Answers created by Nick

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• Question #87747
  
• How many molecules of #N_2O_3# are present in 28.3 g of #N_2O_3#?
  
• How can you determine formula mass?
  
• What are the differences between UV absorbance and fluorescence spectroscopy?
  
• Why does diabetes affect the feet? Once your sugars are under control, will your ability to heal at a normal pace come back?
  
• Do only pathogens have antigens?
  
• What units can measure distance?
  
• What is a hood used for in the chemistry laboratory?
  
• Question #992dd
  
• How do you solve #2x - 5- 3x + 7= 10#?
  
• Question #5983a
  
• A compound is 53.31% C, 11.18% H, and 35.51% O by mass. What is its empirical formula?
  
• What does a parenthesis mean in a formula?
  
• What are some examples of golgi apparatus?
  
• How do you calculate the molar mass of each of the following compounds?
  
• Question #6b43d
  
• Which factor does a scientist choose to keep constant over the course of a experiment?
  
• How many gallons of a 3% salt solution must be mixed with 50 gallons of a 7% solution to obtain a 5% solution?
  
• Why is protein sequencing useful?
  
• Why is it important to remove all the contents of your tubes before attempting to load a gel?
  
• You have a solution of 0.01 M #Ni(NO_3)_2#, absorbance was 0.4 at 400 nm with a path length of 1 cm. Using Beer's Law, how do you calculate #epsilon# for this solution?
  
• What name is given to substances that resist changes in pH?
  
• What is the SI scale used to measure temperature?
  
• What type of atom is sodium?
  
• When two gases have same number of moles then they also have same number of molecules. Is it correct?
  
• What is a Golgi Apparatus?
  
• Why are signal transduction pathways often so complex?
  
• Question #006f1
  
• Why GAPDH is used in Western Blot?
  
• What is the mole fraction of #KCl# in an aqueous solution that contains 26.3% #KCl#?
  
• How do you write 647.2 in scientific notation?
  
• What is gel electrophoresis used for?
  
• What might be the problem if the bands are not appearing in Western Blot?
  
• How do you calculate the average atomic mass of magnesium, given the following percent abundances and isotopic masses: #78.99% .^24Mg (23.98504 u)#, #10.00% .^25Mg (24.98584 u)#, and #11.01% .^20Mg (25.98259 u)#?
  
• What is the unit symbol for the prefix milli?
  
• When salt is dissolved in water, water is the considered?
  
• Why is genetically modified food dangerous?
  
• How do you find molecular weight?
  
• What are enzyme cascades?
  
• A nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?
  
• How are enzymes isolated?
  
• How does a spectrophotometer work?
  
• What is western blotting?
  
• How many atoms exist in a #23*g# mass of sodium metal?
  
• Question #32a90
  
• Question #7cc46
  
• How is moles the same in dilution?
  
• How do DNA databases work?
  
• What is the name of #KH_2PO_4# ?
  
• How does rough endoplasmic reticulum differ from smooth endoplasmic reticulum?
  
• What is the molecular weight of air?
  
• How do you find molecular weight of an element?
  
• What is molecular weight in chemistry?
  
• What is molecular weight measured in?
  
• Why are functional groups important in biology?
  
• What are some common mistakes students make with biochemistry?
  
• What is chromatography ion exchange?
  
• Why is western blotting called so?
  
• Why is western blot better than elisa?
  
• What is the difference between antibody capture ELISA and Sandwich ELISA?
  
• Why is western blot used to confirm elisa?
  
• In an ELISA test, what reasons could there be for a positive test when you don't have the disease?
  
• What is SDS-PAGE of proteins?
  
• What is the volume in milliliters of a 5.01 M silver nitrate solution that contains 275. mmol of silver nitrate?
  
• How many grams of NaOH are needed to prepare 800 mL Of 0.8 M solution (Mw NaOH = 40.00 g / mole) ?
  
• How many grams of NaCl are present in 350 mL of 0.020 M NaCL solution? (Remember that 1 mole NaCL = 58.44 grams g/mole.)?
  
• What is the molarity of 400 g of #CuSO_4# in 4.00 L of solution?
  
• What is the name of #P_4O_6# ?
  
• What is the mass of #NaCl# required to prepare 0.5 liters of a 2.5 molar solution of #NaCl#?
  
• What is the molarity of .50 mol of #MgCl_2# in 1.5 L of solution?
  
• What is the molarity for 23.4 g of sodium hydroxide in 250.0 mL?
  
• What is the molarity of the solution #.32 x 10^2 # moles of #CH_3COOH# in 20.0 liters of water?
  
• What is the molarity of a 500.0 mL solution containing 0.75 moles of solute?
  
• Question #31bc6
  
• Why did chemists develop the concept of molarity?