How do you balance chemical formulas?
Answer:
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Audio , visual presentation " How to balance Equations "
A chemical equation describes what happens in a chemical reaction. The equation identifies the reactants (starting materials) and products (resulting substance), the formulas of the participants, the phases of the participants (solid, liquid, gas), and the amount of each substance. Balancing a chemical equation refers to establishing the mathematical relationship between the quantity of reactants and products. The quantities are expressed as grams or moles.
It takes practice to be able to write balanced equations. There are essentially three steps to the process:
Write the unbalanced equation.
Chemical formulas of reactants are listed on the lefthand side of the equation.
Products are listed on the righthand side of the equation.
Reactants and products are separated by putting an arrow between them to show the direction of the reaction.
Reactions at equilibrium will have arrows facing both directions.
Balance the equation.
Apply the Law of Conservation of Mass to get the same number of atoms of every element on each side of the equation. Tip: Start by balancing an element that appears in only one reactant and product.
Once one element is balanced, proceed to balance another, and another, until all elements are balanced.
Balance chemical formulas by placing coefficients in front of them. Do not add subscripts, because this will change the formulas.
Indicate the states of matter of the reactants and products.
Use (g) for gaseous substances.
Use (s) for solids.
Use (l) for liquids.
Use (aq) for species in solution in water.
Write the state of matter immediately following the formula of the substance it describes...
please explain in detail what you want explained in detail !
suppose this reaction
x AnBm + y CpDq ---> z Ar Ds +t CvBw
where x, y, z, t are the coefficients of the reactants and the products and n,m, p, q; r, s v , w are the numbers of atoms in reactants or products.
THE SUM of ALL atoms of EACH species must be the same in both sides
that means xn =zr, xm=tw, yp=tv and zs = yq
example
2 Al(OH)3 + 3H2SO4 = Al2 (SO4 )3 +6H2O
number of atoms of Al =2 (in both sides
number of atoms of O left side 2*3+4*3=18, in the left side3*4+1*6 =18
number of hydrogens left 2*3+3*2 =12 right 6*2=12
number of sulfurs 3 in the left and the right
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