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

Ammonia reacts with oxygen according to the equation: 4NH3(g)+5O2(g)→4NO(g)+6H2O(g) ΔHrxn=-906 kJ Part A Calculate the heat (in kJ) associated with the complete reaction of 284 g of NH3. Express your answer with the appropriate units.

What happens to the pressure of a gas when T is halved and volume is doubled

1.It is ¼ of its initial value

2.It is 4 times its initial value

3.It is ½ of its initial value

4.It is 2 times its initial value

5.It is ¾ of the initial value

6.It remains the same.

Please show work

A laser puts out 4.4 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.1 mm

If the laser is pointed toward a pinhole with a diameter of 1.0 mm, how many photons travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-divisional area of the beam. (1 W = 1 J/s)

A 2.85 g lead weight, initially at 11.0 ∘C, is submerged in 7.43 g of water at 52.2 ∘C in an insulated container. You may want to reference ( pages 349 - 355) section 10.4 while completing this problem. Part A What is the final temperature of both the weight and the water at thermal equilibrium? Express the temperature in Celsius to three significant figures. T = ∘C

A sample containing 4.10 g of O2 gas has an initial volume of 21.0 L . What is the final volume, in liters, when each of the following changes occurs in the quantity of the gas at constant pressure and temperature?

A) A sample of 0.300 mole of O2 is added to the 4.10 g of O2 in the container. Express the volume in liters to three significant figures.

B). A sample of 2.20 g of O2 is removed from the 4.10 g of O2 in the container. Express the volume in liters to three significant figures.

C). A sample of 2.20 g of O2 is added to the 4.10 g of O2 gas in the container. Express the volume in liters to three significant figures.

Calculate the solubility (in g·L–1) of CuBr(s) (Ksp = 6.3× 10–9) in 0.57 M NH3(aq).