General Chemistry Answers

a.      Formic acid, which is a component of insect venom, has a Ka = 1.8 x 10^-4. What is the [H3O⁺] in a solution that is initially 0.20 M formic acid, HCOOH?  (4 pts.)

                HCOOH_(aq)  +  H₂O_(l)   ⇌   H₃O⁺_(aq)    +    HCOO^–_(aq)

(acid-base equilibria)

A research chemist adds a measured amount of HBr gas to pure water at 25^oC and obtains a solution with [H₃O⁺] = 8.3x10^-4 M. Calculate [OH^-]. Is the solution acidic, basic, or neutral? 

Describe what one would see at pressures and temperatures above 2.0 atm and 450 K.

95 ppm concentration is found in a solution with a total volume of 1500 mL, calculate the unknown volume of solute.

Refer to the First Law of Thermodynamics. Decide whether the statement below is TRUE or FALSE. Support your answer.

"Our energy supply is running out."

How many number of moles of oxygen atoms in 2.40mg of ozone

1. Write the electron configuration for iridium using orbital diagram techniques?

2. Using the spdf notation,write the electron configuration of iodine?

3. Which two of these elements would you expect to show the greatest similarity in chemical ang physical properties: B,CA,F,He,Mg,P?

4.A biochemist who is studying the properties of certain sulfur S-containing compounds in the body wonders whether trace amounts of another nonmetallic elements might have similar behavior. To which element should she turn her attention?

(a)F (b)As (c)Se (d)Cr (e)p

5. Chlorine is a halogen. Locate this element in the periodic table.

(A) What is it's symbol?

(B) Period and group where it is located?

(C) What is it's atomic number?

(D) Is it a metal or nonmetal?

Determine the volume of ethyl alcohol required to prepare 250 mL of a 45% by volume solution.

What mass of water is consumed by the reaction of 9.04 g of carbon dioxide?

How many grams of Cu(OH)2 will precipitate when excess Ba(OH)2 solution is added to 77.0 mL of 0.678 M Cu(NO3)2 solution?