Chemistry concepts and calculations

1. The chemical equation for the synthesis, balanced only for the reactants, is

          1.  The chemical equation for the synthesis, balanced only for the reactants,  is as follows.  Supply the coefficients for KCl and H2O required to balance  the equation …

1. The coefficients of friction between a block of mass 1.0 kg and a surface are

1. The coefficients of friction between a block of mass 1.0 kg and a surface are ?s = 0.75 and ?k = 0.45. Assume the only other force acting on the block is that due to gravity. W…

1. The colligative properties of a solution are a function of the A. nature of t

1. The colligative properties of a solution are a function of the A. nature of the solvent B. number of solvent particles C. number of solute particles D. nature of the solute 2. …

1. The combination of infrared (IR) and Raman spectroscopies constitutes the fie

1. The combination of infrared (IR) and Raman spectroscopies constitutes the field of vibrational spectroscopy, which is a powerful tool in analyzing molecular structure. Let us c…

1. The combustion of gasoline (C 8 H 18 ) with excess oxygen produces carbon dio

1. The combustion of gasoline (C8H18) with excess oxygen produces carbon dioxide and water. -Write a balanced chemical reaction for the combustion of gasoline to yield carbon diox…

1. The combustion of propane produces carbon dioxide and steam. C3H8(g) + 5 O2(g

1. The combustion of propane produces carbon dioxide and steam. C3H8(g) + 5 O2(g) ? 3 CO2(g) + 4 H2O(g) All of the following statements concerning this reaction are correct EXCEPT…

1. The combustion of propane produces carbon dioxide and steam. C3H8(g) + 5 O2(g

1. The combustion of propane produces carbon dioxide and steam. C3H8(g) + 5 O2(g) ? 3 CO2(g) + 4 H2O(g) All of the following statements concerning this reaction are correct EXCEPT…

1. The committed step of a metabolic pathway is often inhibited by the final pro

1. The committed step of a metabolic pathway is often inhibited by the final product of the pathway. This type of inhibition is an example of inhibition. 2. Metal ions often play …

1. The common laboratory solvent benzene is often used to purify substances diss

1. The common laboratory solvent benzene is often used to purify substances dissolved in it. The vapor pressure of benzene , C6H6, is 73.03 mm Hg at 25 °C. In a laboratory experim…

1. The compound malonate is an analog of succinate and is a strong inhibitor of

1. The compound malonate is an analog of succinate and is a strong inhibitor of succinate dehydrogenase. The active site of the enzyme will bind to either molecule, however malona…

1. The compound silver fluoride is a strong electrolyte. Write the reaction when

1. The compound silver fluoride is a strong electrolyte. Write the reaction when solid silver fluoride is put into water: 2. The compound potassium carbonate is a strong electroly…

1. The concentration of FeNCS 2+ in each of the Standard Solutions at equilibriu

1. The concentration of FeNCS 2+ in each of the Standard Solutions at equilibrium is taken to be the same as the initial concentration of KSCN in the solution. Explain the rationa…

1. The concentration of an enzyme within a cell is extremely low realtive to oth

1. The concentration of an enzyme within a cell is extremely low realtive to other material present, yet functions effectively in its metabolic rate. How can enzyme function and n…

1. The concept of \"induced fit\" refers to the fact that: Select one: a. The su

1. The concept of "induced fit" refers to the fact that: Select one: a. The substrate's structure is complementary to the structure of the enzyme's active site. b. Initial substra…

1. The conjugate acid of H2PO4– is ______. (the numbers in the formulas are subs

1. The conjugate acid of H2PO4– is ______. (the numbers in the formulas are subscripts in the question and answer choices) A. PO4 -3 (the -3 is a superscript) B.H2PO4 C. H3PO4 D.H…

1. The contamination of a pure organic with an impurity affects the observed mel

1. The contamination of a pure organic with an impurity affects the observed melting point only if the impurity dissolves to some extent in the liquid phase of the organic compoun…

1. The contamination of a pure organic with an impurity affects the observed mel

1. The contamination of a pure organic with an impurity affects the observed melting point only if the impurity dissolves to some extent in the liquid phase of the organic compoun…

