I need answers from 11 to 15

A1L TPN order is written for 400 mL 10% Dextrose, 300 mL 4.25% amino acids, and a total of 37 mL of additives. How much sterile water for injection should be added? a. 55 mL b. 137 mL c. 163 mL d. 263 mL

Help Explain one effective or ineffective aspect of this graph.