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Form IV - Chem

Form IV - Honors Chem - Unit 3

QuestionAnswer
what are the 2 big questions that chemists ask? 1. what is this stuff? 2. what happens when I mix it together?
how many valence electrons do all atoms have? are there any exceptions to this? if so, what are they? 8 - the octet rule / yes / hydrogen and helium (they only want 2 valence electrons)
what is the driving force making an atom want to bond? it is trying to achieve / get to 8 valence electrons
in an ionic bond, one atom ___________ electrons to the other atom transfers
in a covalent bond, the two atoms __________ electrons share
an ionic bond forms between a _________ and a ____________. This results in a new substance called a ___________. metal and a non-metal (the metal gives the electron - the non-metal receives it) // compound
compounds: an ionic bond forms a ______________ a covalent bond forms a _____________ compound // molecule
a covalent bond is made up of 2 _____________ that are sharing electrons non-metals
do substances that bond ionically and covalently have the same properties? no
List some properties of substances formed by ionic bonds? solid / crystals / break along the edges / high melting points
List some properties of substances formed by covalent bonds? gases or liquids / can be formed with single bonds (sharing 1 electron), double bonds (sharing 2 electrons), triple bonds (sharing 3 electrons), etc.
when writing the chemical formula for a metal and a non-metal: 1. check that you have a _________ and a ________________ 2. Determine the ____________ of each ion 3. Combine the ions such that the compound is ________ 1. metal and a non-metal 2. charge 3. neutral
Created by: paulesumner
 

 



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