Flashcards
Chapter 2
Cards in this deck (9)
- 1AtomSmallest particles of an element, still retains chemical identity of the element;made up of negatively charged electrons, positively charged protons, and uncharged neutrons
- 2elementsubstance that cannot be separated into simpler substances by a chemical change; simplest type of pure substance. An element can have 2 or more isotopes.
- 3moleculeneutral group of atoms chemically united in COVALENT BONDS
- 4compoundsubstance that contains two or more elements chemically combined (ionic/covalent bonds) in a fixed proportion ex:water, H2O
- 5Mixtureblend of two or more pure substances that are not chemically combined , proportion vary, ex: different amount of salt and sugar in water
- 6Nucleuscentral core of an element, contains protons and neutrons
- 7Atomic MassMagnesium - 3 isotopes (with mass 24,25,26)-->periodic table mass 24.305 amu
- 8types of atomic combinations1)compounds (atoms of DIFFERENT elements) (ionic NaCl, covalent bonds H2O) : proportions never vary. 2) Molecule- two or more atoms from SAME or DIFFERENT elements combined.
- 9Difference between a molecule and a compoundmolecule=2 or more atoms joined together in covalent bonds
2 or more atoms of different elemens joined together
Information
- Description
- 11th grade Chemistry Flashcards on Chapter 2, created by Nam Bui on 31/08/2016.
- Created by
- Nam Bui · Aug 2016
- Updated
- Sep 13, 2016
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