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Lipid Bilayer in Cell Membranes
Lipid Bilayer in Cell Membranes
Describe the role of phospholipids in the lipid bilayer.

What is the function of cholesterol in the cell membrane?
Chemistry   kirakira15   26   Asked 4 days ago
Calculating a Percentage
Calculating a Percentage
Two questions:

In the forensic laboratory, a bullet found at a crime scene may be used as evidence in a trial if the percentage of three metals, usually lead, tin, and antimony, is a match to the composition of metals in a bullet from the suspect’s ammunition. If a bullet found at the crime scene contains 13.9 g of lead, 0.3 g of tin, and 0.9 g of antimony, what is
Chemistry   chementhusiat   117   Asked A year ago
Draw the products of these reactions
Draw the products of these reactions
(see attachment; let me know if it's hard to see)

Provide products for each of the reactions below. Show all enantiomers and/or diastereomers. Circle any meso compounds that are produced.

Any help and explanation would be appreciated. I'm pretty lost with this topic; I started drawing some of the products but I think they're all wrong
Chemistry   LaviBookman   197   Asked A year ago
Calculate the molar enthalpy change of neutralisation of potassium carbonate. Assume that all ...
Calculate the molar enthalpy change of neutralisation of potassium carbonate. Assume that all ...
When 2.76g of potassium carbonate were added to 30.0cm^3 of 2.0mol/dm^3 hydrochloric acid, the temperature rose to 5.2°C. Write the equation for this reaction. Calculate the molar enthalpy change of neutralisation of potassium carbonate. Assume that all solutions have a density of 1.0g/cm^3
Chemistry   Christianah   362   Asked 2 years ago
Serial Dilutions from 3M to 0.1-0.2
Serial Dilutions from 3M to 0.1-0.2
Design a dilution scheme to achieve the following aims. Make sure to draw the dilution scheme, include the volume of dilution blanks used, volumes transferred, and the fold dilution that corresponds to the volume transferred.

4. In order to be able to decipher protein structure on StructureSupraX2000, the protein concentration has to be in the range of 0.1-0.2 nM.  Y
Chemistry   karmahone   250   Asked 2 years ago
Lewis Structures and Molecular Models
Lewis Structures and Molecular Models
These are questions for a pre-lab and I do not understand how to do these at all. I talked to the teacher and he only gave me the definitions and told me to think about what it is asking for. Thanks for the help!!!

1.  Ozone absorbs ultraviolet light in the upper atmosphere thus protecting us from sunburn.  Down at ground level however, ozone is a pollutant whic
Chemistry   Boedecjt01   430   Asked 2 years ago
How would the amount of NaOH differ if the concentration of the NaOH were doubled?
How would the amount of NaOH differ if the concentration of the NaOH were doubled?
Doing Virtual Chemlab 6-3 : Concepts in Acid-Base Titrations and I'm not really understanding the question my teacher is asking.

The next question she asks is: "How would the amount of NaOH differ if the concentration of the HCl were doubled?"

Any ideas? Please help! Thank you!
Chemistry   Andalyne   461   Asked 2 years ago
Which of the statements listed below is true regarding the following redox reaction occurring in a ...
Which of the statements listed below is true regarding the following redox reaction occurring in a ...
Which of the statements listed below is true regarding the following redox reaction occurring in a spontaneous electrochemical cell?
Sn(s) + Cu2+(aq) → Cu(s) + Sn2+(aq)
Question 40 options:
   
Sn is oxidized at the cathode.
   
Anions in the salt bridge flow from the Sn half-cell to the Cu half-cell.
   
Cu2+ is reduced at the anode.
   
El
Chemistry   jbee89   740   Asked 3 years ago
Identify the "gas evolution" reactions among the following
Identify the "gas evolution" reactions among the following
1. 2HCl(aq)+K2CO3(aq)---->H2O(l)+CO2(g)+2KCl(aq)
2. CH4(g)+2O2(g)----->CO2(g)+2H2O(l)
3. 2HCl(aq)+K2S(aq)------>H2S(g)+2KCl(aq)
Chemistry   lovebugbuglove   623   Asked 3 years ago
Thinkwell Chemistry lab #4's last question...
Thinkwell Chemistry lab #4's last question...
If you have ever been to a public pool, you know that you are required to exit the pool when there is lightning in the sky. But consider your results from part (a) above and what you learned in this lab, paying particular attention to the very first demonstration that the instructor shows you regarding the light bulb. Does this protocol make sense in light of the data from this demo
Chemistry   Scoobee   279   Asked 3 years ago
What is the name of the reagent in this orgo chem problem? ( picture attached)
What is the name of the reagent in this orgo chem problem? ( picture attached)
Hello,
 
    I've been trying to understand why this happens and how, but I've never seen this before. Also, it's hard to read the reagent. Does anyone know what it says and how the ring closes?

