Steam and liquid water are two different forms of the same chemical (pure) substance: water.
A thermite reaction using iron(III) oxide. The sparks flying outwards are globules of molten iron trailing smoke in their wake.
Example for a dissolved solid (left)
Colors of a single chemical (Nile red) in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environment.
Antoine Lavoisier developed the theory of combustion as a chemical reaction with oxygen.
Formation of crystals in a 4.2 M ammonium sulfate solution. The solution was initially prepared at 20 °C and then stored for 2 days at 4 °C.
Native sulfur crystals. Sulfur occurs naturally as elemental sulfur, in sulfide and sulfate minerals and in hydrogen sulfide.
As seen from the equation CH4 + 2O2 -> CO2 + 2 H2O, a coefficient of 2 must be placed before the oxygen gas on the reactants side and before the water on the products side in order for, as per the law of conservation of mass, the quantity of each element does not change during the reaction
Potassium ferricyanide is a compound of potassium, iron, carbon and nitrogen; although it contains cyanide anions, it does not release them and is nontoxic.
An example of organic reaction: oxidation of ketones to esters with a peroxycarboxylic acid
Cranberry glass, while appearing homogeneous, is a mixture consisting of glass and gold colloidal particles of about 40nm in diameter, giving it a red color.
Isomerization of azobenzene, induced by light (hν) or heat (Δ)
Dissolution of sodium chloride in water
Chemicals in graduated cylinders and beaker.
Representation of four basic chemical reactions types: synthesis, decomposition, single replacement and double replacement.
Thermodynamic cycle for calculating solvation via sublimation
Illustration of a redox reaction
Thermodynamic cycle for calculating solvation via fusion
Sodium chloride is formed through the redox reaction of sodium metal and chlorine gas
Ferrocene – an iron atom sandwiched between two C5H5 ligands
In this Paterno–Büchi reaction, a photoexcited carbonyl group is added to an unexcited olefin, yielding an oxetane.
Schematic potential energy diagram showing the effect of a catalyst in an endothermic chemical reaction. The presence of a catalyst opens a different reaction pathway (in red) with a lower activation energy. The final result and the overall thermodynamics are the same.
Solid heterogeneous catalysts are plated on meshes in ceramic catalytic converters in order to maximize their surface area. This exhaust converter is from a Peugeot 106 S2 1100
Mechanism of electrophilic aromatic substitution
E2 elimination
Electrophilic addition of hydrogen bromide
Acid-catalyzed addition-elimination mechanism
The Cope rearrangement of 3-methyl-1,5-hexadiene
Illustration of the induced fit model of enzyme activity
Thermite reaction proceeding in railway welding. Shortly after this, the liquid iron flows into the mould around the rail gap.

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.

- Chemical reaction

In chemistry, solubility is the ability of a substance, the solute, to form a solution with another substance, the solvent.

- Solubility

Chemical substances may be combined or converted to others by means of chemical reactions.

- Chemical substance

The concept of solubility does not apply when there is an irreversible chemical reaction between the two substances, such as the reaction of calcium hydroxide with hydrochloric acid; even though one might say, informally, that one "dissolved" the other.

- Solubility

Iron(II) sulfide has its own distinct properties such as melting point and solubility, and the two elements cannot be separated using normal mechanical processes; a magnet will be unable to recover the iron, since there is no metallic iron present in the compound.

- Chemical substance

It usually takes place when the concentration of dissolved ions exceeds the solubility limit and forms an insoluble salt.

- Chemical reaction
Steam and liquid water are two different forms of the same chemical (pure) substance: water.

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