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A device used to measure the heat transfer between system and surroundings at constant volume.

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  • What are Compound Microscopes?

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Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Electromotive Series

The relative order of tendencies for elements and their simple ions to act as oxidizing or reducing agents, also called the activity series.

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

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American Chemistry Council News and Media - Provides chemistry business and industry news, updated issue briefs, fact sheets, press releases, media contacts and other resources.
About Chemistry - News articles, periodic tables, educational resources, newsletters, and annotated links.
General Chemistry Online - Rich resource for students and teachers of introductory chemistry. Includes interactive course guides and tutorials, an exam survival guide, reference tables, self-grading quizzes and exams, a searchable glossary, a question and answer board, answers to over 300 frequently asked questions, and a chemical trivia quiz.
Chem4Kids - Learn about chemistry including matter, atoms, and reactions. Includes online quizzes.
Chemistry & Environmental Dictionary - Contains definitions for many chemistry, environmental and other related technical terms and acronyms.
EDF Chemical Scoreboard - Toxic Release Inventory data for the US. Sources and amounts of toxic chemicals released to air and water. Also has information on health effects and other topics.
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Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.