Chemical Reactions Word Search

A vocabulary sheet with its key: kinds of reaction, parts of an equation and signs of a chemical change.

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0 of 16 words found

RRLOPCOMBUSTION

TTUKROALSTDCIHH

FCCOOLUSXYIELDC

CAIXDLIOLESDWII

OAAIUIPPUNPSEBG

EVADCSROEILNNYV

FIEATIRHRWAIZWI

FPNTROGMIRCIYIO

IJTIENDOTHERMIC

CRHODNBLOSMSEOC

INANOSREAGENTIY

EOLEXCMAAFNNBTO

NRPTMREDUCTIONJ

TSYNBSYNTHESISE

EMMEXOTHERMICII

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SynthesisSYNTHESIS
CombustionCOMBUSTION
DisplacementDISPLACEMENT
RedoxREDOX
OxidationOXIDATION
ReductionREDUCTION
ProductPRODUCT
CoefficientCOEFFICIENT
YieldYIELD
ReagentREAGENT
MoleMOLE
ExothermicEXOTHERMIC
EndothermicENDOTHERMIC
EnzymeENZYME
EnthalpyENTHALPY
CollisionCOLLISION

16 of 24 words from the Chemical Reactions Key Terms list.

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Answer key: Chemical Reactions Word Search

RRLOPCOMBUSTION

TTUKROALSTDCIHH

FCCOOLUSXYIELDC

CAIXDLIOLESDWII

OAAIUIPPUNPSEBG

EVADCSROEILNNYV

FIEATIRHRWAIZWI

FPNTROGMIRCIYIO

IJTIENDOTHERMIC

CRHODNBLOSMSEOC

INANOSREAGENTIY

EOLEXCMAAFNNBTO

NRPTMREDUCTIONJ

TSYNBSYNTHESISE

EMMEXOTHERMICII

SYNTHESIS, COMBUSTION, DISPLACEMENT, REDOX, OXIDATION, REDUCTION, PRODUCT, COEFFICIENT, YIELD, REAGENT, MOLE, EXOTHERMIC, ENDOTHERMIC, ENZYME, ENTHALPY, COLLISION

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All 102 words

Types of Chemical Reactions 27

Addition An organic reaction in which two or more molecules combine to form a larger one.
Combination Another name for synthesis: two or more reactants form a single compound.
Combustion A high-temperature reaction between a fuel and an oxidant, usually oxygen from the air.
Condensation A reaction in which two molecules combine into one, usually losing a small molecule.
Cracking The breaking of long-chain hydrocarbons into simpler molecules.
Decomposition The type in which one complex substance splits into simpler parts.
Dehydration A reaction that involves the loss of water from the reacting molecule.
Displacement With "single" or "double", a type in which elements or ions trade places.
Electrolysis A technique that uses direct electric current to drive a reaction that is not spontaneous.
Elimination An organic reaction in which two substituents are removed from a molecule.
Fermentation A type of metabolism without oxygen in which sugars are broken down.
Hydrogenation A reaction between molecular hydrogen and another compound, usually with a catalyst.
Hydrolysis Any reaction in which a molecule of water breaks one or more chemical bonds.
Isomerization The process in which a molecule is transformed into another with a different structure.

Show all 102 words (88 more)

Types of Chemical Reactions, continued

Metathesis With "salt", another name for a double displacement reaction.
Neutralization The reaction in which an acid and a base react with an equivalent quantity of each other.
Oxidation The loss of electrons by an atom or ion in a reaction.
Photolysis A reaction in which molecules of a compound are broken down by absorbing light.
Polymerization The reacting of monomer molecules together to form chains or networks.
Precipitation The settling of a solid material out of a liquid solution.
Pyrolysis From the Greek for fire and separation: breaking down by heat with no oxygen present.
Redox A type of reaction that changes the reactants' oxidation states.
Reduction Gaining electrons, or a drop in oxidation state.
Replacement With "single" or "double", another name for a reaction in which one part swaps for another.
Saponification From the Latin for soap: the cleaving of esters by the action of an alkali in water.
Substitution A reaction in which one functional group in a compound is replaced by another.
Synthesis The type in which simple substances, two or more, join into a more complex one.

