It represents a compound in chemical symbols to indicate the elements and the number of atoms present in the compound.
A. molecular formula
B. empirical formula
C. chemical formula
D. atomic formula
The correct answer and explanation is :
The correct answer is C. chemical formula.
Explanation:
A chemical formula is a symbolic representation of a compound that shows the elements involved in the compound and the number of atoms of each element present in a molecule of the compound. It serves as a shorthand for the compound’s molecular composition. Chemical formulas can come in several forms, and the type of formula used depends on the nature of the compound and the information required.
There are a few key types of chemical formulas:
- Molecular Formula: This is a specific type of chemical formula that represents the exact number of atoms of each element in a molecule of the compound. For example, the molecular formula of water is H₂O, indicating that each molecule consists of 2 hydrogen atoms and 1 oxygen atom.
- Empirical Formula: This formula represents the simplest ratio of elements in a compound, but not necessarily the exact number of atoms in a molecule. For instance, the empirical formula of hydrogen peroxide (H₂O₂) is HO, as the ratio of hydrogen to oxygen is 1:1.
- Chemical Formula: This term generally refers to both molecular and empirical formulas and can be used to describe either form. It is the most inclusive term, as it encompasses any type of formula that represents the chemical composition of a compound.
- Atomic Formula: This term is sometimes used to describe the formula of compounds that consist of a single type of atom, such as elemental substances. For example, the atomic formula for oxygen gas (O₂) indicates two oxygen atoms bonded together.
The chemical formula is an essential tool in chemistry as it provides crucial information about a substance, including its composition and how many atoms of each element are present. It is vital for understanding the properties, behavior, and reactions of the substance in different chemical processes.