Chemistry concepts and calculations

1)Even before the proposal of continental drift, paleontologists recognized that

1)Even before the proposal of continental drift, paleontologists recognized that some sort of land connection was needed to account for the identical fossil organisms found on mul…

1)Explain what the ideal properties of a pH indicator are. 2)During the latter p

1)Explain what the ideal properties of a pH indicator are. 2)During the latter part of the lab, you titrated acetic acid with sodium hydroxide. Prior to the titration, you added t…

1)Explain what the ideal properties of a pH indicator are. 2)During the latter p

1)Explain what the ideal properties of a pH indicator are. 2)During the latter part of the lab, you titrated acetic acid with sodium hydroxide. Prior to the titration, you added t…

1)Fertilizers serve as sources of the primary plant nutrients nitrogen, phosphor

1)Fertilizers serve as sources of the primary plant nutrients nitrogen, phosphorus, and potassium. A fertilizer labeled 15-30-15 contains 15% nitrogen, 30% phosphorus, and 15% pot…

1)Find the ionic and net ionic equation a. 1 Mg+2H 2 O-->1Mg(OH) 2 +H 2 b.1H 3 P

1)Find the ionic and net ionic equation a. 1 Mg+2H2O-->1Mg(OH)2+H2 b.1H3PO4+3LiOH-->3H2O+1Li3PO4 1)Find the ionic and net ionic equation a. 1 Mg+2H2O-->1Mg(OH)2+H2 b.1H3P…

1)For a given reaction, the rate constant doubles when the temperature is increa

1)For a given reaction, the rate constant doubles when the temperature is increased from 43.5 °C to 71.5 °C. What is the activation energy for this reaction? (R = 8.314 J/K×mol) _…

1)For a mixture of ethane 60%, acetylene 20%, and benzene 20% total mass of 250

1)For a mixture of ethane 60%, acetylene 20%, and benzene 20% total mass of 250 kg is loaded into a reactor obeying the Carnot cycle, we want to know which produces more work when…

1)For each of the following groups, place the atoms and/or ions inorder of decre

1)For each of the following groups, place the atoms and/or ions inorder of decreasing size. (a) V, V5+, V3+,V+ (b) F -, N3-,Mg2+, Na+ (c) Cl -, Sc3+, Ca2+,P3- (d) I -, Te2-, La3+,…

1)For the following reaction sequence (it is not necessary to understand the che

1)For the following reaction sequence (it is not necessary to understand the chemistry) what significant change(s) would be expected by IR (ignoring C-H absorptions)? None of thes…

1)For the following reaction, 17.4 grams of carbon dioxide are allowed to react

1)For the following reaction, 17.4 grams of carbon dioxide are allowed to react with 49.2 grams of potassium hydroxide . carbon dioxide(g) + potassium hydroxide(aq) potassium carb…

1)For the reaction: AgCl(s) Ag+(aq) + Cl- (aq) In which direction will the equil

1)For the reaction: AgCl(s) Ag+(aq) + Cl- (aq) In which direction will the equilibrium shift when the volume of the reaction vessel is decreased? A. Shift to the right B. Shift to…

1)Given the following reaction: H2(g)+I2(s) ? 2HI(g) with a ? H of 52.9 kJ. What

1)Given the following reaction: H2(g)+I2(s) ? 2HI(g) with a ? H of 52.9 kJ. What is the change in enthalpy for the following reaction: HI(g) ? H2(g)+ I2(s)? Express your answer in…

1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.3

1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of …

1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.3

1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of …

1)How does increasing temperature affect the solubility of a solid? a) the tempe

1)How does increasing temperature affect the solubility of a solid? a) the temperature does not affect the solubility of a solid; solubility depends only on how much solute dissol…

1)How is the analytical concentration of acetic acid in 25ml pipet of raw vinege

1)How is the analytical concentration of acetic acid in 25ml pipet of raw vineger related to tis concentration after its dilution to 250ml? how is this latter concentration of ace…

1)How many Se atoms are there in a 93.2 gram sample of Se ? 2)How many grams of

1)How many Se atoms are there in a 93.2 gram sample of Se ? 2)How many grams of Cr are there in a sample of Cr that contains 3.93×1023atoms? 3)A sample of Na weighs 36.0 grams. Wi…