Chemical Equations 24

Aqueous Describes a solution in which the solvent is water; shown as (aq).
Arrow The symbol that points towards the products and is read as the word "yields".
Balance To give both sides the same number of atoms of each kind.
Coefficient A number next to a formula; suitable values of these balance both sides.
Conservation With "of mass", the law that mass can neither be created nor destroyed.
Equation The symbolic way to write a chemical reaction, in symbols and formulas.
Equilibrium The state in which the forward and reverse reactions proceed at the same rate.
Excess Describes a reagent present in more than the quantity the limiting one can react with.
Intermediate An entity that forms in one step of a reaction and is consumed in a later step.
Limiting With "reagent", the reactant that is totally consumed when the reaction is completed.
Mass In total, it is equal for the reactants and the products.
Mechanism The step by step sequence of elementary reactions by which the overall reaction occurs.
Mole The SI base unit for amount of substance.
Plus sign The symbol written between the entities on each side.
Product A substance formed by a chemical reaction; it is written on the right-hand side.
Ratio A compound contains its elements in a fixed one, by mass.
Reactant A substance that is consumed in a chemical reaction; it is written on the left-hand side.
Reaction A process that transforms one set of chemical substances into another.
Reagent A substance added to a system to cause a chemical reaction, or to test if one occurs.
Rearrange What atoms do in a chemical reaction as new products are generated.
Reversible Describes a reaction that runs from reactants to products and back at the same time.
Stoichiometry The relationships between the quantities of reactants and products.
Substance A form of matter with constant chemical composition and characteristic properties.
Yield The amount of product obtained in a chemical reaction.

Energy and Reaction Rate 25

Absorb What an endothermic process does with heat from its surroundings.
Activation With "energy", the minimum amount reactants must have for a reaction to occur.
Agent With "oxidizing" or "reducing", a substance that accepts or donates electrons.
Catalyst An added substance that increases the rate of a reaction and is not consumed by it.
Collision With "theory", the principle that reactant particles must hit each other to react.
Concentration Increasing it for a reactant brings about more collisions.
Endothermic Describes a process that absorbs heat from its surroundings.
Energy A chemical reaction is accompanied by a change in this.
Enthalpy A quantity whose change, at constant pressure, equals the energy exchanged by heat.
Enzyme A biological catalyst, usually a protein.
Exothermic Describes a reaction that usually releases stored energy as heat.
Fuel The substance that reacts with an oxidant in combustion.
Heat The form in which exothermic reactions usually give off stored energy.
Inhibitor A substance that decreases the rate of, or prevents, a chemical reaction.
Kinetics The branch of chemistry concerned with the rates of chemical reactions.
Oxidant The substance that gains electrons in a redox reaction.
Pressure Increasing it makes collisions more frequent between molecules.
Rate With "reaction", how fast a chemical reaction goes.
Reductant The substance that donates electrons in a redox reaction.
Release What an exothermic reaction usually does with stored energy.
Spontaneous Describes a process that occurs without any external input to the system.
Stirring Mixing: one of the listed things that change the reaction rate.
Surface area A larger one, for a solid reactant, leads to a higher reaction rate.
Temperature When it rises, reaction rates typically increase, because more thermal energy is available.
Transition With "state", the point of highest potential energy along the path of a reaction.

