# 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.

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. 👍
2. 👎
3. 👁

## Similar Questions

1. ### chemistry

Which of the following formulas -- NO, N2O, NO2, N2O, N2O4, AND N205 -- represent the empirical and molecular formulas of the same compound?

2. ### Chemistry

Which of the following pairs of atoms would you expect to combine chemically to form an ionic compound? A.Li and S B.O and S C.Al and O d.F and Cl e.I and K F.H and N Which of the following pairs of elements will not form ionic

3. ### Chemistry

A compound containing only carbon, hydrogen and oxygen is subjected to elemental analysis. Upon complete combustion, a .1804g sample of the compound produced .3051g of CO2 and .1249g of H2O. What is the empirical formula of the

4. ### chemistry

3-pentanol is heated with sulphuric acid (H2SO4) to become compound M. Compound M is reacted with Br2/ H2O to form Compound N. Outline the reaction step and name the compound M and N

1. ### English

Identify the structure used in each of the sentences below. 1. The hamburger came from Hamburg, Germany, and the hot dog came from Frankfurt. simple compound complex compound-complex 2. The idea of placing meat on a bun, however,

2. ### Chemistry

The percent composition by mass of an unknown compound with a molecular mass of 60.052 amu is 40.002% C, 6.7135% H, and 53.284% O. Determine the compound's empirical and molecular formulas.

3. ### Chemistry

2) What is the empirical formula of a compound containing C, H, O if combustion of 1.23g of the compound yields 1.8g CO2 and .74g of H2O 3) What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10g of

4. ### Chemistry

Answer these questions about NaCl also known as table salt: 1. What is the name of the compound? 2.Are there any other names that it is known by? If yes, then please list them. 3.What is the chemical formula of the compound? Is it

1. ### Chemistry

Please help I have no idea how to do this. There are three different dichloroethylenes (molecular formulaC2H2Cl2), which we can designate X, Y, and Z. Compound X has no dipole moment, but compound Z does. Compounds X and Z each

2. ### eNgLiSh EEEEEEE

Correctly label the below as simple, complex, compound, compound-complex, or sentence fragment. Vampires Dairies is my favorite television show, but I also love True Blood. compound Juan, Sam and Marie went to a movie, ate

3. ### 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

4. ### 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