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Grades 7–8 Science Vocabulary

20 essential words with definitions, examples, and quick-check quizzes.

Activation Energy
noun
The minimum amount of energy required to start a chemical reaction....
Aerobic Respiration
noun
Cellular respiration that uses oxygen to break down glucose and release energy....
Biodiversity
noun
The variety of living organisms in a particular habitat or ecosystem....
Covalent Bond
noun
A chemical bond formed when two atoms share one or more pairs of electrons....
Dna
noun
Deoxyribonucleic acid — the molecule that carries genetic information in living ...
Electromagnetic Induction
noun
The production of an electric current in a conductor by a changing magnetic fiel...
Entropy
noun
A measure of disorder or randomness in a system; the tendency of systems to move...
Ionic Bond
noun
A chemical bond formed by the electrostatic attraction between oppositely charge...
Meiosis
noun
A type of cell division that produces four daughter cells with half the chromoso...
Momentum
noun
The quantity of motion of a moving body, equal to mass times velocity....
Mutation
noun
A change in the DNA sequence of an organism that can alter traits....
Newton'S Laws
noun
Three fundamental laws of motion: inertia, force equals mass times acceleration,...
Nuclear Fission
noun
The splitting of a heavy atomic nucleus into smaller nuclei, releasing large amo...
Oxidation
noun
A chemical reaction involving the loss of electrons, often combining with oxygen...
Protein Synthesis
noun
The process by which cells make proteins based on information encoded in DNA....
Quantum
noun
The smallest discrete unit of a physical quantity, especially energy....
Speciation
noun
The evolutionary process by which populations evolve to become distinct species....
Stoichiometry
noun
The calculation of reactants and products in chemical reactions based on balance...
Tectonic Plates
noun
Large pieces of Earth's lithosphere that move and interact to shape the planet's...
Thermodynamics
noun
The branch of physics concerned with heat and its relation to energy and work....