Chemistry concepts and calculations

1.A base substitution in mRNA replaces cytosine in the codon GUC with adenine. H

1.A base substitution in mRNA replaces cytosine in the codon GUC with adenine. How would this substitution affect the amino acids in the protein? 2.What are the names and abbrevia…

1.A beam of protons is moving in the + x direction with a speed of 29.3 km/s thr

1.A beam of protons is moving in the +x direction with a speed of 29.3 km/s through a region in which the electric field is perpendicular to the magnetic field. The beam is not de…

1.A bimolecular nucleophilic substitution reaction is abbreviated to ________. S

1.A bimolecular nucleophilic substitution reaction is abbreviated to ________. Select one: A. NS1   B. BNS   C. NS2   D. SN1   E. SN2 2.In molecular orbital theory, the 1s orbital…

1.A block of metal has dimensions 5.00 cm x 2.50 cm x 3.00 cm. Calculate the vol

1.A block of metal has dimensions 5.00 cm x 2.50 cm x 3.00 cm. Calculate the volume of the block, showing the answer to the correct number of significant figures and unit. 2.If th…

1.A buffer contains HCHO2 (aq) and KCHO2 (aq). Which statement correctly summari

1.A buffer contains HCHO2 (aq) and KCHO2 (aq). Which statement correctly summarizes the action of this buffer? a)HCHO2 (aq) neutralizes added acid, and KCHO2 (aq) neutralizes adde…

1.A buffer solution contains 0.434 M nitrous acid and 0.239 M potassium nitrite

1.A buffer solution contains 0.434 M nitrous acid and 0.239 M potassium nitrite . If 0.0333 moles of sodium hydroxide are added to 150 mL of this buffer, what is the pH of the res…

1.A car is traveling on Interstate 90 at 65 miles per hour. If it is approximate

1.A car is traveling on Interstate 90 at 65 miles per hour. If it is approximately 6.76 x 102 km from Cleveland, Ohio to Chicago, Illinois, how many hours will the trip take assum…

1.A complex ion is formed by a Co 3+ ion which is linked up to one carbonate ion

1.A complex ion is formed by a Co3+ ion which is linked up to one carbonate ion and four ammonia molecules. The formula of the compound is properly written as Select one: a. Na[Co…

1.A compound can be an acid or base but not both. true or false 2.Although a Bro

1.A compound can be an acid or base but not both. true or false 2.Although a Bronsted-Lowry acids must contain hydrogen atom, it may be a neutral molecule or contain a net positiv…

1.A corrosion technologist pipetted a 100.00 ml hard water sample and titrated i

1.A corrosion technologist pipetted a 100.00 ml hard water sample and titrated it with 37.64 ml of 0.01 M EDTA solution for a total hardness endpoint, and 29.32 ml of 0.01 M EDTA …

1.A cylinder with a moveable piston contains 0.504 molof gas and has a volume of

1.A cylinder with a moveable piston contains 0.504 molof gas and has a volume of 278 mL .What will its volume be if an additional 0.178 mol of gas is added to the cylinder? (Assum…

1.A drug is administered to the body as a bolus injection at a dose of 100 mg. I

1.A drug is administered to the body as a bolus injection at a dose of 100 mg. If the volume of distribution is 140 L, and the half life of the drug in the body is 3h due to urine…

1.A helium-filled weather balloon has a volume of 811 L at 23 °C and 750 mm Hg.

1.A helium-filled weather balloon has a volume of 811 L at 23 °C and 750 mm Hg. It is released and rises to an altitude of 8.69 km, where the pressure is 281 mm Hg and the tempera…

1.A hydrated form of copper sulfate (CuSO4·x H2O) is heated to drive off all the

1.A hydrated form of copper sulfate (CuSO4·x H2O) is heated to drive off all the water. If we start with 9.19 g of hydrated salt and have 5.87 g of anhydrous CuSO4 after heating, …

1.A hydrocarbon 0.106g when burnt in air gave 0.364g of CO2 and .596g of water.

