Chemistry Questions and Answers

  • Why do urine specimens become alkaline and cloudy when standing at room temperature?
  • why do we blow on a match to put out the flame the flame and blow on a fire to make it burn?
  • why do we calibrate thermometers and pipets?
  • Why do we have to keep the volume of each reaction vessel constant in the initial rate reaction method?
  • why do we need hydrogen bonds?
  • why do we need lye in making soap? what is its significance? why do we need to mix the soap mixture? ASAP!?
  • Why do we need the element sodium?
  • Why do we use salt to melt ice and snow?
  • Why do you get an explosion when you put mentos in coke?
  • Why do you have to boil half the water required for jello?
  • why do you need to use amount in moles to solve stoichiometry problems? why can't you just convert from mass .
  • Why do you think alloys are called mixtures not compound??
  • why does (graphite) mass decrease under nitrogen gas in TGA?
  • Why does a 2-liter diet coke and Mentos candy erupt when put together?
  • why does a balloon filled with hydrogen gas deflates faster than a balloon filled with carbon-dioxide?
  • Why does a balloon pick up the electrons from your hair rather than vice versa?
  • why does a coating of tin on iron not give a chemical protection against the rusting of iron?
  • why does a firework go off or explode when you shake it?
  • why does a magnet sticks to some stainless steel but not all?
  • Why does a metal suface always feel colder than a wooden/plastic desk even at same temperature??
  • why does a nail rust faster in tap water than boiled water?
  • Why does a solution of HCl in water have diff. properties than HCl gas?
  • Why does a weak acid have a higher heat of nutralization when reacting with a base, than a strong acid?
  • Why does alcohol boil before water?
  • why does alka seltzer bubble less in an alcohol and water mixture and in just water? collison theory? thx?
  • Why does Alka-Seltzer explode in the presence of warm water?
  • why does aluminium foil not corrode as easily as a sheet of iron?
  • Why does aluminum have a much higher electron affinity than boron?
  • why does ammonia have a low boiling point?
  • Why does an enzyme need such a large number of amino acids?
  • Why does benzocaine precipitate during neutralization?
  • Why does burnt plastic smell so strongly and if something that was metal and plastic?
  • why does CdS dissolve in HCl, when CuS and Bi2S3 will not??
  • Why does copper gain mass when heated?
  • Why does Cu+ exist?
  • Why does cyclohexane form a layer on top of water when they are mixed?
  • Why does earth's atmosphere gases not escape into the near-vacuum of space?
  • why does fire burn upwards?
  • why does fire work explode when you shake it?
  • why does gas burn blue?
  • Why does H2O expand as it freezes?
  • Why does heat distort the sight you are looking at?
  • why does heat kill microorganisms?
  • Why does helium make your voice squeaky?
  • why does honey make peanut butter not stick to the roof of my mouth?
  • Why does hydrogen behave differently than other elements?
  • Why does hydrogen peroxide bubble when it comes in contact with potato?
  • Why does ice float on water?
  • why does ice melt when the outside temperature is below the freezing point of water?
  • Why does iodine dissolve in ethanol?
  • Why does iodine react with starch and not to sugar?
  • why does iron conduct electricity?
  • Why does it cost more to have to have chemical reactions at a higher pressure?
  • Why does making a bond release energy?
  • Why does Mentos and Diet Coke react explosively?
  • why does mentos only react violently with diet pepsi and not regular pepsi?
  • why does methane not react with air unless a flame or spark is applied to the mixture?
  • why does nitric acid stain the skin yellow?
  • Why does one Distill something in the lab slowly?
  • Why does Potassium come after Argon in the Periodic table?
  • why does pressure decrease as the altitude increases?
  • why does pulse increase with stress or exercise?
  • Why does running cold water on ice melt it quicker then hot water?
  • Why does salt conduct electricity and sugar does not?
  • why does salt increase the temperature of a boiling water?
  • why does salt make water boil faster?
  • why does salt preserve foods?
  • Why does salt separate from water?
  • Why does Silicon Dioxide have a high melting point, even though CO2 is in the same family(Carbon and Silicon)?
  • Why does soap rinse off easier under warm water?
  • why does some paint have zinc powder added to them?
  • why does some paint have zinc powder added to them?
