champagneeagle35

What kind of attractive forces must be overcome in order to (a) melt ice (b) boil molecular bromine (c) melt solid iodine (d) dissociate F₂ into F atoms.

When you are calculating water hardness, all the compounds in the water are considered to be______ ?

a) Hydrates

b) CaCO3

c) MgCO3

d) Limestone

What are the balanced equations for 

PCi3+CI2 ---> PCI5

GaBr3 + CI ---> GaCI3 +Br

hydrolsis stepwise reaction of  

Which of these molecules has a shape related to a tetrahedron?

a. and  

b.  

c. and  

d.  

In general how could you identify a compound as an alkane, alkene, alkyne, or arene using IR?

Check the pair of species where the first member is smaller in diameter than the second member.

Choose one answer.

a.

b.

c.

d.  

1. Why astaxanthin is important for human nutrition?

2. What are the main limitations to encapsulate astaxanthin and obtain stable formulations?

3. What we understand by response surface methodology?

4. How RSM correlates with the previously discussed paper about NP and nano-machinery of cells?

5. What was the benefit of the X-ray diffraction study?

Rank the following ionic compounds by their expected lattice energy, from weakest to strongest:

Hello, if anyone could help me figure out how to do this without having to look stuff up online, that would be great. I will have to be able to do problems like these with only a basic periodic table in front of me and no other information given. Thank you in advance!

For the reaction   at , the   of the reaction is and the  . Use the given concentrations to determine the following.  

(a) Determine the of the reaction. 

(b) Determine which direction the reaction will proceed in order to reach equilibrium.

Select the strongest base in the following:
A)  
B)  
C)  
D)  

hi...I'm from India and am currently studying in first-year junior college.
Now, where I am stuck is that "it is observed that boiling points of hydrides decrease with the decrease of molecular weights with exception of , , and . Why is it so? Please explain?

7. For the given, gaseous rxn:  

What would be the expected shift in equilibrium if pressure were increased and temperature were increased?

a. Definite shift to the right
b. Definite shift to the left
c. Indeterminate

please explain.

For the general electron-dot formula for the element, give the following information: 

Hydrogen bonding will broaden the   absorption band in an infrared spectrum

A.) True

B.) False

When is added to   at in a calorimeter, the temperature of the aqueous solution increases to  . Assuming that the specific heat of the solution is , that its density is , and that the calorimeter itself absorbs a negligible amount of heat, calculate the amount of heat absorbed for the reaction.

Fish generally need an Oz concentration in water of at least for survival. What partial pressure of oxygen above the water (in atmospheres at 0 °C) is needed to obtain this concentration? The solubility of Oz in water at 0°C and 1 atm partial pressure is . 

 An antacid tablet weighing was dissolved and diluted to in a volumetric flask. A aliquot was removed with and treated with 8-hydroxyquinoline to precipitate all of the aluminum and magnesium. After proper collection and drying, this precipitate weighed . Another aliquot of the sample was treated with enough ammonia to precipitate just . After ignition at , this precipitate weighed . Calculate the and in the antacid.

The partial pressure of water vapor is at a body temperature ( ). If the barometric pressure is , what is the partial pressure of oxygen in the lungs of a patient inspiring a gas mixture containing oxygen? A student calculated the correct answer to be . Is this true?

Assuming equal concentrations, rank these solutions by from highest to lowest

, , , , and  

When the three ions , , and are arranged in order of increasing ionic radius, which is the correct order?
Choose one answer.
a. , , 
b. , , 
c. , , 
d. , , 

What is the solubility of iodine in water. Give source?

(Preferrably from the Handbook of Chemistry and Physics)

5. How many milliliters of a solution of must be used to make of a solution that has a concentration of ?

DO NOT use scientific notation. Always report your answer with significant figures.

6. A sample of a solution of was diluted with water to . A sample of the dilute solution was found to contain . What was the concentration of in the original undiluted solution?

DO NOT use scientific notation. Always report your answer with significant figures.

1. Given the partition coefficient between ethyl acetate and water for Compound A is , what mass of A, to the tenths place, would be extracted from a solution of water containing of A using ethyl acetate? (2 pt)

Why benzyne is so unstable ?

How many grams of will dissolve in of water? The  

(A)  
(B)  
(C)  
(D)  
(E)  

Why do we use molality rather than molarity in our concentration unit in a freezing point depression experiment.

Determine whether the metal of an ionic compound forms only one type of iron or more than one type of iron 

If and   , solved for . Do I use the of (assuming and are equal) to find the concentration of , the plug into the of ?

A student weighs out , dissolves the sample in deionized water and titrates it with   solution. If the titration requries solution, and none of the impurities react with NaOH, what is the percent KHP in the sample?

Using the dilution expression (   or ) calculate the volumes of and   needed, given that the actual concentrations of these reagents available in lab (   and ) are different from the concentrations called for in the original procedure ( and ). Finally, scale the resulting volumes down by the factor calculated in (1) above. Report your volumes to the nearest .

A certain solution of liquids A and B containing of A forms an ideal solution. the vapor above the solution in equilibrium with it contains of A, and the heat vaporization of A and B and respectively. Calculate the ratio of the vapor pressure of pure A to that of pure B.

An acid has . The ionization of this acid in a solution of the acid in water is closest to?

a.  
b.  
c.  
d.  
e.  
f.  

at the volume of a gas is . at the same pressure, its volume is at what temperature?

A sample of solid A was placed in a sealed container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached , where it remained constant.

Then, the container volume was doubled and equilibrium was re‑established. How many moles of A remain?

The reaction is a first-order reaction. At  , the rate constant is . If we start with a concentration of equal to , what will the concentration be after ?

Find moles of .

Find the equilibrium concentrations of A, B, and C for a = 1, b = 1, and c = 1 . Assume that the initial concentrations of A and B are each 1.0 M and that no product is present at the beginning of the reaction.

1. Use the information provided to determine the empirical and molecular formula for each of the following:     
   
   a. 39% carbon, 3.47% hydrogen, and 55.14% oxygen; experimental molar mass: 116.07g
   
   b. 53% carbon, 9.15% hydrogen, and 36.32% oxygen; experimental molar mass: 88g;
   
   c. 27% carbon, 7.19% hydrogen, and 28.54% oxygen; experimental molar mass 168.19g
   
   d. A hydrocarbon containing 17.4% hydrogen by mass, with a molar mass of 58.1g.

Why flurin is gas and iodin is solid at room temperature?