Chemistry Questions and Answers

  • A ____ acid is only very slightly dissociated in solution.?
  • A 0.100 M solution of an unknown monoprotic weak acid, HA, is 2.40% ionized. What is the value of Ka for HA?
  • A 0.12 M solution of acetic acid, CH3COOH, has a pH of 3.0. What is the Ka of the CH3COOH?
  • A 0.12 M solution of acetic acid, CH3COOH, has a pH of 3.0. What is the Ka of the CH3COOH?
  • A 0.30 M Solution of weak acid, HA, is ionized. The ionization constant, Ka, for HA is...?
  • A 1,000-gram mass of water in a calorimeter has its temperature raised by 4.0'C while an exothermic chemical
  • A 1.2516 g sample of a mixture of CaCO3 and Na2SO4 was analyzed by dissolving the sample and completely precip
  • A 100 ml solution that is 0.02M in Na+ can be prepared by adding how many g of Na2SO4 to water to final 100 ml
  • A 100mL solution of 0.333M solution hydrogen oxalate (NaHC2O4) is titrated with 0.400M KOH?
  • A 11.2 kg sample of shark meat contained 14 mg of methyl mercury, CH3Hg+.?
  • A 15.0-g sample of an unknown metal is heated to 95.5掳C and is placed in a coffee cup calorimeter containing 1
  • A 187 g sample of gold at some temp is placed in a constant pressure calorimeter with 30 g of water at...?
  • A 2,000-gram mass of water whose temperature was 50'C lost 7,000 clories of heat over a 5-minute person. What
  • A 2.00 L bottle contains N2 gas at pressure of 4.80 atm.?
  • A 2.0-gram sample of glass was heated from 10'C to 50'C, and was found to have absorbed 32 J of heat. What is
  • A 2.5 x 10-5 M solution of an acid has a pH of 2.50 at 25掳C. What is the equilibrium constant for this acid?
  • A 25.0 mL sample of acid is titrated against 1.4 M NaOH. What is the pH after 5 mL of base has been added?
  • A 25.0 mL sample of the acid is titrated against 2 M NaOH.?
  • A 25.0 mL sample of the base is titrated against 0.55 M HCl.?
  • A 4.40 L container holds 15.4 g of oxygen at 22.55掳C. What is the pressure?
  • A 4.40 L container holds 15.4 g of oxygen at 22.55掳C. What is the pressure?
  • A 4.5 mol sample of gas occupies a volume of 34.6 L at 298K.?
  • A 5 gallon water bottle filled with penny's, how much money is in the bottle?
  • A 50.0-g sample of liquid water at 25.0 C is mixed with 29.0 g of water at 45.0掳C. The final temp of water 掳C
  • A 7.00 10-2 M solution of unknown monoprotic weak base has a pH of 9.400.?
  • A 7.85 x 10^-5 mol sample of copper-61 emits 1.47 x 10^19 positrons in 90 minutes. What is the decay constant
  • A 70 kg person uses 227.0 kJ of energy to walk a kilometer. This energy comes from ``burning'' glucose, but on
  • A 75.0 L. tank at 20.0 degrees C contains acetylene (c2h2m.w.=26g/mol) at a pressure of 139 atm. how many gram
  • A 9.24-g sample of barium hydroxide is dissolved and diluted to the mark in 275.0-ml volumetric flask.?
  • A 9.30-g sample of calcium hydroxide is dissolved and diluted to the mark in 250.0-ml volumetric flask.?
  • A 9.40-g sample of barium hydroxide is dissolved and diluted to the mark in 250.0-ml volumetric flask.?
  • A 9.70-g sample of calcium hydroxide is dissolved and diluted to the mark in 250.0-ml volumetric flask. It was
  • A bath makes us think of ideas? water does?
  • A beaker of acid measures 4 PH. If water is added the resultant PH will increase or remain the same?
  • A bottle of water has .035g of sodium chloride. What mass of silver nitrate is required to react to .035g NaCl
  • A breath of air has a volume of 3.05 l at a pressure of 750 mmHg and body temp of 37 C. Calculate the number?
  • A buffer solution can be prepared by mixing a ____ in required proportions?
  • A buffer solution is prepared by dissolving 27.22 g of KH2PO4 and 3.37 g of KOH what is the ph?
  • A buffer solution made with NH3 and NH4 has a pH of 10. Which procedure(s) could be used to lower the pH?
  • A buffered solution is made by adding 50.g NH4CL to 1.L of a .75M soln of NH3 calc the pH of the final soln?
  • A bunch of AP Chem questions! HELP!?