1)How many kilograms of magnesium can be obtained from 5.96 km^3 of seawater if

1)How many kilograms of magnesium can be obtained from 5.96 km^3 of seawater if the initial Mg^2+ concentration is .19% by mass. Remember the density of seawater is 1.04 g/ml 2) h…

1)How many kilowatt-hours of electricity are used to produce 4.50 kg of magnesiu

1)How many kilowatt-hours of electricity are used to produce 4.50 kg of magnesium in the electrolysis of molten MgCl2 with an applied emf of 5.00 V? a)0.0201 b)0.0496 c)12.4 d)49.…

1)How many moles of HCl are in 67 mL of 0.11 M HCl? 2)What mass of calcium carbo

1)How many moles of HCl are in 67 mL of 0.11 M HCl? 2)What mass of calcium carbonate is needed for complete reaction with the HCI in the previous question HCl in (a)?Calcium carbo…

1)How many valence electrons do the following elements have? Please type your an

1)How many valence electrons do the following elements have? Please type your answer as a number, do not spell the number out. arsenic fluorine gallium   lead radium radon rubidiu…

1)If 0.238 moles of zinc reacts with excess lead(IV) sulfate, how many grams of

1)If 0.238 moles of zinc reacts with excess lead(IV) sulfate, how many grams of zinc sulfate would be produced in the following reaction? Pb(SO4) + 2Zn -> 2ZnSO4 + Pb 2)If a so…

1)If 4.09 moles of C5H12 reacts with excess O2, how many moles of CO2 will be pr

1)If 4.09 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? 2)The first step in the reaction of Alka-Seltzer with …

1)If a bar of a silver 40 cm long, 25 cm wide and 15 cm deep weighs 157.5 kg, wh

1)If a bar of a silver 40 cm long, 25 cm wide and 15 cm deep weighs 157.5 kg, what is the density of the silver in g/cm3? 2)A compound contains 28 g of nitrogen and 16 g of oxygen…

1)If a bar of a silver 40 cm long, 25 cm wide and 15 cm deep weighs 157.5 kg, wh

1)If a bar of a silver 40 cm long, 25 cm wide and 15 cm deep weighs 157.5 kg, what is the density of the silver in g/cm3? 2)A compound contains 28 g of nitrogen and 16 g of oxygen…

1)If a student used a balance that always reads 0.1 g more than the real mass, h

1)If a student used a balance that always reads 0.1 g more than the real mass, how will his/her experimental result be affected in Chemical Measurement lab? The water density will…

1)If the reactant is MnO4- and the product is MnO42-, calculate the change in th

1)If the reactant is MnO4- and the product is MnO42-, calculate the change in the oxidation state of manganese (oxidation state of manganese in product minus the oxidation state o…

1)If the test team is different than the development team, at what step would yo

1)If the test team is different than the development team, at what step would you involve the test team (test engineer and test manager) in your project activities? How would you …

1)If we compare energy of electron in lower shell (denoted as E lower ) with ene

1)If we compare energy of electron in lower shell (denoted as Elower) with energy of electron in higher shell (denoted as Ehigher) then we can say that B.Elower<Ehigher C.Elowe…

1)If you were to apply a substance to prevent rust on a steel hammer, which of t

1)If you were to apply a substance to prevent rust on a steel hammer, which of the following would you expect to protect the iron using the same mechanism as the polymer coating? …

1)In a GC-separation of a mixture of three compounds consisting of 1 mol A, 1 mo

1)In a GC-separation of a mixture of three compounds consisting of 1 mol A, 1 mol B, and 1 mol C, the peak area (integral) produced by the response of the detector is: Compound A:…

1)In addition to tetrahedral, another common shape for AB 4 molecules is square

1)In addition to tetrahedral, another common shape for AB4 molecules is square planar. All five atoms lie in the same plane, with the B atoms at the corners of a square and the A …

1)In contrast to alkenes, the oxidative cleavage of alkynes with either KMnO4 or

1)In contrast to alkenes, the oxidative cleavage of alkynes with either KMnO4 or O3, yield the same products. Write the equatioen for the oxidation of 1-pentyne and 2-pentyne show…

1)In which of the following aqueous solutions would you expect AgBr to have the

1)In which of the following aqueous solutions would you expect AgBr to have the highest solubility? 0.10 M LiBr 0.10 M AgNO3 0.20 M NaBr 0.15 M KBr pure water 2) Choose the Bronst…

