Prefixes from 1-10: 1- Mono, 2-Di, 3 – Tri, 4 – Tetra, 5 – Penta, 6 – Hexa, 7 – Hepta, 8 – Octa, 9 – Nona, 10 – Deca Formula Covalent Compound Name (3 points each) PO 10 CZNA N H, Please name the following ionic compounds, use the rules below as a guide to help. Step 1) Say the name of the CATION (the first part of the formula). Step 2) Say the name of the ANION and replace the ending with “ide”. Hint: If a polyatomic ion is used, DO NOT change the ending. REMEMBER to check to see if the compound needs a roman numeral using the charton the back of your periodic table or in the slideshow. If the compound needs a Roman Numeral: Step 1) Determine the charge of the ANION. Step 2) Determine the charge needed on the CATION to make the compound neutral. Step 3) Place the roman numeral, equal to the charge of the CATION, in the name of the compound. Formula Ionic Compound Name (3 points each) V,0 Baz(PO)2
The Correct Answer and Explanation is :
Here are the correct names for the given compounds:
Covalent Compounds:
- PO₁₀ → Phosphorus Decoxide
- “P” represents phosphorus and “O” represents oxygen.
- The “10” prefix corresponds to Deca, so “oxide” (oxygen in a compound) becomes Decoxide.
- C₂N₄ → Dicarbon Tetranitride
- “C₂” represents Dicarbon (Carbon with the prefix for 2 = “Di”).
- “N₄” represents Tetranitride (Nitrogen with the prefix for 4 = “Tetra”).
- NH → Nitrogen Monohydride
- “N” represents Nitrogen.
- “H” represents Hydride (Hydrogen in a compound).
- Since there is only one hydrogen atom, the Mono- prefix is used.
Ionic Compounds:
- V₂O₅ → Vanadium (V) Oxide
- “O” represents oxide (oxygen in ionic compounds gets the “-ide” ending).
- Oxygen has a charge of -2, and since there are 5 oxygens, the total negative charge is -10.
- There are 2 vanadium (V) atoms, meaning each must be +5 to balance the charge.
- Since Vanadium is a transition metal with multiple oxidation states, we include the Roman numeral (V).
- Ba₂(PO₄)₂ → Barium Phosphate
- “Ba” is Barium, which has a fixed +2 charge.
- “(PO₄)” is Phosphate, a polyatomic ion with a charge of -3.
- Since polyatomic ions do not change their names, it remains Phosphate.
- The charges balance correctly, so no Roman numeral is needed.
Explanation (300 Words)
Covalent compounds use prefixes to indicate the number of atoms of each element. The first element keeps its name, and the second element ends with “-ide.” If the first element has only one atom, the prefix “Mono-” is omitted. Examples include Phosphorus Decoxide (PO₁₀) and Dicarbon Tetranitride (C₂N₄).
Ionic compounds consist of a metal (cation) and a nonmetal or polyatomic ion (anion). The metal name is stated first, followed by the modified name of the nonmetal with “-ide.” If a polyatomic ion is present, its name remains unchanged. Some metals, mainly transition metals, require Roman numerals to indicate their charge, as they can have multiple oxidation states.
For V₂O₅ (Vanadium (V) Oxide), oxygen’s charge is -2, leading to a total of -10. To balance this, each vanadium atom must be +5, requiring a (V) Roman numeral.
For Ba₂(PO₄)₂ (Barium Phosphate), barium has a fixed +2 charge, and phosphate (PO₄³⁻) has a -3 charge. Since polyatomic ions retain their names, phosphate stays unchanged. Roman numerals are unnecessary because barium has only one oxidation state.
Understanding these naming rules ensures clarity when writing chemical formulas and distinguishing between different compounds.