Chemistry Questions and Answers

  • Which ONE of the following gives the bond orders of O2+ & O2 respectively? & how is bond order calculated?
  • which ones are exact numbers?
  • Which Organic Chemistry compound is more stable cyclopentadiene or imidazole?
  • Which out of the following metals produces the greatest temperature rise when reacting with hydrochlorid acid?
  • Which pH indicator solution turns from colourless to blue at pH 9 and below ?
  • Which pH would denature the enzyme catalase?
  • which possesses more kinectic energy, n2 liquid or n2 gas at its boiling point? Explain?
  • Which processes with the following ΔH, ΔS and T values are spontaneous at constant T and P ?
  • Which processes with the following ΔH, ΔS and T values are spontaneous at constant T and P ?
  • Which processes with the following ΔH, ΔS and T values are spontaneous at constant T and P ?
  • Which processes with the following ΔH, ΔS and T values are spontaneous at constant T and P?
  • Which processes with the following ΔH, ΔS and T values are spontaneous at constant T and P ?
  • Which processes?
  • Which properties of air are instrumental in propelling a sailboat?
  • Which reaction will produce more energy and why?
  • Which role did Vitriol play in Alchemy?
  • Which set of coefficients balances the following chemical equation?
  • Which soda make a nail rust faster and has more acid Mountain Dew or Coca Cola?
  • Which statement concerning compounds is true?
  • Which statement concerning decomposition is true?
  • Which statement is incorrect?
  • Which statements are true about the proposed Lewis structure shown above for the molecule [HCNH]+?
  • Which substances form the liquid for the breaks of the cars?
  • which symbol in the periodic table is named after an emperor?
  • Which term correctly identifies rubidium?
  • which Thin-Layer Chromatography plate give he best separation; aluminium,plastic or glass plate?
  • which Thin-Layer Chromatography plate give the best separation; aluminium,plastic or glass plate?
  • which transfer heat faster, solid or liquid?
  • Which two acids are needed to make Aqua Regia (a chemical to dissolve noble metal like gold,siver etc)?
  • Which type of radiation has the highest energy?
  • Which type of scientist makes use of the reaction of carbonates with acids?
  • Which will clean 18 karat gold best, vinegar, baking soda, or isopropyl alcohol?
  • which will react faster with water?
  • Which would become room temperature quicker?
  • Which would form the stronger chemcial bond? and why?
  • which would not be a good insulator of electricity?
  • Which,among H3PO4 & HCl, is more volatile and why?
  • Who Are Some Famous Chemists?
  • who can help me in my chemistry A2 practical ?
  • who carbon neutralises?
  • Who developed the law?
  • who discoverd carbon??
  • who discovered einsteinium and when did they discover it?
  • Who discovered Helium?
  • Who discovered phenol?
  • Who discovered platinum?
  • Who discovered that water is wet?
  • who found the metal aurum?
  • Who invented blowing bubbles?
  • who invented neutron?
  • Who invented soap and when?
  • Who invented the new and improved gas heating furnace in 1919 that provided central heating?
  • Who invited Plane and Bicycle?
  • Who is Linus Pauli?
  • who is the discover of sodium?
  • Who is the most intelligent man in 21st century?
  • who is ur favourite actress n actor??
  • who knows how to build a fire if you were stranded in the woods?
  • Who Made Chemistry Discoveries?
  • Who named copper?
  • Who named group 16, chalcogens, and why?
  • Who split the atom?
  • Who thinks science has become too over exagerated?
  • Who was Henry George Smith?
  • Who was the Bunsen burner invented by?
  • who was the peron who discoverd mercury the element?
  • Who where the first people to use acetylsalicylic acid?
  • Whoever's good with chemistry?
  • whos good at science its has to do with acids and baces?
  • Who's Lui Paster?
  • who's really good??
  • Whose Dr Maseru Emoto?
  • wht do i get shock everytime i touch the car door or any thing with metal?
