–Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

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Transcript of –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Page 1: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.
Page 2: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

–Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken

Page 3: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

–Chemical reactions involve changes in matter, the making of new materials with new properties, and energy changes.

                                       

Page 4: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

–Symbols represent elements, formulas describe compounds, chemical equations describe a chemical reaction

Page 5: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Items to the LEFT of the arrow in a chemical equation are called

REACTANTS.

2Na + Cl2 2NaCl

Page 6: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Items to the right of the

arrow are called

PRODUCTS.

Ex: 2Na + Cl2 2NaCl

Page 7: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Important NOTE:

No matter how many reactants and products are involved, all atoms present at the start of a reaction are present at the end.

Page 8: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

THE TOTAL MASS OF THE REACTANTS MUST EQUAL THE TOTAL MASS OF PRODUCTS.

MATTER IS NEVER CREATED OR DESTROYED.

Page 9: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

A number that tells how many molecules of a substance are involved in a

chemical reaction.

A coefficient of 1 is not written.

Page 10: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Subscripts• A subscript indicates how many

atoms of an element are in a compound

Ex. H2SO4

H= 2 S = 1 O = 4

Page 11: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Subscripts vs. Subscripts vs. CoefficientsCoefficients

Page 12: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

+ -- used to separate two reactants or products.

(yields) Separates reactants and products.

Page 13: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Reactions that release heat.

Page 14: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Reactions that absorb heat.

Page 15: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

A substance that speeds up chemical reactions.

Page 16: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

A substance that slows down a chemical reaction.

Page 17: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.
Page 18: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Reactions that have hydrocarbons (CH4) and oxygen as reactants, and carbon dioxide and water as products.

Page 19: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Example:

C3H8 + 5O2 3CO2 + 4H2O

Page 20: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.
Page 21: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2Na + Cl2 2NaCl

Na2O + CO2 Na2CO3

Page 22: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Starts with one reactant and ends with 2 or more products.

Page 23: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2KClO3 2KCl + 3O2

2NaCl 2Na + Cl2

Page 24: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

One compound and a free element that recombine to yield a new compound and new free element.

Page 25: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Fe + CuSO4 Cu + FeSO4

2Na + 2HCl H2 + 2NaCl

Page 26: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

Starts with 2 compounds as reactants. These recombine to form 2 new compounds as products.

+ +

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NaCl + AgNO3 NaNO3 + AgCl

KOH + HNO3 HOH + KNO3

Page 28: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.
Page 29: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

C + O2 ----- CO2

Page 30: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2NaCl 2Na + Cl2

Page 31: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

FeCl2 + K2S FeS + 2KCl

Page 32: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

C2H4 + 3O2 2CO2 + 2H2O

Page 33: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2AlCl3 + 3Na2CO3 Al2(CO3)3 + 6NaCl

Page 34: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

CS2 + 3O2 CO2 + 2SO2

Page 35: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

3Fe + 4H2O Fe3O4 + 4H2

Page 36: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2AlCl3 2Al + 3Cl2

Page 37: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2Na + H2SO4 ---> Na2SO4 + H2

Page 38: –Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken.

2Cr + 3O2 2CrO3


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