1. The coordination number of a metal atom in a close-packed structure is? 2. Th

1. The coordination number of a metal atom in a close-packed structure is? 2. The coordination number of a metal atom in a BCC structure is? 3. The coordination number of an atom …

1. The correct IUPAC name for the compound SnO2 is which of the following? a. ti

1. The correct IUPAC name for the compound SnO2 is which of the following? a. tin oxide b. stannous oxide c. stannous oxygen d. tin (IV) oxide e. tin (II) oxide 2. The correct for…

1. The correct answer for the product (6.45 × 105) × (1.2 × 104) is: (considerin

1. The correct answer for the product (6.45 × 105) × (1.2 × 104) is: (considering significant figures) A. 7.7 × 109 B. 5.375 × 101 C. 7.74 × 109 D. 7.7 × 1011 E. 7.74 × 1011 2. Th…

1. The covalent intermediate formed by a serine protease reacting with its subst

1. The covalent intermediate formed by a serine protease reacting with its substrate is called the a. Michaelis complex b. acyl-enzyme c. transition state d. apoenzyme 2. The slow…

1. The current exchange rate between the Euro and the US dollar is 1 Euro = $1.0

1. The current exchange rate between the Euro and the US dollar is 1 Euro = $1.095. Gasoline is Europe is sold by the liter. The current price of gas in the US is $1.649 per gallo…

1. The current in a 100 watt lightbulb is 0.760 A . The filament inside the bulb

1. The current in a 100 watt lightbulb is 0.760 A . The filament inside the bulb is 0.170 mm in diameter. a. What is the current density in the filament? Express your answer to th…

1. The cuvettes we used in this experiment have a pathlength of 1.0 cm, and that

1. The cuvettes we used in this experiment have a pathlength of 1.0 cm, and that is the most common size for solution work. However, 0.1 cm pathlength cuvettes are available. Woul…

1. The cuvettes we used in this experiment have a pathlength of 1.0 cm, and that

1. The cuvettes we used in this experiment have a pathlength of 1.0 cm, and that is the most common size for solution work. However, 0.1 cm pathlength cuvettes are available. Woul…

1. The data attached is for the titration of vinegar (density 1.05 g/mL) which c

1. The data attached is for the titration of vinegar (density 1.05 g/mL) which contains acetic acid. HC2H3O2. Here an aliquot of 5.00 mL vinegar is titrated using 0.1029 M NaOH. C…

1. The data in Table I below were obtained by using a GLC column operated at con

1. The data in Table I below were obtained by using a GLC column operated at constant T Retention Rime (min) 0.32 4.49 6.23 7.08 7.78 11.52 16.24 18.11 Adjusted Retention Time cal…

1. The data in Table I below were obtained by using a GLC column operated at con

1. The data in Table I below were obtained by using a GLC column operated at constant T Retention Rime (min) 0.32 4.49 6.23 7.08 7.78 11.52 16.24 18.11 Adjusted Retention Time cal…

1. The data listed below was determined from the dehydration of a hydrate of cal

1. The data listed below was determined from the dehydration of a hydrate of calcium sulfate Mass of empty crucible = 17.274 g Mass of crucible and calcium sulfate hydrate = 19.08…

1. The debugger is a tool that will debug your logic errors automatically A) Tru

1. The debugger is a tool that will debug your logic errors automatically A) True B) False 2. Which of the following is something you can do that will make debugging easier? A) Br…

1. The decomposition of sulfuryl chloride (SO2Cl2) is a first-order process. The

1. The decomposition of sulfuryl chloride (SO2Cl2) is a first-order process. The rate constant for the decomposition at 660 K is 4.5 10-2 s-1. (a) If we begin with an initial SO2C…

1. The decompostion, by heating, of solid mercury (II) nitrateto produce pure li

1. The decompostion, by heating, of solid mercury (II) nitrateto produce pure liquid mercury, nitrogen dioixide gas, and oxygengas. Is this correct for number 1? Hg (NO3)2 -> H…

1. The decrease in entropy (the AS value is negative) observed for alkene additi

1. The decrease in entropy (the AS value is negative) observed for alkene addition reactions results from: A) B) C) D) E) the breaking of a and bond. the formation of two bonds. t…

