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Atoms and Molecules flashcards

Aryahi Sinha chemistry high school Inglés 15 fichas

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1law of conservation of mass states that?mass can neither be destroyed nor created in a chemical reaction
2what is the law of definite proportions?in a chemical substance the elements are always present in definite proportions by mass
3what is dalton's atomic theory?all matter whether is composed of small particles called atom.
4what is an atom?the building blocks of all matter are atoms
5how big are atoms?atomic radius is measured in nanometres.
1/10^9m=1nm
1m=10^9nm
6the standard reference for measuring atomic masses?carbon-12 isotope.
one atomic mass unit is exactly one twelfth the mass of one atom of carbon 12
7what are molecules?a molecule is a group of two or more atoms chemically bonded together, that is, held tightly together by attractive forces.
8what is atomicity?the number of atoms constituting a molecule
9monoatomic elementsargon and helium
10diatomic elementsoxygen, hydrogen, nitrogen and chlorine
11tetra atomic elementphosphorus
12poly-atomic elementsulphur
13what is an ion?compounds composed of metals and non-metals contain charged species known as ions. Ions can be negatively and positively charged.
14negatively charged ionanion
15positively charged ion?cation

Descripción: high school chemistry Fichas sobre Atoms and Molecules flashcards, creado por Aryahi Sinha el 27/07/2021.
Creado por: Aryahi Sinha
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