1)Including the initial parent process, how many processes are created by the pr

1)Including the initial parent process, how many processes are created by the program shown in Figure 3.31? #include <stdio.h> #include <unistd.h> int main() { /* fork…

1)Is it True or False: Samples must be cooled to room temperature before weighin

1)Is it True or False: Samples must be cooled to room temperature before weighing. Explain your choice. 2)Describe why some ionic compounds dissolve in water while others do not. …

1)Is this reaction endothermic, exothermic, orneither? 2 C(s) + O2 (g) ------> 2

1)Is this reaction endothermic, exothermic, orneither?     2 C(s) + O2 (g) ------> 2CO (g) + 52.8 kcal 2) Is this reaction endothermic, exothermic, or neither? 2NH3 (g) + 22kca…

1)It is desired to produce 27.8 grams of iron(II) oxide by the following reactio

1)It is desired to produce27.8grams ofiron(II) oxideby the following reaction. If the percent yield ofiron(II) oxideis91.4%, how many grams ofoxygen gaswould need to be reacted? 2…

1)It is desired to produce 27.8 grams of iron(II) oxide by the following reactio

1)It is desired to produce27.8grams ofiron(II) oxideby the following reaction. If the percent yield ofiron(II) oxideis91.4%, how many grams ofoxygen gaswould need to be reacted? 2…

1)Make three matches with the following metals and a substance that may act as a

1)Make three matches with the following metals and a substance that may act as a suitable sacrificial electrode. Metals are nickel, iron and silver Gold-sacrificial electrode Copp…

1)Mercury (II) hydroxide is quite insoluble in water (K sp of Hg(OH) 2 = 3.0×10

1)Mercury (II) hydroxide is quite insoluble in water (Ksp of Hg(OH)2 = 3.0×10-26 at 25°C.In which one of the following solutions would you expect Hg(OH)2 to be even less soluble t…

1)MnSO4(aq) is converted to MnO2(s) in a basic medium as oxygen gas is converted

1)MnSO4(aq) is converted to MnO2(s) in a basic medium as oxygen gas is converted to hydroxide ion. In this case is the sulfate ion a spectator ion? (NaOH is also present. Is sodiu…

1)Nickel oxide crystallizes in the NaCl type of cystal structure. The length of

1)Nickel oxide crystallizes in the NaCl type of cystal structure. The length of an edge of the unit cell of NiO is 4.18A. What is the NiO bond length? Assuming the anions touch al…

1)Nitric Acid : 5.2mL Copper:1.046 Cu(s)+4HNO 3 (aq)-->Cu(NO 3 ) 2 +2NO 2 (g)+2H

1)Nitric Acid : 5.2mL    Copper:1.046 Cu(s)+4HNO3(aq)-->Cu(NO3)2+2NO2(g)+2H2O(l) Based on the amounts of copper metal and nitricacid used in the first reaction, calculate the n…

1)Obviously, actual chemical elements arent characterized by stars, notches, and

1)Obviously, actual chemical elements arent characterized by stars, notches, and holes. List five physical or chemical properties of the elements that have been used to arrange th…

1)Once acid was added to the supplement, what was the purpose of filtering the s

1)Once acid was added to the supplement, what was the purpose of filtering the solution? A) To remove the solid impurities B) To remove the calcium ion from the solution C) To rem…

1)Order the following species with respect to carbon-oxygenbond length (longest

1)Order the following species with respect to carbon-oxygenbond length (longest to shortest).    CH3OH, CO32- , CO2  ,    CO 2) What is the order from the weakest to the strongest…

1)Ordered: Cardizem 20mg IV for a rapid ventricular rate. Available: Cardizem 5

1)Ordered: Cardizem 20mg IV for a rapid ventricular rate. Available: Cardizem 5 mg/mL after reconstitution. Literature recommends giving each single dose over 2 minutes. What is t…

1)Phosphorus pentachloride decomposes according to the chemical equation,A 0.170

1)Phosphorus pentachloride decomposes according to the chemical equation,A 0.170 mol sample of PCl5(g) is injected into an empty 2.10 L reaction vessel held at 250 °C. Calculate t…

1)Place these events in the correct order from the least recent to the most rece

1)Place these events in the correct order from the least recent to the most recent. If research leading to this invention, event, or finding spanned many years use the date of the…