1. The degree of ionization is defined as the fraction of molecules of a weak el

1. The degree of ionization is defined as the fraction of molecules of a weak electrolyte that reacts with water to give ions. Calculate the degree of ionization (amount of [H+] g…

1. The density of a substance is a) a value and does not ever change even at dif

1. The density of a substance is a) a value and does not ever change even at different temperatures. b) the same for all mixtures made of the same pure substances. c) changes base…

1. The density of liquid iron (6.98 g/cm3)is lower than that of solid iron (7.87

1. The density of liquid iron (6.98 g/cm3)is lower than that of solid iron (7.874 g/cm3). This trend holds for all substances. Select one or more: a. true b. false 2. The density …

1. The density of liquid iron (6.98 g/cm3)is lower than that of solid iron (7.87

1. The density of liquid iron (6.98 g/cm3)is lower than that of solid iron (7.874 g/cm3). This trend holds for all substances. Select one or more: a. true b. false 2. The density …

1. The density of liquid oxygen at its boiling point is 1.14 kg/L , and its heat

1. The density of liquid oxygen at its boiling point is 1.14 kg/L , and its heat of vaporization is 213 kJ/kg . How much energy in joules would be absorbed by 3.0L of liquid oxyge…

1. The density of liquid oxygen at its boiling point is 1.14 kg/L , and its heat

1. The density of liquid oxygen at its boiling point is 1.14 kg/L , and its heat of vaporization is 213 kJ/kg . How much energy in joules would be absorbed by 3.0L of liquid oxyge…

1. The dimerization of nitrogen dioxide occurs with the following equilibrium: 2

1. The dimerization of nitrogen dioxide occurs with the following equilibrium: 2 NO2(g) <----> N2O4(g). At room temperature, the Kc for this reaction is 170. If a 2 L contai…

1. The distance between two cities is 1500 km . How long will it take, in hours,

1. The distance between two cities is 1500 km . How long will it take, in hours, to drive from one city to the other if your average speed is 65 mi/h ? 2. How many milliliters of …

1. The distributed mode of BranchCache places files on dedicated servers in the

1. The distributed mode of BranchCache places files on dedicated servers in the branch office A) True B) False 2. Which does not apply to hosted mode of BranchCache? A) Can be add…

1. The distributed mode of BranchCache places files on dedicated servers in the

1. The distributed mode of BranchCache places files on dedicated servers in the branch office 2. Which does not apply to hosted mode of BranchCache? 3. Which of the following is n…

1. The distribution coefficient, K = Cether/Cwater is 10 forcompound Y. What wei

1. The distribution coefficient, K = Cether/Cwater is 10 forcompound Y. What weight of compound Y would be removed from asolution of 4.0 g of Y in 100 mL of water by a single extr…

1. The diumal (daily) movement of the earth round the sun is 8. Geography is the

1. The diumal (daily) movement of the earth round the sun is 8. Geography is the study of a. called a. Rotation b. Revolution C. Equator d. Prime Meridian b. C. d. Man nature inte…

1. The electrolysis of water is often done with a small amount of sulfuric acid

1. The electrolysis of water is often done with a small amount of sulfuric acid added to the water. What is the role of the sulfuric acid? 2. A) Write the half-reactions and overa…

1. The electron configuration for calcium, atomic number -20 is e. None of the a

1. The electron configuration for calcium, atomic number -20 is e. None of the above lowest-energy arrangement of electrons in a subshell is obtained by putting s into separate or…

1. The electron spin quantum number indicates the A. speed of the electron B. si

1. The electron spin quantum number indicates the A. speed of the electron B. size of the electron C. spin of the electron ........................................................…

1. The element bromine was first prepared by oxidation of aqueous potassium brom

1. The element bromine was first prepared by oxidation of aqueous potassium bromide with solid manganese(IV) oxide. Write a balanced net ionic equation for the reaction in aqueous…

1. The element silicon has 3 isotopes with the masses and natural abundances sho

1. The element silicon has 3 isotopes with the masses and natural abundances shown in the table. Mass of Isotope Natural abundance 27.97693 92.23 28.97649 4.67 29.97376 3.10 What …