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HOW DO I WRITE THE ELECTRON DOT FORMULA FOR H2O

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Http://www.middleschoolchemistry.com/img/content/multimedia/chapter_4/lesson_6/covalent_bond_water_2.jpg

Posted on Apr 20, 2014

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I replaced the h2o sensor on my 2004 lexus gx470 now it idles to low.I disconnected the battery neg before I replaced it.


If its anything like a Ford, changing a sensor throws the electronics into a frenzy. Try completely disconnecting the battery and leaving the car for an hour to completely wipe or reset the electronic programs. Reconnect the battery and try the car again. The electronics should have reset to the factory standard settings and will communicate with the new sensor.

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A (n)_________tells what elements make up a compound and the ratios of the atoms of those elements.


It's called a Formula or Formula of a compound.
H2O, NaCl, H2SO4, I believe that's what you're asking about.
H2O is 2 parts Hydrogen to 1 part Oxygen. (Water)
NaCl is 1 part Sodium to 1 part Chlorine (Salt)
H2SO4 is 2 parts hydrogen, 1 part Sulfur, 4 parts Oxygen (Sulfuric acid)

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The equation for photosynthesis is?


In oxygenic photosynthesis water is the electron donor and, since its hydrolysis releases oxygen, the equation for this process is: 2n CO2 + 4n H2O + photons ? 2(CH2O)n + 2n O2 + 2n H2O. carbon dioxide + water + light energy ? carbohydrate + oxygen + water.

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Casio te-100 configuration


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Write down the equation for the formation of the complex trans-K[Cr(C2O4)2(H2O)2.3H2O from the reactants K2Cr2O7 and H2C2O4.2H2O.


limiting reactant:
The limiting reagent, or also called the "limiting reactant", is the chemical that determines how far the reaction will go before the chemical in question gets used up, causing the reaction to stop. The chemical of which there are fewer moles than the proportion requires is the limiting reagent.

Limiting reagent formula
There is a much simpler formula which can be used. However, you must first calculate the moles of both of the reagents in the reaction. Once the number of moles have been figured out, just simply fill in this equation (reagent 1 being the first reactant and 2 being the second):

When the answer to the formula is less than zero, reagent 1 is the excess reagent. When the answer is larger than zero, reagent 1 is the limiting reagent. The number shows how much in excess one reagent is from another. If the answer for the formula is zero, both reagents are perfectly balanced. The unit of an answer is in moles.

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What is the electron dot diagram for nitrogen


The electron-dot structure (also known as the "Lewis dot structure") for N is shown below:dubblea_6.jpg The red dots represent electrons that comprise the atom's 5 valence electrons. Recall that the valence (outermost) electrons are those that are involved in chemical reactions of bonding. The rule you should apply to drawing this electron dot structure is to first draw (or imagine) a rectangle around the atom's symbol, letting the rectangle represent the atom's core electrons (not shown), those within the atom's inner (s) shell. Then place one electron on each side. That leaves the remaining electron to be placed on one of the already occupied sides to give the electron pair.

It doesn't matter what side you place this 5th electron, because the final result is the pattern shown above, 3 single dots and one pair of dots, which neatly reveals the bonding power* of N (3) - and the existence of the one electron pair, which predicts special types of reactivity you will probably appreciate in more advanced topics of this element's behavior.

*The single electrons are more reactive than the electron pair, and will readily form bonds with other atoms, such as H. This allows you to predict that N and H atoms will combine to form NH3.

How do you know there are 5 valence electrons? For the answer, refer to the following partial image of the Periodic Table of the Elements I drew using Word and SnagIT software:
dubblea.gif
Notice the number-letter labels above each column ("group") of elements, for example "5A." The letter A indicates the groups of "representative" elements, the most common elements studied in general chemistry courses. The numbers before the "A" represents the number of valence electrons surrounding each element's atoms. For example, hydrogen has one valence electron, nitrogen has 5 valence electrons, and oxygen has 6 valence electrons.

Using the rules described above for drawing electron-dot structures, how many single dots and double dots should be drawn around H? Around O? Can you predict the bonding power of each of these atoms? What molecular compounds do you predict would be formed from the reaction of H and H? What molecular compound do you predict would form between combining H atoms and O?

Hints:
Reactions tend to occur that cause the single electrons (dots) to pair up. This occurs because paired electrons are much more stable than single electrons. A strong driving force for a reaction is the going from a less stable state to a more stable state. Hydrogen atoms from H2 molecules (diatomic molecules). H and O atoms combine to form dihydrogen oxide, also known as water!

Summary:
  • A very simple set of rules allows you to predict the electron dot structures of the representative elements.
  • The electron dot structures are very useful, because they can allow you to predict the bonding power of each representative element.
  • They are also useful in guiding your prediction of the compositions of molecules that can form during reactions between their atoms (that is, how many of each element in the molecule).
  • In more advanced topics you will also be able to use electron-dot structures to predict the shapes (or geometry) of molecules, including bond angles!
  • So, learning the skill of drawing electron-dot structures is very important to mastering chemistry!

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Nov 04, 2010 | Scientific Explorer My First Chemistry Kit

3 Answers

How do i insert a formula in a column to add each number & give a total at the bottom?


For example, you have three numbers from A1 to A3. On row A4, type =SUM(A1:A3).

That should do it. :)

Sep 16, 2009 | Microsoft Office Excel 2007

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