Chemistry Questions and Answers

  • Why are alkali metals extremetly reactive with halogens?
  • Why are Chemistry & microbiology considered to be physical sciences?
  • Why are chemistry formulas important?
  • Why are colloids excellent adsorbing agents?
  • Why are compouns containing transition metals colored?
  • Why are concentrated and dilute not exact terms?
  • Why are crystalline structures called, 'hexagonal", "face-centred" and "body-centred" packed structures?
  • Why are enormous amounts of energy required to separate a nucleus..etc?
  • Why are enzymes produced by animal more effective than enzymes produced by plants?
  • Why are esters (-OCOR) and amides (-NHCOR) less activating than ethers (-OR) and amines (-NH) ?
  • Why are fluoro-compounds often used as derivatization agents in GC-MS?
  • Why are gases more soluble in cold solvents?
  • Why are halogens?
  • Why are heat and alcohol used to disinfect medical equipment?
  • Why are hydrocarbons generally soluble in water but soluble in solvent like CCl 4 and ether?
  • Why are isotonic solutions used as parenteral solutions?
  • Why are lemons (acidity) able to prevent oxidation?
  • Why are lithium and "Ca" in the electrochemical series anomalies which don't agree with the reactivity series?
  • Why are many organic compounds liquid or gas at room temperature?
  • Why are melting/boiling points different across ionic,metallic,covalent molecular and covalent network?
  • Why are more than 90 percent of all compounds organic compounds?
  • Why are natural products better than synthetic ones?
  • Why are noble metals difficult to corrode?
  • Why are oxides,carbonate and sulphide of potassium and sodium not found in nature??
  • Why are plastic and petroleum non-renewable?
  • Why are shampoos acidic and soaps are acidic?
  • Why are some substances more soluble than others?
  • Why are soo many different kind of buffers used for every process and reaction of an experiment?
  • Why are substances, composed of polar molecules, usually liquids at room temperature?
  • Why are the atomic masses of some elements in paratheses?
  • Why are the helium-filled balloons at the grocery store almost always silver colored?
  • Why are the melting pt. & boiling pt. of butane & 2-methylpropane different...?
  • Why are the noble gases caleed "noble"?
  • Why are the outermost electrons the only ones included in the electron dot diagram?
  • Why are the valence electrons of an atom the only electrons likely to be inolved in bonding to other atoms?
  • Why are valent electrons important in arranging the other electrons around the nucleus?
  • Why are Vitamin D, E, K deficiencies rare while deficiencies B and C far more common?
  • Why Aspirin have a sour taste?
  • Why at 25 degress Celcius is there a red prodigiosin pigment and at 37 degrees there is not for s. marcescens?
  • Why at 25 degress Celcius is there a red prodigiosin pigment and at 37 degrees there is not for s. marcescens?
  • Why balance in nature necessary?
  • Why blood taste like a iron?
  • Why can one tank of helium can fill 700 balloons?
  • Why can a molecule contain polar bonds, and yet be a nonpolar molecule?
  • Why can metallic copper be dissolved by nitric acid but not by HCl? (involves standard reduction potentials)?
  • Why can only food that contains water molecules can be heated using microwaves?
  • Why cannot hydrogen be fixed exactly with respect to all of the other elemts listed in the activity series?
  • Why can't a diluted NaOH solution of 0.3M be used as a standard solution of base?
  • Why cant aerosol cans be stored at high temperatures?
  • Why can't Hydrogen be grouped in a family?
  • Why can't hydroxyapatite be dissolved in water? Please help me here..?
  • Why can't I balance the equation CaO + H2O -> Ca(OH)2 + H2?
  • Why can't I make HNO3 by electrolysis of KNO3 solution?
  • Why can't you calculate the ph of acetic acid as -log[hc2h302]?
  • Why can't you look at a blowtorch?
  • Why chlorine is very reactive,while argon is unreactive?
  • Why copper(II) sulphate has to be evaporated naturally to get larger crystals?
  • Why Cs is placed before Fr in periodic table?
  • Why curd and sour substance not stored in copper vessel?
  • Why curd and sour substances should not be stored in brass and copper vessels?
  • Why cyanic and isocyanic acid react with water to produce the same conjugate base?
  • Why density of water is greater than alcohol?
  • Why did purified water rust an iron nail quicker than salt water?
