1) Write the formula for the ionic compound formed from the combination of each

Question

1) Write the formula for the ionic compound formed from the combination of each pair of ions and give the systematic name for that compound (if the transition metal is used give both the new and older name for it).

a.Ca^2+ and PO4^3-

b. Cu^2+ and Cr2O7^2-

2) Determine the formula mass for the compound, pb (c2h302)4. Make sure to show all your work and use proper units.

3) Determine percent composition for each of the elements in Co2(HPO4)3.

4) You have a 12.00 gram sample of an oxide of copper CuxOy. This sample contains 1.34g of oxygen. Determine the simplest formula for the compound.

5) Balance the following equations by inspection:

Cu(NO3)2 -> CuO + NO2 + O2

P4S3+ O2 -> P4O10 + SO2

Mg3N2 + H2O -> Mg(OH)2 + NH3

6) Magnesium (Mg) reacts with fluorine gas (F2). This produce magnesium fluoride (MgF2). How many grams of Mg will react with 3 moles of F2?

Mg(s) + f2(g) -> MgF2(s)

7) The compound ethane, C2H6, will react with oxygen to produce CO2 and H2O. The unbalanced chemical equation is shown below.

C2H6 + O2 -> CO2 + H2O

8) Hydrochloric acid reacts with oxygen gas to from water and chlorine gas. What mass of chlorine gas can be made from the reaction of 9.00g HCL with 12.0g O2?

4HCL (aq) + O2 (g) -> 2H2O (l) + 2Cl (g)

9) What should you final volume be in you want to dilute 60.0 mL of 8 M CH3OOH (acetic acid) solution to a final 0.200 M Ch3OOH solution?

Explanation / Answer

Ans 1 :

The chemical formula of the compound can be determined by the number and oxidation state of the constituent atoms.

So the formulas and names are :

Ca3(PO4)2 : Calcium phosphate

CuCr2O7 : Copper dichromate

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