1. Chapter 11 Chemical Reactions

2. Comparing masses doesn’t tell the ratio of substances reacting
comparing numbers of moles does
2.016 g H2 will react with 38.0 g F2 to produce g HF

3. Writing Chemical Equations
Reactants Products
-Word Equations
-Chemical Equations
-skeleton equation

4. Signs of a Chemical Change
Color change
Temperature change
Precipitate
Production of gas
odor

6. Balance a chemical equation…
with coefficients
so it obeys the Law of Conservation of Mass/Matter
-Remember what John Dalton’s atomic theory said—as reactants are converted to products, bonds are broken and new bonds are formed

7. Zn(OH)2 + H3PO4 Zn3(PO4)2 + H2O AgNO3 + H2S Ag2S + HNO3
NaCl BeF NaF BeCl2
AgNO H2S Ag2S HNO3
Zn(OH) H3PO Zn3(PO4)2 + H2O

8. Hydrogen + sulfur produces hydrogen sulfide Iron (III) chloride + calcium hydroxide produces iron (III) hydroxide + calcium chloride

9. Sodium hydroxide reacts with sulfuric acid to form sodium sulfate and water.