[EASY] Limiting reactants

I require that you have a good grasp of English and be proficient in chemistry. That’s it, this assignment is so easy but I’m just too lazy to do it so I’ll pay more than its worth

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Chemistry Online HW

I have chemistry online hw for website called Knewton. There are 3 chapters (7,8,9) left for me. The number of questions is not that much; I can say about 34 not hard and multiple choice questions. 

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A 2.545g sample contains carbon, hydrogen and oxygen. It is subjected to carbon-hydrogen analysis and 3.703g of CO2 and 1.514g…

A 2.545g sample contains carbon, hydrogen and oxygen. It is subjected to carbon-hydrogen analysis and 3.703g of CO2 and 1.514g of H2O are collected. Calculate the mass od carbon and hydrogen sample.

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Consider the following potential energy profile le for the A + D reaction. (a) How many elementary steps are there?   (b) How…

Consider the following potential energy profile le for the A + D reaction.

(a) How many elementary steps are there?

 

(b) How many intermediates are formed?

 

  (c) Which step is rate determining?

 

(d) Is the overall reaction exothermic or endothermic?

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HW in mastering chemistery

Hello

I have HW online for chemistery due date today

if any body can do it please let me know 

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how can emulsifiers be used to clean an oil spill in the atlantic ocean

how can emulsifiers be used to clean an oil spill in the atlantic ocean

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General Chemistry Exam

I got in class exam will start about 3.5 hrs from now. 

 

20 Multible Choice questions only

duration 30 Munite

 

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I need your help in solving this post-lab in 3 hours

 

I attached  the following list in the attachment 

1-my lab notebook.

2post-lab questions.

3-two old post lab solutions.

4- Background & Procedure for this lab.

It is easy to do this post lab especially with old post lab solutions, but I have an exam and I need to study for it.

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CHEMIST RESEARCH PAPER

 

 

Write a five-paragraph rese arch paper on a chemist or a biochemist , focused on the following:

•  Field within  Chem  /  BioChemistry . •  Early life- place of birth, education, how they got involved in science. •  Greatest accomplishment and how it advanced their field •  Ways in which their discoveries and inventions improved the world. •  Any controversies surrounding their work •  Final events.

 

 

•  Your paper must include an introductory paragraph (with a strong thesis

statement ) and a concluding paragraph. You must also have a sources page .

•  You will be required to use at least three different sources: One  encyclopedia

( book  or online), one valid  Internet  source, and one additional source which may

be  a  book ,  magazine ,  newspaper , or  interview . 

•  You will create a title page following the given format. No word art.

•  Type your paper i n Times New Roman, size 12 font, with single spacing  and   upto  700 words.

•  You must use your own words. “Cut and Paste” is plagiarism and is not

acceptable .

 

 

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chem week 6

 

Prepare written answers to the following exercises:

 

1.     Imagine that you work at a company that prepares chemical solutions. You are asked to label a solution to sell to different customers. One customer is a hospital, another is a chemistry lab at a university, and a third is a physics lab at a university. You added 900 kg of NaCl in a 100-liter container and filled it with water to a volume of 100 liters. Assume standard (STP) conditions.

 

Determine the following:

 

·         Mass percentage of the solution for the customer in the hospital

·         Molarity for the customer in the chemistry lab

·         Molality for the customer of the physics lab

 

2.     A researcher is often required to prepare solutions in the lab. Typically, a lab provides a concentrated solution. This solution must be diluted to the proper concentration. Hydrochloric acid is a common stock solution that is typically purchased at 37.0% HCl concentration (density = 1.20 g/ml). You must make 100 ml of 0.25 M HCl to do a DNA extraction experiment. How much of the 37.0% HCl concentration stock do you need to prepare this solution?

 

3.     The Haber–Bosch process for fixation of nitrogen is one of the more important chemical reactions ever invented. Without the invention of this process, which is used to make ammonia for fertilizer, the world’s population would not be as large as it is today.

 

N2(g) + 3H2(g) à 2NH3(g)

 

·         List three ways in which the yield of ammonia in the reaction above can be improved for a given amount of H2.

 

·         Additionally, explain the principle behind each method.

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