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chp 6 chem test
| Question | Answer |
|---|---|
| ionic bonding | chemical bonding that results from electrical attraction between cations and anions transfer electrons |
| Covalent bonding | results from sharing of electrons between two atoms |
| Describe ionic bonds | non-metals to metals , EN 1.7, make compunds, |
| Describe covalent bonds | non-metals and non-metals, less than 1.7 EN, molecules |
| electronegativity | measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound |
| What are the 7 diatomic elements | H2,N2,O2,F2,CL2,BR2,I2 |
| What are the expiermental diffrences on ionic bonds | form crystal lattice, string bonds, high energies, harrd and brittle, soluble in water, good conductrs, high melting and boiling point |
| what are the expiermntal diffrences in a covalent bond | bonds not as strong energies low, properties determined by bond and shape , not electric conductive, low melting and boiling point |
| bond lengths | as bond length increases the bond energy to break it decreases |
| molecule | a netural group of atoms held together by covalent bonds |
| molecular compound | a chemical compound whos simplest units are molecules |
| chemical formula | tells the amount of atoms of each kind in a chemical compound with the use of atomic symbols |
| molecular formula | shpws the type and number of atoms combined in a single molecule in a molecular compound |
| electron dot notation | an electron configuration notation in which only valence electrons of an atom of an elemnt indicates where the dots are placed |
| what 3 elements are an exception to the octect rule | H, B, Be |
| ionic compound | have positive and negative charge |
| polynomatic ion | a charged group of covalently bonded atoms |
| VSEPR theory | states that repulsion between the sets of valence level electrons surrounding an atom cause the set to be as far apart from each other |
| Linear | 2 elements, 0 lone pairs |
| TRngular-planar | 3 atoms, O lone pairs |
| Bent | 2 atoms, 1/2 lone pairs |
| tectrahedral | 4 atoms, 0 lone pairs |
| trional pyramid | 3 atoms, 1 lone pair |
| I f the lone paor is 0 | non polar .3 |
| if lone pair is 1 and up | polar 1.7 |
| polarity of a molecule | is determined by the electronegativity difference and shape |
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