  • A calorimeter contains 25 g of water at 23.8 degrees C. A 5 g hot metal at 78.3 deg. C is dropped into the?
  • A candle burning in air (20% oxygen) is tranferred to an atmosphere of 100% pure oxygen. What is the speed of?
  • A carbon-carbon triple bond is formed in the same way as a double bond:?
  • A car's exhaust pipe will rust faster if used a lot; why?
  • A certain buffer is made by dissolving NaHCO3 and Na2CO3 in some water. Write equations to show how this?
  • A certain element commonly has 8 protons, 8 neutrons, and 8 electrons. Select the combination of particles...?
  • A certain gas effuses 4 times as fast as oxygen gas. What is the molar mass of the unknown gas?
  • A certain isotope has an atomic number of 49 and a mass number of 99.?
  • A certain mine produces 2.0e8 kg of copper from (CuFeS2) each year. The ore contains only .70% Cu by mass.?
  • A certain mine produces 2.0e8 kg of copper from (CuFeS2) each year. The ore contains only .70% Cu by mass.?
  • A chem redox experiment to tell if the active ingredient in bleach has decomposed?(2HClO -> O2 + 2HCL)?
  • A Chemical Reaction..?
  • A chemist claims to have found a complex ion where the most intensely absorbed light is 400.0 nm?
  • A chemist claims to have found a complex ion where the most intensely absorbed light is 413.0 nm. Estimate the
  • A chemist claims to have found a complex ion where the most intensely absorbed light is 451.0 nm.?
  • A chemist claims to have found a complex ion where the most intensely absorbed light is 491.0 nm. Estimate the
  • A chemist claims to have found a complex ion where the most intensely absorbed light is 495.0 nm?
  • A chemist claims to have found a complex ion where the most intensely absorbed light is 504.0 nm. Estimate the
  • A chemist claims to have found...?
  • A chemist finds a complex ion; the most intensely absorbed light is 414.0 nm.Crystal field splitting energy?
  • A Chemistry concentration/conversion question?
  • A chemistry question about ice changing to water and the amount of joules of heat energy required?
  • A chemistry question regarding Kb values of NH3?
  • A chemistry question.......??
  • A chemists determines that a sample of petrified wood is 1.00 X 103 years old. What is the rate of decay, in c
  • A Chemitry COMPETITION?
  • A chmist reacts 140 g of calcium oxide with water. calc the percent yield she produces 151g...?
  • A company is investigating using sodium sulfide to precipitate a 120000gpd waste water containing 60mg/lPb2+45
  • A compound contain 1.0 g Ca and 1.775 g Cl What is the empirical formula for it ?
  • A compound contains 0.219g Ca , 0.0630g C and 0.252g O . Whit is the Empirical Formula for it ?
  • A compound contains 2.00 g C ,0.500g H and 2.67g O .what is the empirical formula and molrculer formula for it
  • A compound is formed when ___ __ ____ elements react chemically?
  • A compound of vanadium has a magnetic moment 1.73BM. Work out the electronic configuration of vanadium ion.?
  • A correct ranking of elements in order of decreasing electronegativity is:?
  • A couple questions concerning ethanol and/or TLC?
  • A definition based on directly observable properties is?
  • A detergent solution has a pH of 11.63 at 25C. What is the hydroxide ion concentration?
  • A easy chemistry question?
  • A few Chemistry questions?
  • A Few Entropy Questions! Help Needed.?
  • A few questions if a solution has [Cu+] = 4.5 x 10^-5 and [Br-] = 3.4 x 10^-5, and Ksp of CuBr is 5.3 x 10^-9?
  • A few questions on Chemistry?
  • A flame can burn with carbon,hydrogen combination[CH3..]and with oxyzen[O2].why it will put off with that CO2?
  • A flask that weighs 345.8 g is filled w/ 225 mL of carbon tetrachloride. The weight of the flask and carbon?
  • A galvanic cell that does not require a battery souce yet transfers electrons?
  • A gas at a pressure of 10.0 Pa exerts a force of __________ N on an area of 5.5 m2.?
  • A gas at a pressure of 2.0 atm is contained in a closed container.?
  • A gas at a pressure of 35.6 p.s.i. is held in a flexible container with an initial volume of 560mL. Calculate?
  • A gas gas a volume of 2.8 L at a temperature of 27 degrees celcius. what temperature (C) is needed to expand?
  • A gas has a volume of 4.00 L at 0掳C. What final temperature in degrees Celcius?
  • A gas occupies 21 L at 1 atm pressure and 298 K.. (question about pressure if volume is increased)?