1.A hydrocarbon 0.106g when burnt in air gave 0.364g of CO2 and .596g of water. The molar mass of the compound is 256.4g/mol. What is the empirical and molecular formula of the co…

1.A hydrogen atom has an excited electron in the n = 6 energy level. This electr

1.A hydrogen atom has an excited electron in the n = 6 energy level. This electron then emits a photon as it moves down to a lower energy level. Given that the energy emitted from…

1.A liquid fuel mixture contains 29.50 % hexane (C6H14), 17.70 % heptane (C7H16)

1.A liquid fuel mixture contains 29.50 % hexane (C6H14), 17.70 % heptane (C7H16), and the rest octane (C8H18). What maximum mass of carbon dioxide is produced by the complete comb…

1.A liquid fuel mixture contains 29.50 % hexane (C6H14), 17.70 % heptane (C7H16)

1.A liquid fuel mixture contains 29.50 % hexane (C6H14), 17.70 % heptane (C7H16), and the rest octane (C8H18). What maximum mass of carbon dioxide is produced by the complete comb…

1.A measurement taken, along the axis of the light source, of the amount of ligh

1.A measurement taken, along the axis of the light source, of the amount of light scattered or reflected by small particles in a sample cuvette is the principle of a. Fluorometry …

1.A metal initially at 450. ° C and mass 2.00 g is dropped into a liquid with sp

1.A metal initially at 450. ° C and mass 2.00 g is dropped into a liquid with specific heat capacity 4.00 Jg-1 ° C-1, mass 10.0 g and initial temperature 40.0 ° C. The final tempe…

1.A mixture of 0.10 mol of NO, 0.050 mol of H2, and 0.10 mol of H2O is placed in

1.A mixture of 0.10 mol of NO, 0.050 mol of H2, and 0.10 mol of H2O is placed in a 1.0-L vessel at 300 K. The following equilibrium is established: 2NO(g)+2H2(g)N2(g)+2H2O(g) At e…

1.A normal breath of air is about 1.00 L. If the air is drawn in at -13.0 C and

1.A normal breath of air is about 1.00 L. If the air is drawn in at -13.0 C and is warmed to 31.0 C, what will be the new volume of the air? Assume that the pressure and amount of…

1.A phase diagram of a pure compound has a triple point at 27°C and 65 mm Hg, a

1.A phase diagram of a pure compound has a triple point at 27°C and 65 mm Hg, a normal melting point at 24 °C, and anormal boiling point at 118 °C. Sketch the phase diagram forthi…

1.A primary key is a column that holds a unique value for each row, and can be u

1.A primary key is a column that holds a unique value for each row, and can be used to identify specific rows? (true/false) 2.A foreign key is a column in one table that reference…

1.A researcher studying the nutritional value of a new candy places a 5.10-gram

1.A researcher studying the nutritional value of a new candy places a 5.10-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temper…

1.A sample containing the following four alcohols was analyzed by gas chromatogr

1.A sample containing the following four alcohols was analyzed by gas chromatography. Alcohol           weight (g)        weight %         peak area (cm2)           n-butyl 0.1731…

1.A sample contains a mixture of two dyes, A and B. The molar absorptivity coeff

1.A sample contains a mixture of two dyes, A and B. The molar absorptivity coefficients for dye A are 31,000 M-1 cm -1 at 500nm and 1,000 M-1 cm -1 at 590nm and for dye B are 8,50…

1.A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a

1.A sample of potassium hydrogen phthalate (KHC8H4O4), which is an acid, with a mass of 0.4749 g is dissolved in water and used to standardize a solution of strontium hydroxide. A…

1.A segment of DNA has a strand containing the sequence of 5\' GCTATGT 3\'. What

1.A segment of DNA has a strand containing the sequence of 5' GCTATGT 3'. What is the sequence of the complementary strand? Be sure to indicate polarity of the strand sequence. If…

1.A solution has [H3O+] = 7.6 x 10 -5 M. Use the ion product constant of water (

1.A solution has [H3O+] = 7.6 x 10 -5 M. Use the ion product constant of water (Kw=[H3O+][OH-]) to find te [OH-] of the solution. 2. A solution has [OH-]=2.1x10-2 M. Use the ion p…

1.A solution is prepared by dissolving 0.25 g of sodium oxide in water to give 1

1.A solution is prepared by dissolving 0.25 g of sodium oxide in water to give 132.0 mL of solution. Express the pH to two decimal places. 2.A solution is prepared by dissolving 1…

1.A spray can is used untilit s empty except for the propellant gas, which has a

1.A spray can is used untilit s empty except for the propellant gas, which has a pressure of 1344 torr at 23°C. If the can is thrown into a fire(T=475 °C), what will be the pressu…

1.A stockpile of approximately 50 metric tons of plutonium exists in the United

1.A stockpile of approximately 50 metric tons of plutonium exists in the United States as a result of disassembling warheads from the nuclear arms race. What is the likely fate of…

1.A student attempts to identify an unknown compound by using chemical reactions

1.A student attempts to identify an unknown compound by using chemical reactions to calculate mass relationships. After heating a sample weighing 0.4521 g, the mass decreased to 0…

1.A student performs a titration by despensing 24.6 ml of 0.10 M NaOH into a 35.

