The formula for dimethoxyethane (dme) is H3COCH2CH2OCH3 and the formula for

N,N,N',N'-tetramethylethylenediamine (tmeda) is (H3C)2NCH2CH2N(CH3)2.

Tmeda is water-soluble. Is tmeda a strong acid, weak acid, strong base, weak base, or none of these? Briefly justify your choice.

Is dme polar? Justify your choice.

Is tmeda polar? Justify your choice.Is dme more polar, less polar, equally polar, or cannot be determined compared with tmeda? Justify your choice.

Assume that you have 0.480 mol of N2 in a volume of 0.700 L at 300 K .

1)Calculate the pressure in atmospheres using the ideal gas law.

2)Calculate the pressure in atmospheres using the van der Waals equation. For N2 , a=1.35 (L2⋅atm)/mol2 , and b=0.0387 L/mol .        

A magic number is the name given to certain numbers of protons or neutrons that have a high correlation to stability in nuclei:

magic numbers of protons:magic numbers of neutrons:2,8,20,28,50,822,8,20,28,50,82,126,184

A plot of the number of neutrons versus the number of protons for all known stable nuclei, represented by reddish brown dots on the graph, shows that these nuclei cluster together in a region known as the valley of stability. Nuclei with a ratio that is too high tend to undergo beta decay. Nuclei with a ratio that is too low tend to undergo positron emission or electron capture.

Part A

Using general trends, predict the stability of the following nuclei.

Drag the appropriate items to their respective bins, which are Stable and Radioactive

Radium-228, Bromine-82, Sulfur-32,Chlorine-36, Zinc-64

Nuclei with Z≥84 tend to undergo α emission.

Nuclei with high n/p ratios undergo β (  0−1e) emission.

Heavy nuclei with low n/p ratios are more likely to undergo electron (  0−1e) capture.

Light nuclei with low n/p ratios are more likely to undergo positron (01e) emission.

The classification "high" or "low" n/p ratio can be determined by finding the coordinates on the graph that correspond to the number of protons (x or horizontal value) and neutrons (y or vertical value) in a given isotope. Then, observe whether this set of coordinates is above, within, or below the stability valley.
Use this information to solve Part B.

Part B

Using general tendencies and the chart given in the introduction, predict the most likely mode of decay of each of the following radioactive isotopes.

Drag the appropriate items to their respective bins, which are Alpha Decay, Beta Decay, 0/1 e emission, 0/-1 e capture

Iodine-134, Potassium-47,Americium-241,Platinum-183, Fluorine-17

THANK YOU!

perfectly insulated container with no heat capacity is used to mix together the following three samples of water:

I.183.2 grams of water at 23.2 °C

II.32.1 grams of water at 14.2 °C

III.143 grams of water at an unknown temperature.

After the three samples are combined, the final temperature of the combined solutions is 39.0 °C. What is the temperature of sample III before the samples were mixed together?

Select all of the correct statements about reaction rates from the choices below.

A. The lower the rate of a reaction the longer it takes to reach completion.


B. A balanced chemical reaction is necessary to relate the rate of disappearance of a reactant to the rate of appearance of a product.


C. The fastest step in a reaction is called the rate-determining step.


D. The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step.


E. The rate of a reaction is the same as the rate constant of the reaction.


F. Solid catalysts do not affect reaction rates.


G. Reaction rate constants increase with increasing temperature.

The amino acid glutamic acid has the molecular formula C5H9NO4, and the amino acid isoleucine has the molecular formula C6H13NO2. Determine how many moles of isoleucine contain the same number of atoms as 1.96 mol of glutamic acid.

How much ice (in grams) would have to melt to lower the temperature of 354 mL of water from 26 ∘C to 6 ∘C? (Assume the density of water is 1.0 g/mL.)

Piperazine, HN(C4H8)NH, is a diprotic weak base used as a corrosion inhibitor and an insecticide and has the following properties:

pKb1=4.22 pKb2=8.67

For writing the reactions of this base in water, it can be helpful to abbreviate the formula as Pip:

Pip+H2OPipH++H2O??PipH++OH?PipH22++OH?

The piperazine used commercially is a hexahydrate with the formula C4H10N2?6H2O.

a. Calculate the pH after 2.575mL of HCl have been added.

b. Calculate the pH when 12.875mL of HCl has been added.

c. What is the pH at the first midway point?

please don't copy and paste that yahoo answers bs, it doesn't give the right answer.

The corrosion of rebar inside concrete structures is serious issue for the safety and stability of bridges and buildings. The chemistry of corrosion is complex, but a simplified chemical model (iron rusting) is: 4Fe (s) + 3O2 (g) ⟶ 2Fe2O3 (s) ∆H = −1.65 × 103 kJ a) How much heat is released when 1.00 pound of iron rusts? b) If 6.25 × 104 kJ is released, how many kilograms of iron have rusted?

A photometer with a linear response to radiation gave a reading of 690 mV with a blank in the light path and 101 mV when the blank was replaced by an absorbing solution. Calculate

the transmittance and absorbance of the absorbing solution.

Transmittance =

Absorbance =

the expected transmittance if the concentration of absorber is one half that of the original solution.

Transmittance =

the transmittance to be expected if the light path through the original solution is doubled.

Transmittance =

Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,?,m?,ms).

Check all that apply.

What is the pH of the solution formed when 30.0 g of potassium nitrite (KNO2) is dissolved in 1.00 L of water.

Examples of chemical equilibrium in Nature or in our daily environment (homogeneous and heterogeneous). Can you find examples with small and large extent?

In gluconeogenesis, pyruvate is converted to PEP in two reactions. These reactions include an initial carboxylation followed by a decarboxylation in the second reaction. Based on these two reactions, you would assume that if radio-labeled 14CO2 was present in the reactions, it would not be incorporated into PEP. However, when 14CO2 is present with rat liver cells 14C slowly begins to appear in PEP and eventually on carbons 3 and 4 of glucose. Diagram a series of reactions that would explain this observation. You need to clearly show the location of the radiolabeled 14C in all reactions and indicate any changes in localization with the cells