  • A gas occupies 900.0mL at a temperature of 27.0 Celsius. What is the volume (in L) at 132.0 Celsius?
  • A gas sample collected at 35 degrees C and a pressure of 710 torr?
  • A gas sample has a volume of 135mL @ 0.600atm.What's the volume if pressure is decreased to 0.200 @ constant
  • A gas with a volume of 525mL at a temperature of -25 degrees celcius is heated to 175 degrees celcius. what is
  • A given atom has an atomic mass of 23 and an atomic number of 11.?
  • A hydrate that has the general formula Co2(SO4)3.?
  • A hydrogen ion H+ is the same as?
  • A list of thermosetting plastics in the home?
  • A liter of water has 10 -4 mol of hydroxide ions.?
  • A litmus paper that is blue will turn/stay what color in the presence of a strong base?
  • A litmus paper that is blue will turn/stay what color in the presence of a strong base?
  • A little help please..?
  • A little help please..?
  • A long question?
  • A magnesium atom has 12 elect. When it reacts, it loses 2 electrons. How does this loss make magnesium stable
  • A magnesium atom has 12 electrons. When it reacts, it usually loses two electrons. How does this loss make mag
  • A milk mixture must be cooled to produce ice cream.Is freezing an exothermic reaction or an endothermic react.
  • A mixture contains 5.00 g each of O2, N2, CO2, and Ne gas. Claculate the volume of this mixture at STP?
  • A mixture of gases at 25 C and 1 atm pressure contains 10.0 L of oxygen, 20.0 L of nitrogen,?
  • A mole of jellybeans would fill up how many buildings the size of the C.N tower?
  • A molecular substance whose water solution conducts electricity is?
  • A monatomic ion has a charge of +2. The parent atom has a mass number of 55. If the number of neutrons in...?
  • A mother, obviously in panic, brings her infant who is feverish, hyperventilating and cyanotic to the clinic.?
  • A need help writing a chemcial equation.?
  • A negative subatomic particle which is about equal in mass to the proton is?
  • A package of compounds used to achieve rehydration in sick patients contains 20.2 g of glucose, C6H12O6...?
  • A patient received 1.4 g of NaCl in 8 hours. How many milliliters of a 0.94% (m/v) NaCl (saline) solution were
  • A patient with polycythemia vera (excess production of red blood cells) receives radioactive phosphorus-32.?
  • A person standing behind a thick lead screen would be protected from?
  • A piece of unknown metal w/ a mass of 23.8 g is heated to 100.0 degrees celcius and dropped into 50.0 ml of...
  • A potential difference of 1.1068 is produced in an electrolysis set-up with the two half cell elements of?
  • A potential difference of 1.1068 is produced in an electrolysis set-up with the two half cell elements of?
  • A qauntity of 15.4 g of hydrogen held in container at temp of 56 celcius & pressure of 0.09 atm.?
  • A quantity of a gas occupies 61.3 mL at 68 C. if pressure remains constant, what is the volume @ 17 C?
  • A question about E2 mechanism?
  • A question about ligands?
  • A question about science?
  • A question about science?
  • A question about the Periodic Table?
  • A question concerning nuclear chemistry!?
  • A question on dilutions?
  • A quick question on silicones!?
  • A reaction will be spontaneous if it has a.?
  • A redox reduction can also be called?
  • A road map problem. Compound A was hydrolyzed with H2O and a little acid to produce CH3NH2 and compound B.?
  • A rock salt (NaCl), ice, and water mixture is used to cool milk and cream to make homemade ice cream. How many
  • A salt MCl2 has a Ksp of 1.12脳10-24. What is its solubility?
  • A salt MCl2 has a Ksp of 1.12脳10-24. What is its solubility?
  • A salt MCl2 has a Ksp of 1.12脳10-24. What is its solubility?
  • A sample of coal is burned in a bomb calorimeter with a heat capacity of 4.62 J/g degrees C. The temp in ...?
  • A sample of gas at 38.0 degrees celsius occupies a volume of 2.97 L and exerts a pressure of 3.14 atm.?
  • A sample of gas in a 10.0L container exerts a pressure of 1.2 atm.?
  • A sample of gas measures 2.5 liters @ 298K.what will be its volume when its temp is changed to 268K?
  • A sample of gas occupies 17 L under a pressure of 1.3 atm?
  • A sample of methane (CH4) has a volume of 25 mL at a pressure of 0.68 atm.?
  • A sample of natural gas at STP is 78% CH4 and 22% C2H6 by volume. How much heat is produced from the ...?
