Chemistry concepts and calculations

1. If all of the electron groups around a central atom are bonding groups (that

1. If all of the electron groups around a central atom are bonding groups (that is, there are no lone pairs), what is the molecular geometry for two electron groups? 2. If all of …

1. If all of the magnesium nitride that formed were not removed, would the final

1. If all of the magnesium nitride that formed were not removed, would the final percentage of Mg in the product calculates be too high or too low? Explain! 2.if some of the magne…

1. If an acid has a Ka value of 1.5x10 -5 , what will be the value of the equili

1. If an acid has a Ka value of 1.5x10-5, what will be the value of the equilibrium constant for the following reaction? HA(aq) + OH-(aq) <-------> A-(aq) + H2O(aq) HINTS: R…

1. If an aqueous solution has a glucose composition of 3.0% mass to volume, then

1. If an aqueous solution has a glucose composition of 3.0% mass to volume, then how many grams of glucose will be in 1.00 x 102 milliliters of this solution? a. 1.0 g b. 1.5g c. …

1. If an atom has sp3 hybridization in a molecule.The maximum number of bonds th

1. If an atom has sp3 hybridization in a molecule.The maximum number of bonds that the atom can form is: The maximum number of p-p bonds that the atom can form is: 2.If an atom ha…

1. If an insoluble impurity, such as sodium sulfate, was present in a sample, wo

1. If an insoluble impurity, such as sodium sulfate, was present in a sample, would the observed melting point of the sample be too low, too high, or would there be no effect? Exp…

1. If an operator function with one parameter is a member of a class, which oper

1. If an operator function with one parameter is a member of a class, which operand is the owning instance? class someclass { int operator+(int); }; int a; someclass b; Is it a+b,…

1. If by mistake, chemist used 100% ethanol rather than THF as a solvent, would

1. If by mistake, chemist used 100% ethanol rather than THF as a solvent, would the synthesis proceed as expected? Why or why not? 2. Why is bromotoluene added dropwise to the rea…

1. If cyclohexane were planar, how many of the three types of strain (torsional,

1. If cyclohexane were planar, how many of the three types of strain (torsional, angle, steric) would it have, and what feature(s) of its structure would cause each type of strain…

1. If gas molecules in the earth\'s atmosphere have the ability to absorb IR rad

1. If gas molecules in the earth's atmosphere have the ability to absorb IR radiation, these gases are known as are known as greenhouse gases. They absorb IR radiation to excite m…

1. If it takes 75 min for the concentration of a reactant to drop to 25% of its

1. If it takes 75 min for the concentration of a reactant to drop to 25% of its initial value in a first order reaction, what is the rate constant for the reaction in units min^-1…

1. If one wanted to reduce the solubility of benzoic acid in water to get it bet

1. If one wanted to reduce the solubility of benzoic acid in water to get it better partitioned into diethyl ether, would it be better to add potassium carbonate or sodium chlorid…

1. If oxygen is collected over water at 15 C and 765 mmHg , what is the partial

1. If oxygen is collected over water at 15 C and 765 mmHg , what is the partial pressure of the oxygen? Refer to the table below for the vapor pressure of water. 2. A sample of hy…

1. If q = -29 kJ for a certain process, the process is: a) occurs rapidly b) is

1. If q = -29 kJ for a certain process, the process is:                                       a) occurs rapidly                                        b) is exothermic            …

1. If the HCl used in this experiment was prepared at a concentration of 0.15M.

1. If the HCl used in this experiment was prepared at a concentration of 0.15M. Using your volume of HCl neutralized by your whole tablet, calculate the mass of active ingredient …

1. If the HCl used in this experiment was prepared at a concentration of 0.15M.

1. If the HCl used in this experiment was prepared at a concentration of 0.15M. Using your volume of HCl neutralized by your whole tablet, calculate the mass of active ingredient …

1. If the amount of mercury in a polluted lake is 0.400ug Hg/ml, what is the tot

1. If the amount of mercury in a polluted lake is 0.400ug Hg/ml, what is the total mass in KILOgrams of mercury in the lake? The lake has a surface area of 105 square miles and ha…

