Unit V Journal

A large population of Japanese beetles infests a plot of cropland. In response to the infesta tion, farmers treat the land with organochlorine pesticides. As a result of the treatment, the population of Japanese beetles is eradicated within the cropland, along with the popula- tions of multiple other insect species. Which of the following statements explains the most likely reason for the death of so many insect populations? Organochlorine pesticides are persistent organic pollutants that interfere with the respi- ratory system of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the growth hor- mones of the insect populations. Organochlorine pesticides are persistent organic pollutants and interfere with the re- productive organs of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the transmission of nerve impulses, resulting in spasms, seizures, and death of the insect populations.

DDT (molar mass = This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds towards extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. 8.66 x 10-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41 x 10-7 M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a first-order process with a half-life of 56.0 days. Time =|| days

Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog, identify it. NO 2 B c) Unsaturated hydrocarbon sO 2.

What is the role of carbon dioxide in air in Fresco Painting? What type of catalytic mechanism (heterogenous or homogenous) exist in Fresco painting? Why?

Part A) For the reaction below, what volume of oxygen gas reacts with 20.0 mL of hydrogen chloride? (Assume temperature and pressure remain constant)             4HCl(g) +   O2(g)--> 2Cl2(g) + 2H2O(g) A) 20.0 mL B) 10.0 mL C) 5.00 mL D) 40.0 mL E) none of the above Part B)  For an experiment, the decomposition of 1.500 g of baking soda gave 0.300 L of carbon dioxide gas. If the calculated volume of carbon dioxide gas is 0.310 L, what is the percent yield? A) 40.0% B) 96.8% C) 103.3% D) 75.0% E) 20.6% Part C) Based on the limiting reactant concept, how many moles of cobalt(III) oxide are produced from the reaction of 2.00 mol of cobalt and 2.00 mol of oxygen gas?             4 Co(s) + 3 O2(g)-->  2 Co2O3(s) A) 2.00 mol B) 1.33 mol C) 0.50 mol D) 1.00 mol E) none of the above

DDT (molar mass % 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds toward extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 8.75 X 10-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41 X 10-7 M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a frst-order process with a half-life of 56.0 days.

My quiz timed out and I was unable to answer the first question in time. I was also unable to answer the second correctly. This concept confuses me quite a lot and I'm not sure how to solve it in a step-by step process

For each scenario below, describe: (a) How could they have been prevented. (b) What should be the appropriate response to minimize harm. During a chemistry experiment, Jude carefully pours an unknown solution from a test tube into a beaker. His groupmate, John surprises him from behind. Jude accidentally drops the beaker and glass pieces caught his sandaled foot.

16) HNO, H;SO,(catalyst) NH2

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

A vehicle manufacturing company forms a plan to begin the production of vehicles with catalytic converters. Which is the best description of the regulation or program the company is trying to accommodate? A an effort set in place to stop public school bus drivers from running the engine when the vehicle is not in motion an effort set in place to allow the EPA to regulate emissions from motor vehicles in the United States C. an effort set in place to ensure that vehicles in the United States have an air pollution control device an effort set in place to encourage the manufacture of vehicles that have no emission control systems and no emissions from gasoline

Can someone please help? The question is:

Combustion reactions occur when any substance is burned. Research a particular combustion reaction and use any form of media that that explains the reaction itself, what happens when oxygen levels are limited, and the impact of this incomplete combustion.

Does the diagram show exothermic or endothermic reaction