  • A Sample of neon occupies a colume of 27.3L at STP. What would be the neon volume at 177 degrees Celcius and?
  • A sample of nitrogen dioxide has a volume of 28.6L at 45.3掳C and 89.9 kPa. What is its volume at STP?
  • A sample of Nitrogen gas is collected over water at temperature of 23 degrees cekcius. What is the pressure o
  • A sample of nitrogen occupies a volume of 250ml at 25*C. What volume will it occupy at 95*C?
  • A sample of tungsten carbide (WC) has a volume of 11.2 cm cubed. The sample has a density of 15.6 g/cm cubed.
  • A saturated solution of which compound has the lowest (Ca2+)?
  • A science fair pro...?
  • A sealed container with gas at 2.00 atm is heated from 20.0K to 40.0K.What's the new pressure?
  • A short precipitation reaction question.?
  • A simple chemical test to identify an alcohol?
  • A simple chemistry question!! 5 points for the best answer!!!?
  • A simple explanation is required?
  • A single covalent bond results from a pair of what ?
  • A solid (state of matter) model. I NEED HELP!!!?
  • A solid substance w/ a mass of 200 g is at its melting point temp. in a calorimeter. While the substance...?
  • A solid whose solubility decreases with increasing temperature is?
  • A solution at equilibrium is called a(n) __________ solution.?
  • A solution containing a comparatively small amount of solute (for example 3% or 10% by weight) in solution.?
  • A solution contains 32.5 g H3PO4 in 447 mL of solution. Calculate its molarity.?
  • A solution contains 6.52g of NaOH in 135 ml of solution. what is the concentration of molar (M)?
  • A solution has [OH-] = 2.0 x 10^-14 M. The [H+] in this solution is?
  • A solution has [OH-] = 2:0 x 10-14 M. The [H+] in this solution is?
  • A solution has a pH of 4.20.?
  • A solution is labeled 0.287 m NaCl. What are the mole fractions of the solute and solvent in this solution?
  • A solution is prepared by dissolving 7.00 g of glycerin (C3H8O3) in 201 g of ethanol (C2H5OH).?
  • A solution is prepared by mixing 50.0 mL of 0.100 M HCl and 10.0 mL of 0.200 M NaCl.?
  • A solution is prepared by mixing 50.0 mL of 0.33 M Pb(NO3)2 with 50.0 mL of 1.5 M KCl.?
  • A solution of calcium nitrate contains 2.05 grams of solute in 252 grams of water?
  • A solution of tin (IV) sulfate is added to a solution of iron (II) sulfate, what are the products?
  • A solution that contains a low concentration of solute must be?
  • A solution that contains more solute than it can hold normally under the same conditions of temperature?
  • A solution that is about 20 molal?
  • A solution was made by dissolving .428 g Ba(OH)2 in .23 L final volume. What's the molar concentration of OH-?
  • A Specific Heat Question?
  • A square foot of gold foil contains 0.01 mol. How many atoms of gold are there in this square foot?
  • A starting compound with the molecular formula C10H16 is reacted with KMnO4 conc.& warm yields Cyclopentanone?
  • A steady current was passed through molten CoSO4 until 1.51 g of metallic cobalt was produced.?
  • A strong electrolyte is one that __________ completely in solution.?
  • A student placed a mixture of BaO and CaO of combined mass 4.88g in a flask containing carbon dioxide gas.?
  • A student prepares a solution by dissolving 3.98 g of NaOH in enough water to make 300. mL?
  • A student prepares a solution by dissolving 5.79g of NaOH in enough water to make 300mL of solution.?
  • A substance (usually a liquid) which dissolves another substance is called a ____________?
  • A substance that is involved in changing the rate of a chemical reaction without undergoing change of its own?
  • A substance with a density of 0.5282 g/cm3 occupies a volume of 3.047 cm3. What is number of Atomic Mass Units
  • A synthesis reaction between Mg and O2 might produce what?
  • A volatile liquid is one that?
  • A weak acid ,HA,has a ka of 1.00 x 10^-5 .if 0.100mol of this acid is dissolved in one litre of water,?
  • A weak acid has pKa of 7.48. If the solution pH is 7.132, what % of the acid is "undissociated"?
  • A weather balloon with a 2-meter diameter at ambient temperature holds 525 grams of helium. What type of elect
  • A zinc powder is added to a solution of copper(II) sulfate. whats the net ionic equation?
  • A(n) ________ mixture has components that are not easily distinguishable.?
  • A) How many unpaired electrons are in the d-orbital splitting diagram for the octahedral complex ion of?


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