chemistry

Write the compound formulas for each of the following pairs and the name of the compound formed when the elements or radicals combine.

Mg+2 + OH-1
K+1 + PO4-3
Cu+2 + S-2
N+5 + O-2

Compounds have zero charge. Therefore, for magnesium hydroxide, the first one, it will be Mg(OH)2.
Mg is +2 and 2 OH at -1 each makes -2 and +2 + (-2) = 0. I shall be happy to check the others for you.

K+1 + PO4-3= K(PO4)Phosphoric acid
Cu+2 + S-2= CuS Copper(II)Sulfide
N+5 + O-2= NO3 Ammonia

N+5 + O-2= NO3 Nitrate

You need to redo these. All are incorrect. Both formulas and names are incorrect. For the first one, note the charge. You have one +1 charge for K and one -3 charge for PO4^-. That doesn't add to zero. You must have three of the +1 (to make +3) so it will add to one of the -3 to make zero.
K3PO4 is the formula. I KNOW that isn't hard so you must have something else about the procedure causing trouble. Explain in detail so I will know where to start. As for the names, name the + ion first and the negativae ion next. For polyatomic ions, here is a site that will help.

http://www.woodrow.org/teachers/chemistry/links/chem1/PolyatomicIonsChart.html

I stand corrected. CuS is the correct formula for copper(II) sulfide and you have the correct name for it also.

K+1 + PO4-3= K3PO4 potassium sulfate
N+5 + O-2= NO nitrogen(II)oxide
I added -3 to the O-2 to get a negative 5

1. K3PO4 is correct. The name, however, is not. Look again at the link I gave you for polyatomic ions and look up PO4^-3 ion.

2. You CHANGED the number on O and you can't do that. If O is listed as -2, then a -2 it is and it must stay a -2.
N is +5
O is -2
10 is the lowest common multiple. How many N must we have to make 10. How many O must we have to make 10. Will that make it zero. Another way to do this is to cross the numbers. That works this way. I'll show you on the K3PO4.
Write the valences just above the letter, something like this.
K+1PO44-3
Now, mentally, form a large X so that the top of the left part of the X is the +1. Bring that number down (not the sign) to the bottom of that line. So a 1 is the subscript for PO4. The -3 is at the top of the right hand side of the X. Bring it down to the left and it becomes the subscript for K. Again, ignore the sign and the number is 3. The final product looks like this
K3(PO4)1.
Of course, when the number is 1 it isn't needed and the final formula would be K3PO4. Try that method on the N and O and see if ti works better for you.

N+5 O-2
X
2 5 = N2O5
and the name for K3PO4 is potassium phosphate?

N2O5 is right.
potassium phosphate is right.
The name for N2O5. The
"old" name was nitrogen pentoxide, and some still name it that way, but the new name is dinitrogen pentoxide.

  1. 👍 0
  2. 👎 0
  3. 👁 131

Respond to this Question

First Name

Your Response

Similar Questions

  1. 11th chemistry

    The chlorination of ethane gives a compound with the percent composition by mass of chlorine in the compound is 71.7% A) find the molecular formula of this compound B) write the condensed structural formulas of the isomers of this

    asked by angy on March 7, 2016
  2. smk lutong

    A compound consists only of carbon, hydrogen, nitrogen, and oxygen.  Combustion of 10.68 g of the compound  produced 16.01 g carbon dioxide and 4.37 g of water.  the molsr mass of the compound is 176.1

    asked by nadeen on September 16, 2013
  3. chemistry

    An orgnaic compound contains C, H, No, and O. Combustion of 0.1023 g of the compound in excess oxygen yielded 0.2766 g of CO2 and 0.991g of H2O. A asample of 0.4831 g of the compound was analyzed for nitrogen by the Dumas method.

    asked by kaliegh on December 9, 2007
  4. READING

    Underline each compound subject once and each compound predicate twice. Then write compound subject or compound predicate. 1. swimming and softball are two sports_ in the Olympic Games.= (COMPOUND SUBJECT) 2. The swimmer's_ skill

    asked by 3 GRADE on October 14, 2010
  5. chemistry

    Some properties of the two compounds are listed below: Melting point- Compound X= -114*C Compound Y= -138*C Boiling Point- Compound X= 78*C Compound Y= -22*C Net Dipole?- Compound X= Yes Compound Y= Yes Functional group: Compound

    asked by LeePyeonggang on February 10, 2010
  6. chemistry

    Which of the following describes the compound Mn(NO2)2? If the compound dissolved in water it would be a strong electrolyte. The compound is ionic. The compound would conduct electricity if molten. The compound is molecular. The

    asked by Jesus on February 18, 2009
  7. Chemistry

    I did the work, but I need help checking it... A compound contains 83.24% by mass carbon. Calculate the molar mass of the compound if it contains 5 moles of carbon per mole of compound. This was my process: I took 100g of compound

    asked by Kyle on January 26, 2012
  8. chemistry

    Determine the percent yield for the following generic reaction using the information given below: Compound A --> Compound B if you start with 10.0 mL of Compound A and obtain 9.0 g of Compound B. Density of Compound A = 0.75 g/mL

    asked by Anonymous on April 30, 2015
  9. chemistry

    Two different chloride compounds of platinum are known, compound X and Y. When 3.45g of compound X is heated, 2.72g of compound Y is formed to 1.99g of platinum metal and some more chlorine gas. Determine the formulas of compounds

    asked by Chansa on May 4, 2016
  10. Chemistry

    My teacher wants me to solve this but she/he never thought us how so I need help solving this because I’m kind of confused on what to do and how to do it. 1. Write the correct formulas for the following: A. A compound composed

    asked by Ummm on December 12, 2017
  11. chemistry

    Based on molecular mass and boiling point of the five compounds in the table below, which should have the high? est dipole moment: first # molecular mass 2nd: boiling point compound 1 244 203 compound 2 346 255 compound 3 250 138

    asked by ben on December 13, 2010

More Similar Questions