Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH NaCl + H 2 O And label the...

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Counting Atoms!! Oct 5 th 2012

Transcript of Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH NaCl + H 2 O And label the...

Page 1: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

Counting Atoms!!

Oct 5th 2012

Page 2: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

Reactants and Formulas

• Write:HCl + NaOH NaCl + H2O

And label the reactants and the products

Page 3: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

• The law of Conservation of Mass-• the mass of substances in a closed system will

remain constant, no matter what processes are acting inside the system.

Page 4: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

We know what is a formula

• We have seen that a chemical formula is…• A number of atoms that make up ONE compound

• Ex. Mg2O• So this example will have what number of elements?• Mg:2• O:1• Therefore….2 Mg and 1 Oxygen is the chemical

formula for making the compound= Mg2O

Page 5: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

But wait….there is more!

• Vocab:• Coefficients- A number in front of a chemical

formula(compound) used to tell the number of compounds.

Ex. (The #2 in 2Pb3O4)

Page 6: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.
Page 7: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

Subscripts

• Vocab:• Subscripts:A SMALL number written after an element in a

chemical formula telling how many of that element is in the formula.

Ex. FeS2 this two is a subscript

Page 8: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

Write in IAN please

Page 9: Counting Atoms!! Oct 5 th 2012. Reactants and Formulas Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products.

Alright, how many total atoms of each

• Mg2P2O7 =

• AuCl3 =

• C4H12O2 =

• 2C3H4

• CaMgSi3O8 =

• CaHPO3 + 3H2O =

• 3CuCl2 =

• Pb3O4 =