Try Again Your answer is incorrect. • Compound CoCO3: Your answer is incorrect. • Compound NiSO4: Your answer is correct. It is traditional to write the number part of the charge first in an ion symbol. • Compound CrS2: Your answer is correct. It is traditional to write the number part of the charge first in an ion symbol. • Compound VBr3: Your answer is correct. It is traditional to write the number part of the charge first in an ion symbol. Complete the table below by writing the symbols for the cation and anion that make up each ionic compound. The first row has been completed for you. ionic compound Na Cl CoCO3 NiSO4 CrS2 V Br3 Explanation Recheck
The Correct Answer and Explanation is:
Here is the completed table with the correct cations and anions for each ionic compound:
| Ionic Compound | Cation | Anion |
|---|---|---|
| NaCl | Na⁺ | Cl⁻ |
| CoCO₃ | Co²⁺ | CO₃²⁻ |
| NiSO₄ | Ni²⁺ | SO₄²⁻ |
| CrS | Cr²⁺ | S²⁻ |
| VBr₃ | V³⁺ | Br⁻ |
Explanation (300 words):
Ionic compounds consist of positively charged ions (cations) and negatively charged ions (anions) held together by electrostatic attraction. To correctly determine the ions in an ionic compound, one must understand how to interpret chemical formulas and oxidation states.
- NaCl is composed of sodium (Na) and chlorine (Cl). Sodium loses one electron to form Na⁺, and chlorine gains one to form Cl⁻. Since both ions have charges of one in opposite directions, they combine in a 1:1 ratio.
- CoCO₃ contains cobalt and the carbonate polyatomic ion. CO₃²⁻ is a polyatomic ion with a 2⁻ charge. For the compound to be neutral, cobalt must provide a 2⁺ charge, forming Co²⁺. Therefore, the ions are Co²⁺ and CO₃²⁻. Note that the charge is written with the number first (2⁺) according to standard notation.
- NiSO₄ involves nickel and the sulfate ion. SO₄²⁻ is the sulfate ion with a 2⁻ charge. To balance the charge, nickel must be Ni²⁺. This pairing confirms the compound is electrically neutral.
- CrS includes chromium and sulfur. Sulfide (S²⁻) carries a 2⁻ charge. Therefore, chromium must be Cr²⁺ to balance the overall charge. This makes CrS a neutral ionic compound.
- VBr₃ is made up of vanadium and bromine. Each bromide ion is Br⁻ with a 1⁻ charge. Since there are three bromides, the total negative charge is 3⁻. Therefore, vanadium must have a 3⁺ charge, written as V³⁺, to create a neutral compound.
In all cases, the total positive and negative charges must balance. It is important to follow naming conventions by writing the number before the sign in the ion symbols.