Thanks for your help!
Chemistry   fdr13001   230   Asked 3 years ago
During the production of fertilizer, NH3(aq) reacts with H3PO4(aq). For this
During the production of fertilizer, NH3(aq) reacts with H3PO4(aq). For this
During the production of fertilizer, NH3(aq) reacts with H3PO4(aq). For this chemical reaction, match each description with the appropriate term from the following list. Place your answer in the blank space given.

i.   acid
ii.   base
iii.   conjugate acid
iv.   conjugate base
      
   a.   H2PO4–(aq)
   b.   H3PO4(aq)
   c.   NH3(aq)
   d.   NH4+(aq)
Chemistry   biochicka   561   Asked 3 years ago
Previous reply:Plancks equation will help: E=hf=hc/? ?=hc/E
Previous reply:Plancks equation will help: E=hf=hc/? ?=hc/E
When E=hc/?, to solve for ?, multiply each side of equation by 1/hc, giving ?=E/hc What rule/property allows above example/reply invert E/hc to hc/E?
Chemistry   magendaswede   227   Asked 3 years ago
In what ways does the weather influence acid deposition?
In what ways does the weather influence acid deposition?
In what ways does the weather influence acid deposition?
Chemistry   biochicka   279   Asked 3 years ago
Chemistry question on enantiomers
Chemistry question on enantiomers
So this is actually a question in my biology class but it is a question about enantiomers so I figured I'd put it in Chemistry. Anyway! So the answer is A being that A is NOT an enantiomer. I'm not understanding why it's not if D is the same thing just with CH3 instead of a H. Any help is appreciated.
Chemistry   Xabien   337   Asked 3 years ago
According to acid deposition what is an emission? List the three major types of
According to acid deposition what is an emission? List the three major types of
According to acid deposition what is an emission?  List the three major types of emissions. Describe the sources of each type of emission.
Chemistry   biochicka   302   Asked 3 years ago
Having trouble on excel graphing the distillations
Having trouble on excel graphing the distillations
Hello if anyone could guide me or show me how they graph this on excel that would be great. I don't see the bins or ranges option in the excel 2011 version.

I am trying to graph a fractional and simple fractional distillation.
With temperature on the x axis and volume in ml on the y. I don't know how to do the ranges in the x axis.
Separation of unk
Chemistry   pringles08   260   Asked 3 years ago
Using Hess's Law and any necessary information from your Data Booklet, calculate
Using Hess's Law and any necessary information from your Data Booklet, calculate
combustion of ethene
Using Hess's Law and any necessary information from your Data Booklet, calculate the molar enthalpy of reaction for the combustion of ethene in kJ/mol.
C2H4+ 3O2 ---> 2CO2 + 2H2O
Chemistry   aisha1   311   Asked 3 years ago
The concentration of hydronium ions, i.e. (H3O+), in a solution is measured
The concentration of hydronium ions, i.e. (H3O+), in a solution is measured
The concentration of hydronium ions, i.e. (H3O+), in a solution is measured to be 8.6x10^-9 mol/L. What is the pH of the solution? Is this solution an acid or a base?
Chemistry   biochicka   351   Asked 3 years ago
How do sulfur oxides end up in our environment? List as many sources as you can.
How do sulfur oxides end up in our environment? List as many sources as you can.
How do sulfur oxides end up in our environment? List as many sources as you can.
Chemistry   biochicka   244   Asked 3 years ago
Calculate the concentration in Pb2+ of the solution.
Calculate the concentration in Pb2+ of the solution.
Hi there,

I'm not sure if I've done this problem right, I would really appreciate any help.

Quote
A sheet of lead is plunged in a 0.1 M solution of sulfuric acid. The following reaction takes place:

Pb  +  2 H+    Pb2+  +  H2

The potential of the solution is immediately measured. The result is E =
Chemistry   RowanF   344   Asked 3 years ago
Which of the following cannot form both high and low octahedral complexes Cr2 ,
Which of the following cannot form both high and low octahedral complexes Cr2 ,
which of the following cannot form both high and low octahedral complexes Cr2 ,
Chemistry   pragyan89   461   Asked 3 years ago
A solution is made containing 8.50 g CH3OH (density = 0.791 g/mL) in
A solution is made containing 8.50 g CH3OH (density = 0.791 g/mL) in
2)   A solution is made containing 8.50 g CH3OH (density = 0.791 g/mL) in                                250 g H2O (density = 1.00 g/mL).  Calculate:

Chemistry   aholmes   1759   Asked 3 years ago
How does the rate of an E2 Elimination reaction affected by the ff. conditions?
How does the rate of an E2 Elimination reaction affected by the ff. conditions?
Conditions:
1. Reactant Structure: bromocyclohexane, chlorocyclohexane, iodocyclohexane
2. Base Strengths: 1.0 mL sodium ethoxide diluted with 1.0 mL ethanol as opposed to the original which is 2.0 mL sodium ethoxide
3. Temperature: reflux vs room temperature.
*Please provide specific explanations (even a 3 year old will understand) on how each factors affect the
Chemistry   angsthussler100   770   Asked 3 years ago
What is the product of the following reaction?
What is the product of the following reaction?
1. What is the product of the original reaction as shown?
2. If Br is replaced with Cl, what would be the product?
3. If Br is replaced with I, what would be the product?
(Three total answers)
Chemistry   angsthussler100   576   Asked 3 years ago
Design an experiment you could carry out to test the hypothesis that changing the catalyst will not
Design an experiment you could carry out to test the hypothesis that changing the catalyst will not
Design an experiment you could carry out to test the hypothesis that changing the catalyst will not affect the production of biodiesel.
Chemistry   biochicka   1058   Asked 3 years ago
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