Signs and Everyday Reactions 26

Battery A device powered by redox reactions.
Bleaching The removing of color from fabric, fiber or food by a chemical product.
Browning The color change of toast or seared food, caused by a chemical reaction in cooking.
Burning Another word for combustion.
Caramelization The browning of sugar, used in cooking for its flavor and brown color.
Color change An indication of a chemical change, as when iron turns reddish-brown.
Effervescence The escape of gas from a solution in water, and the foaming or fizzing that results.
Explosion A rapid expansion in volume with an extreme outward release of energy.
Fire What combustion often, but not always, results in.
Fizzing What a liquid does as gas escapes from it.
Flash A sudden burst of light, as from a chemiluminescent reaction.
Gas Its production is one indication by which a chemical change may be recognized.
Glow A chemiluminescent reaction gives off a flash of light or this.
Hand warmer An everyday item that uses the oxidation of iron to give off heat.
Irreversible Describes many chemical changes, which cannot simply be undone.
Light What a chemiluminescent reaction emits.
Luminescence The emission of light, as by a reaction that gives a flash or a glow.
New substance What a chemical change forms and a physical change does not.
Odor A smell: one indication by which a chemical change may be recognized.
Photosynthesis The process by which plants convert light energy; it proceeds through redox chemistry.
Precipitate The solid that forms and settles out of a liquid solution.
Respiration With "cellular", the oxidizing of biological fuels to drive the production of ATP.
Rusting The slow reaction of iron with oxygen, helped by water, that forms a reddish-brown oxide.
Smoke The mixture of products, often gases, that combustion gives off.
Soap The long-chain salt that saponification produces.
Tarnish A thin layer of corrosion that forms over copper, brass and similar metals.

How this list was compiled: Own work: the word list and every clue were written for this page. The facts in the clues were checked on 2026-10-08 against English Wikipedia (CC BY-SA 4.0), among them the articles on the chemical reaction (https://en.wikipedia.org/wiki/Chemical_reaction), the chemical equation (https://en.wikipedia.org/wiki/Chemical_equation), reaction rate (https://en.wikipedia.org/wiki/Reaction_rate), catalysis (https://en.wikipedia.org/wiki/Catalysis), redox (https://en.wikipedia.org/wiki/Redox), combustion (https://en.wikipedia.org/wiki/Combustion), the exothermic reaction (https://en.wikipedia.org/wiki/Exothermic_reaction) and physical change (https://en.wikipedia.org/wiki/Physical_change), with spellings checked in Wiktionary (https://en.wiktionary.org/). Licence: own work

How it works

This chemical reactions word search draws 16 of 24 key terms, such as Reactant, Product, Catalyst, Synthesis, Combustion, Precipitate, Exothermic and Endothermic. For the wider subject, atoms to acids, print the chemistry word search.

Read the full guide

A chemical reaction word search by type

Types of Chemical Reactions, under Start from a list, has 27 words, among them Synthesis, Decomposition, Displacement, Combustion, Redox, Neutralization and Hydrolysis, and Saponification, the reaction that produces soap.

Equations, energy and signs

Chemical Equations has 24 words, among them Reactant, Arrow, Product, Coefficient and Yield. Energy and Reaction Rate has 25, among them Catalyst, Inhibitor and Activation. Signs and Everyday Reactions has 26, from Odor, Gas and Color change to Rusting, Browning and Hand warmer.

Color change, Surface area, Hand warmer, Plus sign and New substance hide closed up: COLORCHANGE.

Questions and answers

What are the types of chemical reactions?

Four basic types: synthesis, where simple substances combine; decomposition, where a complex substance breaks down; single displacement, where one element replaces another in a compound; and double displacement, where the ions of two compounds switch places.

What are the signs of a chemical reaction?

Look for an odor, a change of color or a gas being given off; many chemical changes also cannot simply be undone. Each of those signs can also come from a physical change, so none is proof alone.

What is the difference between exothermic and endothermic reactions?

An exothermic reaction usually releases stored energy as heat; combustion is one. An endothermic process absorbs heat from its surroundings; thermal decomposition is one.

What does a catalyst do in a chemical reaction?

It increases the rate of the reaction by providing a pathway with a lower activation energy, and it is not consumed. An enzyme is a biological catalyst. An inhibitor does the opposite.

Does the chemical reactions word search print with a key?

Yes, on two pages of Letter or A4: the puzzle, then the same grid with every word ringed. Tick Show clues, not words and Yield becomes "The amount of product obtained in a chemical reaction."

All 102 words

Types of Chemical Reactions 27

Types of Chemical Reactions, continued

Chemical Equations 24

Energy and Reaction Rate 25

Signs and Everyday Reactions 26

How it works

A chemical reaction word search by type

Equations, energy and signs

Questions and answers

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