In organic chemistry, we have ortho/para activators and deactivators. Why do we not have meta activators?

Indicate the concentration of each ion present in the solution formed by mixing the following. (Assume that the volumes are additive.)

(a) 40 mL of 0.100 M HCl and 10.0 mL of 0.600 M HCl

H⁺ ________ M

Cl ^- ________ M


(b) 15.0 mL of 0.300 M Na₂SO₄ and 20.6 mL of 0.200 M KCl

Na⁺ _________ M

K⁺ __________ M

SO₄^2- __________ M

Cl ^- __________ M


(c) 3.50 g of NaCl in 40.6 mL of 0.365 M CaCl₂ solution
Na⁺ ___________ M

Ca²⁺ __________ M

Cl ^- __________ M

Calculate the hydronium ion concentration and the pH when 65.0 mL of 0.45 M NH3 is mixed with 65.0 mL of 0.45 M HCl (Ka = 5.6x10^-10).

Concentration =

pH=

In my text book it states: The relative atomic mass of an element is the average mass of an atom of the element, taking into account all its isotopes and their relative abundance, compared to one atom of carbon 12. At the same time it states that generally, the relative atomic mass is the mass of one mole of atoms of an element. So is it the mass of one moles of atoms of an element or the average mass of an atom of the element?

MATCH EACH TYPE OF CRYSTALLINE SOLID TO THE APPROPRIATE EXAMPLE: 1. ATOMIC 2.METALLIC 3.IONIC 4. NETWORK COVALENT 5.MOLECULAR

A)C (GRAPHITE) B)N2 C)Kr D)Au e)MgBr2

Distinguish linear range, dynamic range, and range.

The pH of a 0.120 M solution of a weak base is 10.97 at 25ºC. Calculate the pH of a 0.0316 M solution of this base at 25ºC.

derive BET isotherm adsorption equation step by step

7.) You need to make an aqueous solution of 0.140 M nickel(II) sulfate for an experiment in lab, using a 250 mL volumetric flask. How much solid nickel(II) sulfate should you add?

How many milliliters of an aqueous solution of 0.175 M sodium hydroxide is needed to obtain 5.85 grams of the salt?

8.)

In the laboratory you dissolve 14.0 g of nickel(II) sulfate in a volumetric flask and add water to a total volume of 250 mL.

What is the molarity of the solution?
What is the concentration of the nickel cation?

What is the concentration of the sulfate anion?

b.) In the laboratory you dissolve 17.5 g of sodium hydroxide in a volumetric flask and add water to a total volume of 125 mL.

What is the molarity of the solution?

What is the concentration of the sodium cation?

What is the concentration of the hydroxide anion?

Calculate the change in pH when 75.0 mL of a 0.620 M solution of NaOH is added to 1.00 L of a solution that is 1.00 M in sodium acetate and 1.00 M in acetic acid.

Polarimetry Lab calculations:

I would like some help to figure out how to do this; I want to make sure that I am doing it correct. Here is what I have done so far:

1. Find specific rotations for all the isomers:

I believe these are the equations to use:

X _observed= X _raw - Blank             l= 0.8 dm and c= 0.9600 g/cm³

[X]= X _observed / lc

Can someone show me the calculations for all of them, this is what I did for Unknown:

My Unknown (X): I did x observed= 175.25-200.75= -25.5°

[X]= X _observed / lc -25.5°/(0.8*0.9600)= -33.20°

2. Find the Enantiomer Excess:

The equations our teacher gave were:

EE= [X] _observed / [X]_pure * 100

([X]_pure can be found by [X]= X_pure/ lc

I don’t know how to find x pure. What even is that, where can I get it from the numbers. After I get EE,

I need to find how much of (-) and (+) is in the enantiomer (the equation given for that is

EE= [X]₊ XA + [X]_- (1-X₊)

[X]₊ and [X]_- are supposed to be answers from number 1.

Please compare and contrast intrinsic versus extrinsic fluorophores. Please be sure to clearly address differences in terms of quantum yield, fluorescence lifetimes, cost, etc.

The dehydration of 2-methyl-2-butanol in sulfuric acid produces 2 elimination products. However, this same reaction can also undergo substitution. What is the product of the substitution reaction?