Answers edited by Martin M.

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• The molar heat of fusion of iron is #14.9# kJ/mol. What is the energy (in kJ) needed to melt #4.50g# of iron?
  
• What is the difference between essential amino acids and nonessential amino acids?
  
• Is Gibbs energy negative?
  
• What is the [#OH^-#] in a solution of pH 3.00?
  
• How did you get to know about Socratic?
  
• Question #8c873
  
• What is encouraging contributors to write long answers when the same thing can be explained in two to three lines?
  
• Why do organisms sometimes have to compete for resources?
  
• What happens to particles when you add heat energy?
  
• Why is graphite a good conductor?
  
• Question #739ef
  
• Question #4bc39
  
• Question #7b9b5
  
• #H_2(g) + Cl_2(g) -> 2HCl(g)+#. If 2 mol of hydrogen gas are mixed with 4 mol of chlorine gas, how many moles of hydrogen chloride will be produced?
  
• What is the chemical equation of burning fossil fuels?
  
• As the #H^+# in a solution decreases, what happens to the #OH^-#?
  
• Why is a chemical synaptic transmission unidirectional? Does calcium open up Ca+ channels in the bulb and Ca+ rushes in and allows for neurotransmitters to enter?
  
• Question #1da6b
  
• Where are intermolecular forces found?
  
• In most pure substances, melting occurs at a specific temperature called the what?
  
• Question #5da9f
  
• How do you convert g to mg?
  
• What evidence supports the theory of endosymbiosis?
  
• What is the #H^+# concentration for an aqueous solution with pOH = 3.05 at 25°C?
  
• Question #58548
  
• How do we define life?
  
• Is mercury a poison for humans?
  
• What sequence of coefficients will balance the following equation? #Ca(s) + O_2(g) -> 2CaO(s)#
  
• Question #7c266
  
• How is an ionic bond formed? How is a covalent bond formed?
  
• How does cellular respiration affect the carbon cycle?
  
• The number 40 has how many significant figures?
  
• Question #168d2
  
• What is the formula for kinetic energy?
  
• What is the product of reacting #"Br"_2# in methanol with methylenecyclohexane?
  
• What is the significance of myelin on neurons?
  
• What weight of #AgCl# will be precipitated when a solution containing #4.77#g of #NaCl# is added to a solution of #5.77g# of #AgNO_3# ?
  
• Question #be740
  
• What is it about our body that causes us to 'stick' to the source in case of an electric shock?
  
• Does increasing the temperature affect the rate of reaction?
  
• How many resonance structures can be drawn for ozone?
  
• Question #75b0d
  
• Question #4a1f3
  
• Protein synthesis is the process of what?
  
• How can enzymes be denatured?
  
• What is formed from the reaction of an acid and a base?
  
• What is the best Lewis structure below?
  
• Why is cohesion important in biology?
  
• Given the reaction: #NaOH(s) + H_2O(l) -> Na^"+"(aq) + OH^"-" (aq) + 10.6 kJ#, the heat of reaction, #ΔH#, is (positive/negative), the entropy, #ΔS#, is (positive/negative) and the reaction is (spontaneous/not spontaneous). Thermochem?
  
• A solution has a pOH of 6.39. What is the solutions pH? (You must answer to the correct number of s.d.'s)
  
• What is the mass percent of the sample that was actually #"Fe"_2"O"_3#? The unbalanced reaction was #Fe_2O_3(s) -> Fe_3O_4(s) + O_2(g)#
  
• What is the function of restriction enzymes?
  
• What are the resonance isomers for ozone, #O_3#?
  
• A certain amount of rubidium iodide was dissolved in #"4.6 L"#. A #"1-L"# aliquot was extracted an diluted to #"13.9 L"# to form a #"0.65 M"# solution in water. What mass of rubidium iodide was dissolved into the original solution?
  
• Question #8d967
  
• How do you know or figure out if a chemical bond between several atoms is polar?
  
• The density of water is 1.00 g/mL at 4°C. How many water molecules are present in 2.46 mL of water at this temperature?
  
• What is percentage composition of element by mass in the lithium nitride salt, #Li_3N#?
  
• How do you calculate the molecular formula of a compound with the empirical formula #C_n H_(2n) O# and a molar mass of 150 g/mol?
  
• What happens in a cancer cell that is different than in a normal cell?
  
• What are the main functions of phosphorus in living organisms?
  
• A sugar, a phosphate group, and a a nitrogen base form the building blocks of which organic compound?
  
• Question #cf954
  
• Question #0da15