  • why does steel is often coated in a layer of grease b4 being placed in long term storage?
  • Why does the cation of a salt affect the color of the flame produced when put under a Bunson Burner?
  • Why does the central atom have the lowest electronegativity?
  • Why does the citric acid cycle need oxygen to function ?
  • Why does the Clemmensen Reduction reduce only a single carbonyl group?
  • Why does the egg's glair turns white when we foam it? What happens to the molecules?
  • Why does the element sodium help us in are daily lives?
  • why does the energy value of an alcohol depend on the number of carbon atoms it contains?
  • Why does the exposed surface of a cut brinzal become black?
  • Why does the general formula for an alkane, CnH2n+2 correctly predict the hydrocarbons in a homologous series?
  • Why does the Ksp of a sparingly soluble salt remains the same in the presence of a common ion?
  • Why does the molecular structure of an alcohol affect the enthalpy change?
  • Why does the moon shine?
  • Why does the properties of the substance change when after mixing and heating it?
  • Why does the properties of the substance change when after mixing and heating it?
  • why does the size of atoms increase as you go down the groups in the periodic table?
  • Why does the the reaction between hydrochloric acid and magnesium result in hydrogen gas & magnesium chloride?
  • Why does the viscosity of car oil change with temperature?
  • Why does the volume increase as water is heated into steam?
  • Why Does Vinegar and baking soda create bubbles?
  • Why does vinegar turn dark and is it bad?
  • why does water attract plorar molecules and repel nonpolar ones?
  • Why does water get bubbles in it?
  • why does water have a higher boiling point than ethanol?
  • Why does water have a higher boiling point than ethanol?
  • Why does water have different properties from carbon dioxide if they have the same molecular shape?
  • Why does water in a flat, shallow dish evaporate more quickly than the same amount in a tall, narrow glass?
  • Why does you body work so hard to maintain pH levels?
  • Why does your nose run when eating some spicy foods?
  • Why doesn't asbestos burn?
  • Why doesn't baking soda freeze?
  • Why doesn't glue stick to the inside of the tube?
  • Why doesn't irony go rusty?
  • Why doesn't methane and oxygen spontaneously combust?
  • Why doesn't salt water freeze?
  • Why doesn't the temperature in the calorimeter doesn't increase greatly if the nail is dropped into it ?
  • Why don't carboxylic acids undego aldol reactions?
  • why don't the O2 and H2 react immediately as soon...?
  • Why don't you burn when you enter a sauna that is hotter than 100 degrees celsius?
  • why efficiency of hcp and ccp packing have same efficiency even though they have different kinds of voids??
  • why electron has negative charge?CAN U TELL?
  • why ethanol (Ch3--CH2OH) dissolves in water but ethane does not?
  • Why exactly does blue litmus paper turn red when it touches acidic solutions?
  • why fats are soluble in organic solvents but not in water?
  • why Fe prodduces Fe2+ ion instead of Fe3+ while rxn with HCl?
  • why glass is liquid state (super cooled liquid) ,not solid?
  • why glycerol is more viscous than ethanol?
  • Why glycogen undergo phosphorlysis instead of hydrolysis?
  • Why graphite being a good conductor of electricity is a bad conductor of heat whereas diamond being a bad cond
  • Why hasn't Ethanol Been used as a fuel Source?
  • Why have most iranians i've met been very untrustworthy?
  • why HBr is a stronger acid than HIO?
  • Why HF (hydrogen fluoride) is not soluble in water?
  • why hydrogen is placed at two plase in chemical table?
  • Why I3 mono-negative ion is formed but F3 mono-negative ion is not formed?
  • why in equivalent weight of an element there need the concept of part of it by weight ?
  • why iodine has metallic lustre?
  • Why is 0.1 M CH3COOH acidic and 0.1 M CH3COONa basic?
  • why is a log graph more accurate than other graphs in general?
  • why is a piece of zinc sometimes bolted to a car body? why must it be carefully sited if it is to work?
  • Why is a sodium carbonate solution more alkaline than a sodium bicarbonate solution?
  • Why is a zinc screw rusting?
  • why is acetone a good last rinse solvent for copper drying?
  • why is ALCL3 is covalent bond while ALF3 is ionic bond?
  • why is ammonia a weak acid ?
