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Chemical Formulas

Chemical Formulas

A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.

Chemical Equations

Chemical Equations

Chemical equations represent the identities and relative quantities of substances involved in a chemical reaction. The substances undergoing reaction are called reactants, and their formulas are placed on the left side of the equation. The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation. Plus signs (+) separate individual reactant and product formulas, and an arrow (→) separates the reactant and product (left and right)...

Chemical Reactions

Chemical Reactions

A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them...

Types of Chemical Bonds

Types of Chemical Bonds

Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O.

Physical and Chemical Properties of Matter

Physical and Chemical Properties of Matter

The characteristics that enable us to distinguish one substance from another are called properties.

Experimental Determination of Chemical Formula

Experimental Determination of Chemical Formula

The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most concise way of representing this elemental makeup. When a compound’s formula is unknown, measuring the mass of its constituent elements is often the first step in determining the formula experimentally.

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Related Experiment Video

Updated: Feb 3, 2026

Rapid Identification of Chemical Genetic Interactions in Saccharomyces cerevisiae

Rapid Identification of Chemical Genetic Interactions in Saccharomyces cerevisiae

Published on: April 5, 2015

Target Identification Using Chemical Probes.

Moses Moustakim¹, Suet Ling Felce², Nancy Zaarour³

¹Nuffield Department of Medicine, Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom; Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, United Kingdom; Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom.

Methods in Enzymology

|November 5, 2018

Summary

Chemical probes are vital tools for understanding disease biology by precisely targeting proteins. Robust characterization ensures their effective use in discovering new disease-target links.

Keywords:

Cellular assays Chemical probes Epigenetics Patient-derived cellular assays Target engagement assays Target identification

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Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries

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Published on: January 22, 2019

Area of Science:

Chemical Biology
Molecular Pharmacology
Drug Discovery

Background:

Chemical probes are potent, selective small molecules targeting specific proteins.
Effective probes engage targets intracellularly and require inactive controls for validation.
Probe development and characterization are critical for their biological utility.

Purpose of the Study:

To outline the essential properties of chemical probes.
To review techniques for assessing intracellular target engagement.
To explore the translation of target engagement to disease-relevant phenotypic assays.

Main Methods:

Summarizing seminal and emerging techniques for target engagement assays.
Reviewing the translation of assays to patient-derived cells and tissues.
Presenting case studies of epigenetic chemical probe discovery and application.

Main Results:

Demonstrated utility of chemical probes in interrogating target relevance in disease models.
Presented examples of epigenetic probes revealing novel disease associations.
Highlighted the use of chemical probe sets for elucidating new target-disease connections.

Conclusions:

Well-characterized chemical probes are essential for biological target validation.
Chemical probes facilitate the discovery of novel therapeutic targets and disease mechanisms.
Chemogenomic libraries offer a powerful approach for future target-disease link discovery.