Chemistry concepts and calculations
117302 questions • Page 1994 / 2347
When a fresh, uncooked beef roast is sliced into two, the surface of the meat fi
When a fresh, uncooked beef roast is sliced into two, the surface of the meat first appears purplish but then turns red. Explain why. Why does meat turn brown when it is cooked? W…
When a gas is heated, it absorbs 167 joules of heat from the surroundings. At th
When a gas is heated, it absorbs 167 joules of heat from the surroundings. At the same time, the gas expands, doing pressure-volume work (P · V work) on the surroundings that is e…
When a gas is heated, it absorbs 167 joules of heat from the surroundings. At th
When a gas is heated, it absorbs 167 joules of heat from the surroundings. At the same time, the gas expands, doing pressure-volume work (P · V work) on the surroundings that is e…
When a gas was heated at atmospheric pressure and 25 degree C, its color deepene
When a gas was heated at atmospheric pressure and 25 degree C, its color deepened. Heating above 150 degree C caused the color to fade, and at 500 degree C the color was barely de…
When a graph of energy vs. reaction progress was graphed for the reaction A + B
When a graph of energy vs. reaction progress was graphed for the reaction A + B rightarrow C + D, the following data was obtained: a) Draw a rough sketch of what this activation e…
When a lead acid car battery is recharged by the alternator it acts essentially
When a lead acid car battery is recharged by the alternator it acts essentially as an electrolytic cell in when solid lead (I) sulfate (Pbso_4) is reduced to lead at the cathode a…
When a liquid sample is taken from sea level to a higher elevation, what happens
When a liquid sample is taken from sea level to a higher elevation, what happens to the external (atmospheric) pressure on the liquid and the boiling point of the liquid? pressure…
When a magnetic sector instrument was operated with an accelerating voltage of 2
When a magnetic sector instrument was operated with an accelerating voltage of 2500 V, a magnetic field of 0.4 Tesla was required to focus on the CH4+ on the …
When a magnetic sector mass spectrometer was operated with an initial accelerati
When a magnetic sector mass spectrometer was operated with an initial accelerating voltage (V1) of 3.00 x 103 V, a magnetic field (B1) of 0.126 T was required to focus the CH4 + i…
When a material in the liquid state is vaporized and thencondensed to a liquid,
When a material in the liquid state is vaporized and thencondensed to a liquid, the steps in the process are,respectively, A. exothermic and exothermic B. exothermic and endotherm…
When a mechanism has been investigated in detail, it can be understood on many l
When a mechanism has been investigated in detail, it can be understood on many levels of differing detail. An additional detail about addition of hydrogen halides to alkenes in no…
When a metal and a nonmetal react, the nonmetal becomes a(n) ____________ and th
When a metal and a nonmetal react, the nonmetal becomes a(n) ____________ and the metal becomes a(n)_____________. The nonmetal is _________________ and the metal is _____________…
When a metal and a nonmetal react, the nonmetal becomes a(n) ____________ and th
When a metal and a nonmetal react, the nonmetal becomes a(n) ____________ and the metal becomes a(n)_____________. The nonmetal is _________________ and the metal is _____________…
When a metal ion has a coordination number of 2, what are the observed geometrie
When a metal ion has a coordination number of 2, what are the observed geometries and associated bond angles? (Select all that apply.) Geometries: linear trigonal planar bent tetr…
When a metal ion in aqueous solution interacts with a monodentate ligand, the li
When a metal ion in aqueous solution interacts with a monodentate ligand, the ligand can displace water molecules coordinated to the metal center only when it is a stronger Lewis …
When a metal was exposed to light at a frequency of 3.01× 1015 s–1, electrons we
When a metal was exposed to light at a frequency of 3.01× 1015 s–1, electrons were emitted with a kinetic energy of 5.90× 10–19 J. What is the maximum number of electrons that cou…
When a method in a subclass has the same signature as a method in a superclass (
When a method in a subclass has the same signature as a method in a superclass (same name, same parameters and same return type) we say the that method in the subclass____________…
When a microscale extraction is carried out, which layer should be removed from
When a microscale extraction is carried out, which layer should be removed from a centrifuge (or a conical vial) first in order to separate the layers? aqueous layer should be alw…
When a minimum amount of aqueous ammonia is added to a test tube containing aque
When a minimum amount of aqueous ammonia is added to a test tube containing aqueous Co3+, a precipitate forms. When an excess of aqueous nitric acid is added to the same test tube…
When a mixture of 12.5 g of acetylene (C2H2) and 12.5 g of oxygen gas is ignited
When a mixture of 12.5 g of acetylene (C2H2) and 12.5 g of oxygen gas is ignited, the resultant combustion reaction produces carbon dioxide and water. What is the limiting reactan…
When a mixture of 12.5 g of acetylene (C2H2) and 12.5 g of oxygen gas is ignited
When a mixture of 12.5 g of acetylene (C2H2) and 12.5 g of oxygen gas is ignited, the resultant combustion reaction produces carbon dioxide and water. What is the limiting reactan…
When a mixture of 12.5g of acetylene (C2H2) and 12.5g of oxygen (O2) is ignited,
When a mixture of 12.5g of acetylene (C2H2) and 12.5g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H2O A. Write the balanced chemical equation for…
When a mixture of 12.5g of acetylene (C2H2) and 12.5g of oxygen (O2) is ignited,
When a mixture of 12.5g of acetylene (C2H2) and 12.5g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H2O A. Write the balanced chemical equation for…
When a muscle contracts anaerobically, more lactate accumulates than under aerob
When a muscle contracts anaerobically, more lactate accumulates than under aerobic conditions, because * muscle is more metabolically active under anaerobic conditions glycolysis …
When a narrow diameter glass tube is inserted into a body of water, water rises
When a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. Which statement, concerning the strength of …