1.A student performs a titration by despensing 24.6 ml of 0.10 M NaOH into a 35.5 mL sample of HCL. Calculate the molarity, mol/L, of the HCL solution. 2.Write the balanced equati…

1.A student was given a sample of water that contained 5.65x10-4 moles of phosph

1.A student was given a sample of water that contained 5.65x10-4 moles of phosphate (HPO42-). They added an excess magnesium (Mg2+) and ammonium (NH4+) to the water sample to form…

1.A student was given a sample of water that contained 5.65x10-4 moles of phosph

1.A student was given a sample of water that contained 5.65x10-4 moles of phosphate (HPO42-). They added an excess magnesium (Mg2+) and ammonium (NH4+) to the water sample to form…

1.A system releases 691 kJ of heat and does 100 kJ of work on the surroundings.

1.A system releases 691 kJ of heat and does 100 kJ of work on the surroundings. What is the change in internal energy of the system? Express your answer to 2 sig figs. 2.If 1.7 g …

1.A tablespoon (tbsp) is how many teaspoons (tsp)? 1/2/3/4 2.A metal pan made of

1.A tablespoon (tbsp) is how many teaspoons (tsp)? 1/2/3/4 2.A metal pan made of cast iron will take longer to heat than an aluminum pan because iron has a (lower.higher) thermal …

1.A tablespoon (tbsp) is how many teaspoons (tsp)? 1/2/3/4 2.A metal pan made of

1.A tablespoon (tbsp) is how many teaspoons (tsp)? 1/2/3/4 2.A metal pan made of cast iron will take longer to heat than an aluminum pan because iron has a (lower.higher) thermal …

1.A) A student used the method MM=g*R*T/P*V for determine the molar masss of an

1.A) A student used the method MM=g*R*T/P*V for determine the molar masss of an unknown volatile liquid. The barometric pressure in the lab was 746 mmHg, and the temperature of th…

1.ATP in nitrogen fixation: a. Is provided by the host plant b. Directly drives

1.ATP in nitrogen fixation: a. Is provided by the host plant b. Directly drives the oxidation of Ferredoxin and reduction of Dinitrogenase reductase c. Is required because flow of…

1.According to Nate Lewis, which one on the following list is the single most im

1.According to Nate Lewis, which one on the following list is the single most important challenge facing humanity in the 21st century? A. Terrorist attack. B. Global warming. C. H…

1.According to the following thermochemical equation, if 31.1 g of NO2 is produc

1.According to the following thermochemical equation, if  31.1 g  of  NO2  is produced, how much heat is released at constant pressure?how much heat is released at constant pressu…

1.All of the following molecules have all bonds being equivalent except: CH4 2.

1.All of the following molecules have all bonds being equivalent except: CH4 2. Which of the following has the largest repulsion, assuming that all the angles between electron pai…

1.Ammonia, NH3(g), reacts with oxygen, O2 (g), to form nitrogen dioxide, NO2(g),

1.Ammonia, NH3(g), reacts with oxygen, O2 (g), to form nitrogen dioxide, NO2(g), and water, H2O(g), according to the following equation. 4NH3(g) + 7O2(g) 4NO2(g) + 6H2O(g) You rea…

1.An Mg-24 atom weighs 23.985 amu. How many grams does it weigh? How many microg

1.An Mg-24 atom weighs 23.985 amu. How many grams does it weigh? How many micrograms? One amu is the same as 1.661 × 10-24 g. (Enter your answer to four significant figures.) What…

1.An accepted value for the intensity of full sunlight (insolation) is approxima

1.An accepted value for the intensity of full sunlight (insolation) is approximately... a)10 W/m2 b)100 W/m2 c) 1000 W/m2 d) 10,000 W/m2 2.What type of solar radiation can be used…

1.An aqueous solution contains 0.305 M ammonia. Calculate the pH of the solution

1.An aqueous solution contains 0.305 M ammonia. Calculate the pH of the solution after the addition of 1.58×10-2 moles of perchloric acid to 125 mL of this solution. (Assume that …

1.An exothermic reaction at standard conditions (298 K and 1 atm) has q c = 5.00

1.An exothermic reaction at standard conditions (298 K and 1 atm) has qc = 5.00 kJ/mole (heat released) and DV = + 4.95 × 10-2 m3/mole (volume increases). Use w = PDV to determine…