Problem 25 - Chemistry Matter and Change

Question

Give the formula for each compound. silver chloride

Step-by-Step Solution

Answer

The formula for silver chloride is AgCl.

Step 1: Identify Elements

The compound given is silver chloride. The elements involved are silver (Ag) and chlorine (Cl).

Step 2: Determine the Charges

Silver typically has a charge of +1 and chlorine typically has a charge of -1 in their common ionic forms.

Step 3: Apply Ionic Charges

Since silver has a +1 charge and chlorine has a -1 charge, they combine in a 1:1 ratio, balancing each other's charges.

Step 4: Write the Formula

Combine the symbols for silver and chlorine, with one atom of each forming the compound. This yields the formula AgCl.

Key Concepts

Chemical Formula

A **chemical formula** represents the composition of molecules and compounds using symbols for the elements involved. Every element in a chemical formula is accompanied by a subscript that indicates the number of atoms of that element present in one molecule of the compound.

Chemical formulas are essential because they provide key information about the proportions of atoms in a substance. They help us understand the basic structure and composition. In ionic compounds, elements combine based on their cationic (positive) and anionic (negative) charges to form neutral compounds. The chemical formula reflects this balance.

• Each element symbol in a formula stands for one atom of that element.
• Subscripts are used to indicate the number of atoms, but if there is only one atom, no subscript is needed.

Understanding chemical formulas is crucial in the study of chemistry as they are the shorthand way to convey structural information about molecules and compounds.

Silver Chloride

**Silver Chloride** is a chemical compound formed between silver (Ag) and chlorine (Cl). It is commonly known for its white crystalline appearance, which can turn gray upon exposure to sunlight due to the formation of metallic silver particles. In chemical terms, silver chloride is an ionic compound.

It is widely used in various applications, such as in photographic films, silver plating, and as an antiseptic in wound care. The formula for silver chloride is **AgCl**, representing the one-to-one ratio of silver ions to chloride ions.

• It forms as a precipitate when solutions containing silver ions are mixed with chloride ions.
• Its solubility is very low in water, which is why it precipitates out of solution.

This compound is a perfect example of how elements combine to form an ionic bond.

Cation and Anion Charges

In ionic compounds, the balance between **cation and anion charges** is fundamental. A cation is a positively charged ion, while an anion carries a negative charge. This opposite charge attraction leads to the formation of ionic bonds, resulting in stable compounds.

For a compound like silver chloride, we need to recognize the charges of the ions involved:

• Silver usually forms a \(+1\) charge, making it a monovalent cation.
• Chlorine naturally forms a \(-1\) charge, making it a monovalent anion.

The charges must balance out to form a neutral ionic compound. Therefore, in silver chloride, one silver ion pairs with one chloride ion. This satisfies both charges, leading to the formation of a neutral compound. Thus, the understanding of ion charges is directly related to the creation of chemical formulas like \(\text{AgCl}\).