Flashcards
Atoms and Molecules flashcards
Cards in this deck (15)
- 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
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- high school chemistry Flashcards on Atoms and Molecules flashcards, created by Aryahi Sinha on 27/07/2021.
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- Aryahi Sinha
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