  • why is ammonium chloride best suited for a cold pack?
  • Why is an input of energy needed when forming NaCl?
  • why is Au, Ag and Pt commonly used for making jewlery considering their position on the reactivity chart?
  • Why is baking soda basic?
  • why is benzaldehyde, glucose and starch not soluble in water?
  • Why is boiled de-ionized water essential for the titration of acids and bases?
  • why is bs1192 useful?
  • Why is buffering ability of water important?
  • Why is Butane a liquid inside a lighter?
  • why is calcium chloride ionic? ammonia is non polar? and carbon tetrachloride is polar?
  • why is carbon considered a unique element?
  • Why is carbon dioxide considered as a waste product even though it is eliminated from the body by the lungs?
  • why is carbon dioxide gas at room temperature?
  • Why is carbon dioxide used in fire extinguishers?
  • Why is chemistry considered a basis for all science?
  • Why is compressed air cold?
  • why is copper and gold coloured?
  • Why is cream whipped before it is used in cakes and desserts?
  • Why is diethylether superior to hexane fro caffeine extraction from aquesous solution?
  • why is egg white used as antidote for lead or mercury poisoning?
  • Why is energy released during combustion?
  • why is entropy not proportionl to temperture???
  • why is eriochrome black t used n the estimation of aluminium?
  • why is ethanol is added to car petrol in brazil?
  • Why is ethanol is added to car petrol in brazil?
  • why is fire funny?
  • Why is flame emission photometry particularly useful for the determination of alkali and alkaline earth metals
  • Why is flouride in your drinking water dangerous?
  • Why is Fluorine gas at normal room temperature?
  • why is foam a good insulator?
  • Why is fructose more fattening than glucose?
  • why is golden syrup a liquid while sugar is a solid?
  • Why is H2O a liquid but CO2 a gas ?
  • Why is helium considered the ideal gas?
  • Why is hydrogen peroxide a stronger bronsted acid than water? is the aqueous solution of H2O2 acidic or basic?
  • why is hydrogen sometimes classed with the group 1 metals in periodic table?
  • Why is hydrogen sulphide gas at room temperature whereas water is a liquid boiling at 100 oC?
  • Why is it a bad idea to freeze water in a plastic container?
  • Why is it acceptable for propanol to be v/v%, but not ethanol?
  • why is it carbon having a high catenation ability?
  • why is it dangerous to react potassium withdilute hydrochloric acid and what happens?
  • Why is it difficult to find a completely covalent compound? What can the shape of a molecle affect?
  • Why is it important that a chemical equation be balanced?
  • Why is it important to keep volume and temperature constant in the initial rate reaction method?
  • Why is it important to learn about atoms?
  • why is it impossible to learn chemistry by ourself?
  • why is it incorrect to say that an object contains heat?
  • why is it necessary to calibrate a thermometer and volumetric glassware?
  • why is it necessary to make periodic chemical and bacteriological analysis of water used for drinking?
  • Why is it necessary to use parenteses in writing the formula for zinc phosphate?
  • Why is it not possible to eliminate the hazard of nuclear waste by the process of incineration?
  • Why is it that according to le chatelier's principle, heat will favour an endothermic reaction?
  • why is it that lead iodide and potassium nitrate forms when lead nitrate is mixed with potassium iodide?
  • Why is it that the water droplets form on the outside of a beaker containing an ice bath??
  • why is it that we use milk or albumin as an antidote for heavy metal poisoning?
  • Why is it that when you shake a container with different sized pieces, do the larger pieces go to the top?
  • Why is it unsafe to acid to bleach?
  • Why is KNO3 completely ionized in water?
  • Why is kyrpton used in photographic flash lamps, gas discharge lamps and fluroescent lamps?
  • why is lead iodide insoluble?
  • Why is lemon juice made with artificial flavor, and dishwashing liquid made with real lemons?
  • Why is less caffeine actually isolated during an extraction than suggested by the formula K=C1/C2?
  • Why is mercury blue somtimes and silver another?


  • Page [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] [129] [130] [131] [132] [133] [134] [135] [136] [137] [138] [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] [149] [150] [151] [152] [153] [154] [155] [156] [157] [158] [159] [160] [161] [162] [163] [164] [165] [166] [167] [168] [169]