  • Why did walter gilbert win the nobel peace prize for chemistry in 1980?
  • Why didn't Mendeleev use atomic number to arrange elements, instead of atomic mass?
  • Why do the reactivity decreases as: phenol>water>ethanol ?
  • Why do acids and bases only react with each other in water?
  • Why do alcohol cause a lower boiling point when dissolved in water?
  • Why do alkanes have very different melting points?
  • Why do all the atoms of azobenzene lie in one plane and hydrazobenzene do not?
  • Why do apples turn brown?
  • Why do atoms form chemical bonds?
  • Why do batteries need a salt bridge?
  • Why do bubbles appear in tap water?
  • Why do buffers require weak acids/bases?
  • Why do certain precious metal occur in uncombined forms?
  • Why do cheap rings turn your finger green?
  • Why do chemicals have such weird and difficult names?
  • Why do cobbwebs form?
  • Why do compounds with strong intermolecular attrative forces have higher boiling points then compunds with...?
  • Why do cut apples pears bananas and potatoes turn brown??
  • Why do electrons produce electricity? Where does the electricity originate?
  • Why do equations need to be balanced?
  • Why do gases diffuse through each other and through the air?
  • Why do H+ ions conduct electricity much better than Na+ ions?
  • Why do ionic compounds have high solubility in water, compared to their solubility in any other solvent?
  • Why do ionic substances conduct electrcity, while covalent substances do not?
  • Why do prokaryotes use formyl-methionine when eukaryotes use methionine for protein synthesis?
  • Why do red blood cells burst if they are placed in a solution of pure water?
  • Why do red cells, which contain an aqueous solution of dissolved solutes, burst when placed in fresh water?
  • Why do salt grow crystals and sugar don't?
  • Why do shards of glass taste like blood...?
  • Why do spounges obsorbe water?
  • Why do strong acids conduct electricity better that weak acids?
  • Why do substances like salt and sugar dissolve in water?
  • Why do substances like salt and sugar dissolve in water?
  • Why do the indented numbers on a credit card lose their colour so easily?
  • Why do the number of eggs you put in a cake batter change the fluffiness of the cake?
  • Why do the urasel is present only in RNA? why don't in DNA? and thymine is present in DNA why not in RNA?
  • Why do they put Silica Gel sachets in shoe boxes?
  • Why do we blow on a match to put the flame out and yet blow on a fire to make it burn?
  • Why do we have only electrons in the current?
  • Why do we need salt?
  • Why do we need uranium?
  • Why do we precipitate Cadmium in dilute solution?
  • Why do we put out fires with water?
  • Why do white candles burn slower?
  • Why do yeast cells die in high temperatures?
  • Why do you have to refrigerate orange juice before opening, but not apple juice?
  • Why do you need hot water to dissolve the lead chloride?
  • Why do you use hydrochloric acid to wash copper? Why is it also important to do a final wash with water?
  • Why do you want to be Internet/Intranet Designer?
  • Why does 1-Pentanol have a higher boiling point than Methanol?
  • Why does 2h2o is same as 2 mol of h2o?
  • Why does 7a (periodic table) end in "ine"?
  • Why does a chapatti inflates on putting over gas stove ??
  • Why does a cut apple change color?
  • Why does a fire produce smoke?
  • Why does a glowing splint burst into a flame whenoxygen gas is tested?
  • Why does a glowing splint turn on a flame when put in oxygen gas?
  • Why does a pH of 0 indicate a strongly acidic solution? Why does a pH of 14 indicate a strongly basic solution
  • Why does a solid has more mass than the same volume of gas?
  • Why does Albuterol makes you so shaky and hyper? What are the ingredients used.anythigng dangerous?
  • Why does Alka-Seltzer dissolve in liquids like Pepsi?
  • Why does aluminium bromide dissolve in benzene but aluminium fluoride doesnt?
  • Why does aluminum react with strong bases?
  • Why does an increase in temperature increase the rate of exothermic as well as endothermic reactions?
  • Why does an increase in temperature increase the solubility of KNO3?
  • WHY does bleach destroy cotton?
  • Why does bread harden after laying out for long time?
  • Why does bread mold?
  • Why does breaking bonds requires energy and making them release energy?
  • Why does brine conduct electricity and sugar solution dont?
