Chemistry

Are biopolymers viable alternatives to replace traditional plastic

How does the shape of an ice cube affect how quickly it melts?

SOLVE these two word problems, and show all work 3. The activation energy of a forward reaction is 146.8 KJ and the ?H = 54.2 KJ. Draw an energy profile diagram for this reaction and (i) calculate the activation energy of the reverse reaction, (ii) show the effect of a catalyst on the diagram. 6. The activation energy of a reaction is 56.8 KJ and the ?H = -24.2 KJ. Draw an energy profile diagram for this reaction and (i) calculate the activation energy of the reverse reaction, (ii) show the effect of a catalyst on the diagram.

There is a long history of the use of medicinal plants to treat specific medical conditions. Many early medicines fall into the category of nitrogen-containing plant products called alkaloids. Ephedrine is an alkaloid which was originally extracted and purified from Ephedra sinica (ma huang) plant. Ephedrine is used for temporary relief of shortness of breath, chest tightness, and wheezing due to bronchial asthma. This biologically active compound has basic amine on its structure and the isolation/purification procedures relay on liquid-liquid extraction with sequential basic and acidic aqueous solutions and finally crystallization of the final compound. Please research and write a procedure (no longer than a page) for a student who use your procedure and be able to purify this compound. Also, write the reaction equation (or using a chart that show reaction of acid and base) for each step of extraction.

A very important part of any scientific discipline is being able to communicate technical information in a clear, concise, and academically rigorous manner. This includes being able to research information that is relevant to a topic and write about what you learned in a way that is easily understood by a wide variety of readers. In this assignment you will describe a chemical reaction that you personally routinely encounter. Examples would include reactions that occur during cleaning, in the garden, are health and beauty related, are related to your car, to hobbies, or even reactions that occur within the body. Just choose a topic that interests you! Since this assignment is focused on being able to communicate a scientific process properly and clearly, the format can be either APA style or MLA style. Purdue Owl is a great resource for either one of these two styles. Your essay should also be: ?  3-5pagesinlength ?  Doublespaced(2.0spacingoption) ?  ContainproperEnglish,spelling,andgrammar ?  Have both proper in text citations and a work cited page ?  Savedaseithera.docor.docxfile You will need to use the internet to gather information on the reaction of your choice. There is a minimum requirement of 3 scholarly sources (Wikipedia is not a scholarly source), either primary or secondary is fine. If you need help understanding what qualifies as an acceptable primary or secondary source, feel free to use the resource below. ? ResearchandCitationResources This essay is intended to allow you practice for communicating factual scientific information, so personal opinions and emotional appeals should not be included. It is okay to include your own relation and interest to the topic, but beyond that it should just be communicating what is going on and why. Suggestedoutline: ? Introduction ? Body Paragraphs:address what the reactants are, what the products are (show a balanced chemical equation), describe the reaction mechanism, whether it is an acid- base or oxidation-reduction reaction, what conditions this reaction occurs under (temperature, pressure, solvent, concentration, catalysts, light/dark), whether it is endothermic or exothermic, how the reaction is used, and how often it is used. ? Conclusion ? Workcitedpage

Two aqueous solutions are combined in a beaker. One solution contains 300.0 grams of potassium phosphate and the other contains 300.0 grams of calcium nitrate. 1. (2 Points). Write the balanced chemical equation for the reaction.2. (2 Points). What type of chemical reaction is involved? 3. (20 Points). What mass of each of the following substances is present when the reaction stops? (Show work).A. Potassium phosphateB. Calcium nitrateC. Calcium phosphateD. Potassium nitrate 4. (2 Points).Which reactant is limiting? (Use complete sentences)5. (3 Points). Which reactant is in excess, and by how much? (Use complete sentences)6. (3 Points). Which product precipitated and which product remained in solution? (Use complete sentences)7. (3 Points). Assume that 150.0 grams of your product were produced in the laboratory, calculate the percentage yield?8. (5 Points). Summarize in writing, using complete sentences, the chemical principles used to arrive at your conclusions.

Write 5 correct, distinct, and relevant statements about the following question. Remember that your goal is not necessarily to solve the problem, but to brainstorm relevant information needed to solve it. What is the pH when 5.3 g of sodium acetate is dissolved in 100.0 mL of water? Topic #2 Compare and contrast the definitions for acids and bases. Rather than simply writing their definitions, highlight what they have in common and what makes each unique from the others.

– An introduction of the element including the physical properties associated with it, where it is found, and any other relevant periodic information.- History of the element, discovery information, etc. – Common uses of the element and it’s economical importance/ value if applicable –  At least 4 sources, 1 from a JOURNAL and 1 from a PUBLISHED WORK

In a minimum of a 200-word short essay, Explain how do oxidation numbers vary with the periodic table?

Using the criteria at the bottom of the page, respond to the following: 1. Explain the meaning of biodiversity by using, as an example, an ecosystem of your choice–e.g. animal’s body,  tundra, ocean, swamp. Note the general benefit of this ecosystem to its inhabitants. 2. How is biodiversity related to sustainability? Base your response on the meaning of words such as monoculture, monocrop, homonegeity. Use an example a local project (close to where you live, in southern Ontario) that promotes biodiversity and sustainability. You will receive full marks if your response…. .…is at least 200 words .…is on time .…demonstrates a knowledge and understanding of the readings .…is written clearly, edited for grammar, coherent .…is original, i.e., your own work–rather than a copy or re-iteration of other posts before yours ….contains two references from your readings and made use of in-text citations when citing the readings, and included a references list at the bottom of your response. …if you include an additional post responding meaningfully to someone else’s response.