What are the factors influencing the transport and behaviour of wastes in the environment?

Enthalpy H is a measure of the energy content of a system at constant pressure. Chemical reactions involve changes in enthalpy, ΔH, which can be measured and calculated: ΔHrxn∘=∑productsmΔHf∘−∑reactantsnΔHf∘ where the subscript "rxn" is for "enthalpy of reaction" and "f" is for "enthalpy of formation" and m and n represent the appropriate stoichiometric coefficients for each substance. The following table lists some enthalpy of formation values for selected substances. Substance ΔHf∘ (kJ/mol) NaOH(aq) −469.1 MgCl2(s) −641.8 NaCl(aq) −407.3 Mg(OH)2(s) −924.5 H2O(l) −285.8 Part A Determine the enthalpy for this reaction: MgCl2(s)+2NaOH(aq)→Mg(OH)2(s)+2NaCl(aq) Express your answer in kilojoules per mole to one decimal place. ΔHrxn∘ = kJ/mol SubmitMy AnswersGive Up Part B Consider the reaction Mg(OH)2(s)→MgO(s)+H2O(l) with enthalpy of reaction ΔHrxn∘=37.5kJ/mol What is the enthalpy of formation of MgO(s)? Express your answer in kilojoules per mole to one decimal place. ΔHf∘ = kJ/mol Submit

Use the following information to answer questions 5-10. A student determined the heat of neutralization of copper (II) sulfate (CuSO4) mixed with potassium hydroxide (KOH) using the procedure described part 2 of this experiment. A 150.0 mL sample of a 1.50 M solution of CuSO4 was mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2 °C before mixing and 31.3 °C after mixing. The heat capacity of the calorimeter is 24.2 J/K. Calculate the heat of reaction (ΔHrxn) for this reaction in units of J/mole of copper (II) hydroxide (Cu(OH)2). Assume the solution is dilute enough that the specific heat capacity and density of the solution is the same as that of water, 4.18 J/g∙K and 1.00 g/mL respectively. Calculate the number of moles of copper (II) hydroxide (Cu(OH)2) formed during this reaction. Assume the reaction goes to 100% completion.

Use data in Appendix C in the textbook to calculate ΔH∘ in (kJ/mol) , ΔS∘ in (j/mol-K) , and ΔG∘ in (kJ/mol) at 25 ∘C for each of the following reactions: 2P(g)+10HF(g)→2PF5(g)+5H2(g)

Appendix C:

P(g): dH:316.4; dG: 280.0; S:163.2

HF(g): dH: -268.61; dG: -270.70; S:173.51

PF5(g): dH:-1594.4; dG: -1520.7; S: 300.8

H2(g): dH:217.94; dG: 203.26; S: 114.60

Which of the following ions or atoms possess paramagnetic properties ?

S
Ar^-
S^2-
Ar
Na⁺

Using (Kf=1.2×109) calculate the concentration of Ni2+(aq), assuming that it is present as Ni(NH3)2+6, at equilibrium after dissolving 1.28 gNiCl2 in 100.0 mL of 0.20 MNH3(aq).

Compare and contrast the intravascular and extravascular routes of hemoglobin degradation (identify at least two similarities and at least 3 differences)

What difference between NMR and FTIR in chemical structure characterization?

What is a buffer and how does it work?

I am doing a separation scheme of 4-chloro-3,4-dimethylnonane-1-amine and 4-hodroxy-3-methoxybenzaldehyde (which I think is vanillin). I believe both are starting as a solid. The first molecule and vanillin should be soluble in diethyl ether, while vanillin is soluble in water as well (but the first molecule is not). Would I just need to add water and use gravity filtration, then make the vanillin solid again? I've thought about dissolving both in ether then adding HCl to change the solubility of the first molecule, but I think Vanillin would also react with HCl and both would still be mixed together.

It has been argued by those who do not believe in evolution that a cell could not evolve because such an occurrence would go against the idea that there is a constant tendency in the universe towards spontaneous disorganization (an increase in entropy). How would you counter that argument?

1) Identify cations by selective precipitation and specific reaction of these mixture:

Cu(2+); Bi (3+), Cd (2+), Sb(5+); Sn (2+), Fe(3+), Co(2+), Mg(2+), Li+

2) Calculate the solubility of each of the following compounds in moles per liter. Ignore
any acid–base properties.

PbI2, K(sp) = 1.4 * 10^-8

CdCO3, K(sp)= 5.2 * 10^-12

Sr3(PO4)2, K(sp)= 1*10^-31