1. If the barometer reading is recorded to be higher than the actual value. What

1. If the barometer reading is recorded to be higher than the actual value. What effect does this error have on the reported value for the molar mass of the compound? Briefly expl…

1. If the concentration of protein to be added in a buffer is 13 mg/ml, does thi

1. If the concentration of protein to be added in a buffer is 13 mg/ml, does this mean 13 mg of protein needs to be dissolved in 1 ml of buffer? 2. If the concentration of protein…

1. If the infrared spectrum of your compound has peaks at 1750 cm (strong, sharp

1. If the infrared spectrum of your compound has peaks at 1750 cm (strong, sharp), and 1220 cm (strong), and no broad peak at 3000-3500 cm', you would suspect that it contains: a.…

1. If the initial concentration of commercial vinear is 0.817 M in acetic acid,

1. If the initial concentration of commercial vinear is 0.817 M in acetic acid, what is the final concentration of acetic acid in the test solution? Show calculations. 2. Wrtie th…

1. If the lone pair were not present on the nitrogen in NBr 3 of the 3-D structu

1. If the lone pair were not present on the nitrogen in NBr3 of the  3-D structures, what would be the shape of the species? 2. What would happen to the polarity if the lone pair …

1. If the mass of calcium in a sample of Ca(HCO3)2 were equal, the number of oxy

1. If the mass of calcium in a sample of Ca(HCO3)2 were equal, the number of oxygen atoms in the Ca(HCO2)2 sample would be ______ the number of oxygen atoms in the Ca(HCO3)2 A. gr…

1. If the overlap integral for two atomic orbitals is found to be ~0.1, what doe

1.         If the overlap integral for two atomic orbitals is found to be ~0.1, what does this imply? Question options: There is substantial overlap between the two atomic orbital…

1. If the pH of a solution is 6.79, calculate the a) hydronium ion concentration

1. If the pH of a solution is 6.79, calculate the a) hydronium ion concentration in the solution. SHOW YOUR WORK!                                                b) hydroxide ion c…

1. If the pH of a solution of NH 3 is 11.67, what is the concentration of NH 3 i

1.       If the pH of a solution of NH3 is 11.67, what is the concentration of NH3 in the solution? (For NH3, Kb = 1.8x10–5) (a)   0.00029 M (b)   0.0038 M (c)   0.0047 M (d)   0.…

1. If the permanganate solution was not thoroughly acidified, what would be the

1. If the permanganate solution was not thoroughly acidified, what would be the effect on the yield of the product? Explain your answer. **this lab involves the preparation of 9,1…

1. If the plasma pH is 7.4 and the plasma concentration of HCO3- is 15 mM, what

1. If the plasma pH is 7.4 and the plasma concentration of HCO3- is 15 mM, what is the plasma concentration of H2CO3? What is the plasma concentration of CO2 (dissolved)? If metab…

1. If the plasma pH is 7.4 and the plasma concentration of HCO3- is 15 mM, what

1. If the plasma pH is 7.4 and the plasma concentration of HCO3- is 15 mM, what is the plasma concentration of H2CO3? What is the plasma concentration of CO2 (dissolved)? If metab…

1. If the pressure in a gas container that is connected to an open-end U-tube ma

1. If the pressure in a gas container that is connected to an open-end U-tube manometer is 106 kPa and the pressure of the atmosphere at the open end of the tube is 742 mm Hg, the…

1. If the reaction gave a mixture of products, could you distinguish between Mec

1. If the reaction gave a mixture of products, could you distinguish between Mechanisms 1 and 4? If so, how? 2. In the yield calculation, it is not necessary to calculate the numb…

1. If the smallest increment on a ruler is 0.01cm, to how many decimal places sh

1. If the smallest increment on a ruler is 0.01cm, to how many decimal places should measurements be recorded? 2. Name two major points to watch out for when selecting a scale for…

1. If the smallest increment on a ruler is 0.01cm, to how many decimal places sh

1. If the smallest increment on a ruler is 0.01cm, to how many decimal places should measurements be recorded? 2. Name two major points to watch out for when selecting a scale for…