  • why doesn't a nail melt when under a burning flame?
  • why some ionic solids soluble and others are not ?
  • Why 18 carats gold rolex is reacting with white shirt sleeve leaving black permament stains?
  • Why 2-methyl-2-pentanol dissolved in distilled water?
  • why a first order reaction can't undergo 100% completion?
  • why all humanbings are not stisfied with which the material they have?
  • why alloy is harder, stronger, less ductile and less malleable than its pure metal?
  • why and when does copper attract rice and vanishes when kept on a mirror by melting the mercury of the mirror?
  • Why are water- insoluble alcohols significantly soluble in HCL?
  • Why are aerosol cans cold to the touch?
  • Why are amino acids least soluble at their isoelectric point?
  • Why are certain elements in the PeriodicTable classified as 'P-block' elements?
  • why are clouds white?and about snows.why are they white?
  • Why are elements considered Homogeneous?
  • Why are elements of the Noble gases very unreactive? Explain.?
  • why are enzymes sensitive to temperature and pH changes?
  • why are fatty acids insoluble in water?
  • why are foods frozen at a room temperature below zero?
  • Why are free nucleotides significant to the living cell?
  • Why are group 8 elements, in the periodic table, called Noble Gases?
  • why are halogens so reactive?
  • why are insoluble amines odourless(those that are insoluble in water)?
  • Why are ionic substances easily dissovled in Water?
  • Why are matallic hydroxides such as NaOH much more caustic(corrosive) than alcohols?
  • Why are molecules somtimes attain three-dmensionl spapes rather then flat?
  • Why are neutrons present in the nucleus only?
  • Why are noble gases important? What's its reactivity?
  • why are rates of reactions faster when there is a bigger surface area or concntration or temprature?
  • Why are soap bubbles round?
  • why are sodas bottled at a certain temperature and pressure?
  • Why are solutions important in medicine?
  • Why are some Elements on the Periodic table reactive when others aren't?
  • Why are standard conditions used in the standard formation enthalpy change?
  • why are systematic names preferred over common names?????
  • why are tennis ballls sold in pressurized containers?
  • Why are the carbon-hydrogen tails of phospholipids (or any lipids for that matter) hydrophobic?
  • why are the substances: glucose, octanol, and glycerol.?
  • Why are these compounds different at m/e=86 in the mass spec?
  • why are water molecules are attracted to each other? give one reason.?
  • why are weak acids and weak bases poor electrical conductors?
  • Why are, say, water and Carbon Dioxide in different states (liquid/gas) at the same temperature...?
  • Why arent the atomic masses of elements whole numbers?
  • why armchair carbon nanotubes is conductive?
  • why artificial polymers are so much more important than they used to be?
  • why barium sulfate is precipitated using sulphamic acid but strontium sulfate is precipitated using NH4SO4?
  • why benzaldehyde shows negative result in Tollen's test?
  • why boiler water becomes orange in color?
  • why boiling point of 1,2- ethandiol is higher than 2-propanol?
  • why can hydrogen and carbon (H-C) bond be polar and nonpolar?
  • Why can phosphorus -32 detect the presence of nucleic acids?
  • Why can you NOT set fire to water?
  • Why can't ionic compounds conduct electricity while in their solid state?
  • Why can't liquid gasoline burn?
  • Why can't liquid gasoline burn?
  • Why can't the resin in cation-exhange chromatography dry up?
  • why can't to negative or positive ions joined?
  • why can't we use alkaline batteries in small devices???
  • Why can't we use isopropyl alcohol for fuel?
  • Why cant you just reheat food and then re freeze ad infintum?
  • Why can't you use mineral oil to determine the melting points of compounds with high boiling points?
  • Why can't/doesn't water change it's volume?
  • why carbon dioxide belongs to inorganic chemistry not organic like another carbon compounds?
  • Why carboxyllic acid have higher boiling points that esters of the similar size?
