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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...

Chemical Reactions

Chemical Reactions

A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...

Introduction to Chemical Reactions

Introduction to Chemical Reactions

All chemical reactions begin with a reactant, the general term for one or more substances entering the reaction. Sodium and chloride ions, for example, are the reactants in the production of table salt. One or more substances produced by a chemical reaction are called the product. Chemical reactions follow the law of conservation of mass, which means that matter cannot be created nor destroyed in a chemical reaction. The components of the reactants—the number of atoms and the...

Predicting Reaction Outcomes

Predicting Reaction Outcomes

Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...

Chemical Reactions in Aqueous Solutions

Chemical Reactions in Aqueous Solutions

Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.

Reaction Mechanisms

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:

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Related Experiment Video

Updated: Apr 5, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

Chemical Reaction Evolving on a Droplet.

Kinko Tsuji¹, Stefan C Müller²

¹†Shimadzu Europa GmbH, Albert-Hahn-Strasse 6-10, D-47269 Duisburg, Germany.

The Journal of Physical Chemistry Letters

|August 20, 2015

Summary

This study reveals that chemical reactions initiated by a pH indicator droplet impinging on an alkaline solution begin at the droplet

Keywords:

droplet heat diffusion interface nonlinear dynamics redox reaction

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Area of Science:

Fluid dynamics
Chemical kinetics
Interface science

Background:

Understanding early-stage chemical reactions is crucial for various scientific fields.
Investigating droplet-surface interactions provides insights into complex transport phenomena.

Purpose of the Study:

To investigate the initial milliseconds of a chemical reaction between a pH indicator droplet and an alkaline solution.
To analyze the spatial and temporal dynamics of the reaction front.

Main Methods:

Utilizing high-speed imaging to capture the reaction dynamics at millisecond timescales.
Observing the color change of a pH indicator upon contact with an alkaline surface.

Main Results:

The reaction initiates along the equatorial line of the droplet, not at the initial contact point.
Vertical finger-like structures emerge from the reaction front within 1.5 milliseconds.
Droplet deformation and heat diffusion are identified as key factors in the early reaction stage.

Conclusions:

The study challenges conventional expectations of reaction initiation points.
Findings contribute to understanding short-term interfacial transport and the onset of reaction front instability.