When a neutralization reaction was carried out using 100.0 mL of 0.7550M NH3 wat
When a neutralization reaction was carried out using 100.0 mL of 0.7550M NH3 water and 100.0 mL of 0.7645M acetic acid, AT was found to be 4.66 degree C. The specific heat of the …
When a nonvolatile solute is dissolved in a liquid solvent, which of the followi
When a nonvolatile solute is dissolved in a liquid solvent, which of the following statements is true (select all of the true statements). a.The boiling point of the solution will…
When a nonvolatile solute is dissolved in a volatile solvent, the vapor pressure
When a nonvolatile solute is dissolved in a volatile solvent, the vapor pressure of the solvent over the solution increases as the mole fraction of solute increases. decreases as …
When a nonvolatilesolute is added to a volatile solvent, the solution vapor pres
When a nonvolatilesolute is added to a volatile solvent, the solution vapor pressure__________, the boiling point __________, the freezing point__________, and the osmotic pressur…
When a pair of electrons is shared between two atoms, acovalent bond is said to
When a pair of electrons is shared between two atoms, acovalent bond is said to have formed. Most often, the pair isformed (a) by excess valence electrons (b) as one atom contribu…
When a parameter is passed call by value, what functions are guaranteed to be ca
When a parameter is passed call by value, what functions are guaranteed to be called? a. zero-parameter constructor b. copy constructor c. destructor d. operator= e. two or more…
When a peeled apple Is exposed to air, it turns brown. This is because apple con
When a peeled apple Is exposed to air, it turns brown. This is because apple contains the enzyme o-diphenol oxidase which catalyzes the oxidation of phenols in the apple to quinin…
When a person drinks enough alcohol (beyond a rather low threshold), his alcohol
When a person drinks enough alcohol (beyond a rather low threshold), his alcohol dehydrogenase is essentially saturated - that is, the alcohol can only be cleared at a fixed, flat…
When a person exercises, muscle contractions produce lactic acid. Moderate incre
When a person exercises, muscle contractions produce lactic acid. Moderate increases in lactic acid can be handled by the blood buffers without decreasing the pH of blood. However…
When a person is given an intravenous fluid, the solute concentration in the flu
When a person is given an intravenous fluid, the solute concentration in the fluid must be matched to the solute concentration in the blood to avoid problems arising from a change…
When a person stands on tiptoe (a strenuous position), the position of the foot
When a person stands on tiptoe (a strenuous position), the position of the foot is as shown in figure (a). The total gravitational force on the body, vector F g, is supported by t…
When a photon of light hits the surface of a metal, a photoelectron may be emitt
When a photon of light hits the surface of a metal, a photoelectron may be emitted. Some of the energy of the photon is required to free the electron from the surface. The remaini…
When a photon of light hits the surface of a metal, a photoelectron may be emitt
When a photon of light hits the surface of a metal, a photoelectron may be emitted. Some of the energy of the photon is required to free the electron from the surface. The remaini…
When a piece of copper wire is placed in a colorless solution of silver nitrate,
When a piece of copper wire is placed in a colorless solution of silver nitrate, the surface of the wire becomes coated with a shiny silvery material, and the copper begins to for…
When a piece of magnesium is added to dilute hydrochloric acid fizzing occurs in
When a piece of magnesium is added to dilute hydrochloric acid fizzing occurs in hydrogen gas is released from the mixture fizzing is evidence that a ___________ has occurred betw…
When a piece of magnesium is added to dilute hydrochloric acid fizzing occurs in
When a piece of magnesium is added to dilute hydrochloric acid fizzing occurs in hydrogen gas is released from the mixture fizzing is evidence that a ___________ has occurred betw…
When a pink aqueous solution of potassium permanganate, faintly acidified with d
When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the ev…
When a process, they breathe very quickly, CO_2 more quickly than it can be prod
When a process, they breathe very quickly, CO_2 more quickly than it can be produced. This reduction the concentration of CO_2 in the blood. According to the chemical below and Le…
When a protein is folded into a stable conformation, its bond angles and atom lo
When a protein is folded into a stable conformation, its bond angles and atom locations are defined, and can sometimes be experimentally determined by X-Ray crystallography. A gra…
When a proton and an antiproton annihilate, the annihilation products are usuall
When a proton and an antiproton annihilate, the annihilation products are usually pions. Suppose 8 pions are produced. Of each possible type ? , ? - and ? 0, how many pions are po…
When a pure monosaccharide of the alpha-D-pyranose form is placed in a plane pol
When a pure monosaccharide of the alpha-D-pyranose form is placed in a plane polarimeter it rotates plane- polarized light +149.3 degrees. The pure beta-anomer of this monosacchar…
When a reactant A reacts in a batch reactor at 227 degree C and 10.1 kPa, the re
When a reactant A reacts in a batch reactor at 227 degree C and 10.1 kPa, the reactant reaches an equilibrium conversion of 50% following the stoichiometry A 2B (reversible reacti…
When a reaction achieves a steady state: Select one: a. The rate decreases b. Th
When a reaction achieves a steady state: Select one: a. The rate decreases b. The [ES] remains constant over time c. The rate increases exponentially d. The enzyme is completely s…
When a reaction reaches Equilibrium A. The value of equilibrium constant is 1 B.
When a reaction reaches Equilibrium A. The value of equilibrium constant is 1 B. The reaction is at peace. C. The rate constants of the forward and reverse reactions are equal. D.…
When a reaction reaches Equilibrium____, The value of equilibrium constant is 1
When a reaction reaches Equilibrium____, The value of equilibrium constant is 1 The reaction is at peace. The rate constants of the forward and reverse reactions are equal. The ra…
Subject
Chemistry concepts and calculations
Use Browse or pick another subject.