  • why cause ionic radii to be smaller or larger?
  • Why Chlorine (Cl) inactivate the benzine ring, though it is an ortho-para director?
  • Why Chromium (III) Oxide is resistant to corrosion?
  • Why cyclohexene has lower melting point than cylcohexane?
  • Why did JJ Thomson believe that electrons were present in the atom of all elements??
  • why did my fake gold material turned silver and then after a week, it turned gold again?
  • Why did the can Crush?
  • Why did the Element Zinc get it's name, and how?
  • Why did the nail rust in the distilled but not salted water?
  • Why didn't Mentos make a big reaction with a 16oz bottle of coke and diet coke?
  • Why do aldehydes streak on TLC? Do sugars (eg glucose) usually streak on TLC?
  • why do atoms bond other than to become stable?
  • why do atoms form bonds? i know to becum stable but what else?
  • why do atoms form chemical bonds?
  • Why do bubbles in a glass of Champagne start at the bottom?
  • Why do butane and 2-methylpropane have different boiling points?
  • why do candles give off some black smoke when they flicker?
  • why do chemical reactions give off hydrogen?
  • Why do chemical reactions slow down?
  • why do copper objects get coated with green coloured substance when kept in air?
  • Why do covalent compounds not conduct electricity like ionic ones do?
  • why do diferent atoms of the same element always have the same atomic number but can have diferent mass number
  • Why do different substances show different spectra?
  • Why do different types of matter freeze and boil at different temperatures?
  • why do divers use helox(a helium/oxygen mix) for deep dives?
  • why do electrons flow through some solids and not other?
  • why do fats develop rancid odor?
  • Why do green mangoes lose water and shrink when pickled in brine solution?
  • why do green mangoes shrink in brine solution? what are the factors that contribute to this phenomenon?
  • Why do hard boiled eggs tarnish silver?
  • why do ices cubes shrink and become round if left in the freezer for a long time?
  • why do impurities lower freezing point of a liquid?
  • why do lipids solve in 70% alcohol better than 95% alcohol?
  • Why do metals react more violently with dilute acid than concentrated acid?
  • Why do molecules that gain an electron often gain a proton as well?
  • Why do most atoms need 8 electrons in their outer shell to be stable?
  • Why do native proteins fold so their hydrophobic groups are directed towards the center of the structure?
  • Why do onions smell even through a plastic bag after you leave them in the refrigerator? Something with gases?
  • Why do only temperature change affect the equilibrium constant in an equilibrium expression?
  • Why do organic chemists use NMR? What is NMR?
  • Why do para subsituted benzene show 4H double doublet on H NMR?
  • why do people in Jamaica wear white clothing and the desert nomads in Africa wear black clothing?
  • Why do polar molecules have a larger dielectric constant?
  • Why do properties of alloys usually become superior to their constituent components?
  • Why do reactions speed up when the reactants are more concentrated?
  • why do resorcinol reagent binds with fructose but not glucose?
  • Why do rubbers bloat when saoked with kerosene?
  • why do rubbers bloat when saoked with kerosene??
  • Why do rubbers bloat when soaked with kerosene for few days?
  • why do rubbers loat when saoked with kerosene??
  • Why do scientists use STP and standard units?
  • Why do scientists usually want to speed up reactions?
  • why do soap and other detergents show surface active properties?
  • why do some compunds have a higher melting point then others?
  • why do some experiments fizz?
  • why do some explosive mixtures oxidise faster than others?
  • Why do some hydrates effloresce?
  • why do some isotopes of elements spontaneously undergo radioactive decay?
  • Why do some solutions make such good conductors?
  • Why do steel blocks produce water when you put fire to them? Like for jewelers.?
  • Why do straight-chained alkanes have higher boiling points than alkanes with branched chains?
  • Why Do Students Fail Chemistry?
  • why do the sugar crystals reform when the water is taken away?
  • Why do they have these boiling points?


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