1. If the standard solutions had unknowingly been made up tobe 0.0024 M AgNO3 an

1. If the standard solutions had unknowingly been made up tobe 0.0024 M AgNO3 and 0.0040 M K2CrO4, would this have affected your results? Why? 2. If your curvette had been dirty, …

1. If the value of Kc for a given reacti on at a given temperature is a small nu

1. If the value of Kc for a given reacti on at a given temperature is a small number, the energy of the products is likely to bethe energy of the reactants because a. greater than…

1. If the walls in a room are 955 square feet in area, and a gallon of paint cov

1. If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft 1 yd) A) 47 gallons B…

1. If there is a miss in the TLB how many I/O operations are executed? Justify y

1. If there is a miss in the TLB how many I/O operations are executed? Justify your answer. 2. Consider a paging system with the page table stored in memory. If a memory reference…

1. If there were air bubbles around the pennies in the water as the volume was d

1. If there were air bubbles around the pennies in the water as the volume was determined, would the calcu- lated composition of the penny shift to more copper or more zinc/ Expla…

1. If water is added to 0.80 g of NaOH to bring the volume of the solution to 15

1. If water is added to 0.80 g of NaOH to bring the volume of the solution to 150.0 mL, what is the theoretical molarity of the sodium hydroxide solution? If we titrate 10.00 mL o…

1. If we have mostly (+) 2-butanol with a specific rotation of +9.72°. We compar

1. If we have mostly (+) 2-butanol with a specific rotation of +9.72°. We compare this rotation with the +13.5° rotation of the pure (+) enantiomer. Calculate % enantiomer excess …

1. If you can easily see the different parts that make up a mixture, it is a -mi

1. If you can easily see the different parts that make up a mixture, it is a -mixture. b. heterogencous c. solution d. need more information a. homogeneous 2. What do we call a su…

1. If you had a mixture that contained, NaCl, what is the mathematical expressio

1. If you had a mixture that contained, NaCl, what is the mathematical expression that would show percent NaCl in the mixture? (2 points) 2. In this lab you will determine the per…

1. If you had used 0.030 g of magnesium in a first trial and 0.040 g in a second

1. If you had used 0.030 g of magnesium in a first trial and 0.040 g in a second, would you expect the molar volume at STP to be larger or smaller in the second trial? Explain you…

1. If you have 10.0 mL of 3.0 M HCl and you want 0.50 M HCI. How much water in m

1. If you have 10.0 mL of 3.0 M HCl and you want 0.50 M HCI. How much water in mL do you need to make the 0.50 M HCl solution? a, 50 mL b, 60 mL c. 70 mL d.. 80 mL Calculate the a…

1. If you have two identically-sized solid blocks completely immersed in water a

1. If you have two identically-sized solid blocks completely immersed in water and one is ironwood (density = 1.17 g/cm3) and one is lead (density = 11.34g/cm3), what is the diffe…

1. If you heat too fast, will your observed melting point be higher or lower tha

1. If you heat too fast, will your observed melting point be higher or lower than the true value? Explain 2. Write a balanced equation for the neutralization of acetylsalicylic ac…

1. If you heat too fast, will your observed melting point be higher or lower tha

1. If you heat too fast, will your observed melting point be higher or lower than the true value? Explain 2. Write a balanced equation for the neutralization of acetylsalicylic ac…

1. If you mix an ethylene oxide polyol that has been generated from pentaerythri

1.     If you mix an ethylene oxide polyol that has been generated from pentaerythritol with hexamethylene di-isocyanate, where the ratio of hydroxyl groups to isocyanate groups i…

1. If you mixed 100 mL of water at 20C with 100mL of water at 40C in a perfect (

1. If you mixed 100 mL of water at 20C with 100mL of water at 40C in a perfect (adiabatic) container, you would expect to end up with 200mL of water at 30C. ?Tcold water = 10C mco…

1. If you need to determine impacts on revenue resulting from an increase or dec

1. If you need to determine impacts on revenue resulting from an increase or decrease in price and/ or sales, the best option to use is a A. database B. Spreadsheet 2. All other i…