Monday, December 3, 2007
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17 comments:
Why do elements need energy to create an ionic or covalent bond, or to react when combined?
How do you know whether to draw an ion or atom with both bohr and lewis dot diagrams?
Atoms want to bond to create a 'stable' atom. This is done by gaining or losing electrons, Ionic bonding. Or by the sharing or electrons, Covalent bonding.
In Ionic bonding, the atoms lose or gain electrons to form charged particles, which are called ions. Atoms which lose electrons have and positive charge and atoms that gain electrons form negatively charged ions. In ionic bonding, oppositely charged ions are strongly held together by electrostatic forces. Ionic compounds are giant structures of ions. These 'giant structures' have high melting and boiling points because of their large amounts of strong bonds which overcome between the ions.
In covalent bonding the atoms achive a stable structure by shairing pairs of electrons in their outer shells. There are many covalent compounds which are simple molecules, such as water (H2O). A shared pair of electrons is an example of covalent bonding. One electron of the pair is from one atom and other other from another atom. Simple molecular compounds (most covalent bonds) have low melting and boilind points because the forces between the two molecules are weak, even though the covalent bonds within the molecules are strong.
In order for anything to bond there must be a type of energy in the bonding process. One example of an energy is heat, such as a fire.
One example of a bond is methane and oxygen:
CH4 + O2 --heat--> CO2 + H2O
Methane+Oxygen CarbonDioxide+Water
...not sure if this helped but it's all the information I could find...
Hey Benji, good question. I will ask specifically for the diagram of the atom or the ion. The ion will have a full outer shell and an associated charge. I will also specify whether I want a Lewis Dot or a Bohr diagram.
Great answer Ashley, very comprehensive. I'm impressed! I just want to add a little bit to your answer.
To break or create bonds between atoms, energy is released (exothermic) or required (endothermic). For example, the stronger the attraction the more energy is needed to break it. The weaker the attraction the less energy is needed. Making bonds is the opposite, when a bond occurs energy is given off.
Hope this helps... anybody want to add more?
if there are two number charges in an element in the ionic table of elements, which number would be listed when that certain charge was required in a compound.
That woulddependon what elements are bonding together. For example copper has either a charge of +1 or +2. If you are bonding it with an element which has a charge of +2, like Beryllium (Be2+). Copper would have the charge of +2 because all elements want to be equal. If copper was tryingto bond with an element which had a charge of +1... copper would then have a charge of +1. Another way you can tell is when the elements are written out and you have to write their formulas. If the formula is supposed to have copper with a charge of +@ it will say: copper(II).
I hope this makes sense...
Wow Ashley i think that was a really good answer for aaron. i have a question for you to answer for me or a question for anybody to answer. how do you know when to use the roman numerals for the formula? and when do you use it? i think most people are having difficulties with using roman numerals in a formula.
hey mr woodhall
wich polyatomic compounds do we have to memerize for the test???also how do we know which roman numeral to use becuse like sopper has +1 or +2 wich one do we no to use in wrting out the name
how do we know so much about atoms like how can we see then it they are so tiny?
hey mr. woodhall,
quick question. in class today where we were doing the notes for that assignment on naming compounds what was the rule if it was covalent?
amal to answer you question you only use roman numerals to name an ion when you see that the ion is split on the periodic table anybody want to add?
i was wondering when are we having a test? and what will be in the test?
Amal, you use the roman numerals for a formula when you name Binary Ionic compunds. An example of this would be when you an element, such as copper (Cu), has two ionic charges. In this case the two charges would be +1 and +2. First you would have to determine which charge to use. You do this by looking at the second element. For this example I will use oxide (oxygen). Oxide has a ionic charge of -2. Since compounds want to be balanced we would use the charge of +2 for copper (Cu). Now this is where the roman numerals come in... Since we are using the ionic charge of +2 for copper, we would write:
Copper (II) Oxide
We put the number two in the brackets because it shows that we used copper with it's ionic charge of +2. Then we add the name of the second element with the suffix 'ide' at the end.
Hopefully this helps you Amal...
that does help me just a bit but!!!!!!!! what is binary ionic compounds??????
what i meant by binary ionic compounds was a compound which only has two different elements.
I finally get balancing compounds.
i.e MgO + O2 arrow Mg02
Yeah!!!
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