chem

  1. A

    Chem Experiment Assistance

    Hello. I attempted to do the experiment which I have seen many times where sulfuric acid reacts with sugar and makes a black solid and some smoke. We used about 4M H2SO4 which we got from a car battery, and the reaction did not work. Next we added Baking Soda to the mix in order to see if that...
  2. S

    Atomic bomb

    Is there any substance that scientist has made that can destroy ayomic bomb?:d
  3. H

    Need help with Chem Lab!

    Hello everyone! Hopefully all of my fellow Americans have been enjoying a nice Thanksgiving break, and well.. everyone else... I hope you have been having a great week! Anyway, I need some major help with my Chemistry lab. Essentially we did the lab in school, and we had to answer questions...
  4. S

    Chem 101: explanations would be appreciated!

    Hello my scientific community, I have just begun my Chem 101 classes at college. I became overly frustrated with a few problems and have turned to the internet for some answers. Hopefully this method of education will help solidify my understanding. Most of the trouble that I am having is with...
  5. B

    Calculating Ksp CHem 12 problem?

    A student determined that exactly 0.0533 g of manganese (ii) fluoride was dissolved in 800 mL water to make a saturated manganese (ii) fluoride solution. What is the Ksp for manganese (ii) fluoride? solubility related to [ions] reacted 0.0553 g MnF2 dissolves/800 mL * 1 mol/ 92.9g * 1 mol...
  6. A

    Help with a few practice problem for Chem 107 please!

    1) A 2.5L mixture contains 3 gases. N2, He, and Ne at partial pressures of .32 atm of N2, .15 atm He, and ,.42 atm Ne. Calculate the total pressure. 2) A mixture of He and Ne gases are collected over water at 28.0C and 745 mmHG. If the partial pressure of He is 368 mmHg, what is the partial...
  7. D

    More AP Chem Questions

    Please someone tell me HOW to do these. NOT the answers!!! I really have no idea whatsoever! :( 1. A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 3.45 L. 309 K 281 K...
  8. R

    AP Chem question about concentration

    The concentration of KI solution can be determined by first adding excess silver nitrate to the solution. I-(aq) + Ag+(aq) ------> AgI(s) The excess silver ion remaining in the solution then determined by a reaction with a potassium thiocynate solution of known...
  9. B

    Can anyone give me some ideas for a chem project?

    I'm not asking to be spoon fed. I just dont even know where to start. But the project is Create a unique and effective visual learning tool that can be used to teach and understand the various groupings and characteristics of the periodic table. I don't even know how to approach that. I know...
  10. D

    AP Chem/Pre-AP Chem review: Can someone help me with this sol. stoich. question?

    ** We haven't gotten to that part where we take into account that not everything will react completely and we don't subtract the precipitate from the total mL. My class will start taking those things into account after we finish the pre-ap chem review.** Problem: An unknown volume, X of 0.731M...
  11. W

    Freaking out about first chem exam!!

    Hey guys. So.. I am retaking General Chemistry II at my local community college and I am freaking about the material. I've been studying with my friend and I've been practicing problems in the book and I've been looking at the book and the skeletal powerpoints to get an idea of what concepts I...
  12. S

    Final chem assignment due in on monday. Please check my answers

    Classify the chemicals in the list in compounds, ions, elements or mixtures. Write the molecular formulas of compounds, ions and elements. Suggest components of the mixtures. 1. Deionised Water 2. Carbon 3. Bronze 4. Milk 5. Chlorine 6. Ammonia 7. Sulphuric Acid 8. Sodium Nitrate 9. Bromine...
  13. M

    have a question regarding IUPAC naming in organic chem

    I just learned the IUPAC system. Like just an hour ago. My book references this example: CH3 | CH3-C-CH3 | CH3 and asks me to give the IUPAC name for this organic compound. Following the rules I learned, I say this molecular structure is: 2,2-dimethyl propane where propane is...
  14. P

    Please help with solutions type problem!

    A 100.0 mL solution of a weak base was titrated with 0.200 M HCl. A volume of 48.00 mL of the 0.200 M HCl was? needed to reach the stoichiometric endpoint. After 24.00 of the 0.200 M HCl had been added, the pH of the titrated solution was 10.00. A. Determine the pKb for this base. B. Calculate...
  15. K

    Chemistry Problem - Complicated, Anyone?

    So I have this chemistry problem my instructor gave to me for my honors project that I have to explain to the class. The problem is I dont understand how to do that, I have gone through my book and other sources. Can anyone help me see how to work this one? I know what all the terminology means...
  16. S

    Bio chem questions.

    Not sure if this belongs here or not, but im having some problems finding answers for some questions. Glucose molecules can form links with each other. a) Give an example of two sugars and of two polysaccharides that can be formed in this way. b) Describe the links between monomers in the...
  17. M

    Stoichometry: Balancing Chem Eq,molarity

    I need someone to check these problems for me, particularly the 2nd one, I'm not sure if I'm doing it right. 1) Write the balanced equation for: Mg + 0 Solution: 2MgO 2) If .05g og Mg is used, how many grams of MgO is produced? I know for this one I have to get the theoretical yield...
  18. R

    Undergraduate Organic Chem question Partition Coefficient

    This is the first problem of many like this, I have tried to find out how to answer this on my own for the past 2 hours, if someone could help me solve this so I know how to do the rest I would greatly appreciate it. I know in a mixture of ether and water, water is the top layer because it is...
  19. H

    Is the molecular model kit worth it (Organic Chem)

    I am wondering if the molecular model kit is worth buying and using during a test. I am asking because I am worried that putting the pieces together will waste valuable test time. The reason I am considering a kit is because I am having trouble visualizing the Cahn-Ingold prelog when the...
  20. jenniamigo

    Studying for an Exam.....

    So I am attempting the problems on my study guide for the test on tuesday. I understand how to recognize the precipitation, redox, and acid reactions; I did pretty well on balancing equations, and even calculating ionic equations. But then I got to the long problems and I am at a loss here. I...