  • Why does bronze not rust?
  • Why does cabbage react with acids and bases?
  • Why does carboate(co3) have -2 charge?
  • Why does cell potetial increase if NA2S is added to a [Cu(NH3)4] complex (Cu .001M, Na2S .2M)?
  • Why does CO2 release when you bang the top of a beer?
  • Why does compressing a gas always raise its temperature?
  • Why does concrete have a low tensile strength?
  • Why does copper have a distinct "metallic" smell? Pennies, for example.?
  • Why does copper sulphate appear blue?
  • Why does copper(I) chloride have to be finally washed with alcohol and then ether?
  • Why does Cu react with HNO3 despite the fact thatCu is less reactive than hydrogen?
  • Why does different types of vehicle engine produce different exhaust emissions?
  • Why does dye mix well with water?
  • Why does electrical conductivity of a metal increase as it is cooled?
  • Why does ethanol and hexane mix?
  • Why does gasoline smell so delicious?
  • Why does graphite not dissolve in water?
  • Why does helium cause balloons to float?
  • Why does helium make your voice go high?
  • Why does Hydrogen create water, and not hydrogen peroxide when it burns?
  • Why does ice crack when you put it into a liquid?
  • Why does increasing the temp of an reaction also increase the rate?(multiple choice)?
  • Why does it take longer for an egg to boil on Mount Everest than it does on regular ground?
  • Why does liquid that I poured of off ham form hexagon shapes?
  • Why does metal glow red when you heat it with a blow torch? Do different metals glow other colors under heat?
  • Why does NaOH + H2CO3-->NaHCO3 + H20, and sometimes 2NaOH + H2CO3 -->Na2CO3 + 2H2O?
  • Why does nitric acid turn your skin yellow?
  • Why does onion make you cry?
  • Why does paper get crinkly when it drys after it gets wet?
  • Why does pH paper fail to give a proper reading for basic household bleach(6.0 % NaClO) after several minutes?
  • Why does phosphate(po4) have a (-3) charges?
  • WHY DOES Polar dissolve in polar while non-polar dissolve in nonpolar?
  • Why does pop explode with mentos?
  • Why does rhombic sulfur behave differently than polymeric sulfur?
  • Why does SiCl4 has a lower boiling point than PCl3?
  • Why does sodium form a plus one ion?
  • Why does solubility increase with temperature?
  • Why does something get wet and stay wet?
  • Why does sulfuric acid conduct electricity better than citric acid?
  • Why does surgical spirit go cloudy in water?
  • Why does tannic acid remove rust from iron parts?
  • Why does the 4s sublevel fills before the 3d sublevel begins to fill asl as electrons are added?
  • Why does the liquid in egg become solid when all liquid evaporate?
  • Why does the melting and boiling point of the group one alkali metals decrease as you go down the group.?
  • Why does the melting point of water remain constant?
  • Why does the paint on some mugs changes color when we pour hot drinks into them?
  • Why does the polymerisation reaction stop when a dideoxy nucleotide is added to the 3' end of the molecule?
  • Why does the ratio for a primary emulsion have to be 4:2:1 for a particular oil..(or 3:2:1 or2:2:1or 1:2:1)?
  • Why does the size of the atom bonded with hydrogen affect h-bonding..?
  • Why does the sound of running water change pitch as the water gets hotter?
  • Why does the temperature in an exothermic reaction increase, reach a maximum temperature and then decrease.?
  • Why does the temperature increases for a few readings after adding the zinc?
  • Why does the Tyndall effect occur with colloids but not with true solutions?
  • Why does thermocol contract on heating while other solids expand?
  • Why does Tin (II) Bromide dissolve in water faster than Carbon Dioxide?
  • Why does vinegar kill all the alkaline earth metals?
  • Why does water and paint thinner stay separate?
  • Why does water appear blue when its clear?
  • Why does water boil faster with salt in it than it does without?
  • Why does water bubble when it boils?
  • Why does water fizzle?
  • Why does water have a higher boiling point than methane?
  • Why does water increase in size when it freezes?
  • Why does water stay in the cup when you put paper on top?
  • Why doesn't a buffer of equal concentrations CH3COOH and CH3COO- change pH when NaOH (a strong base) is added
  • Why doesn't copper react with HCl?
  • Why doesn't fire react with chlorine?


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