WHAT IS CHEMISTRY?

THE SCIENCE OF MATTER AND ITS INTERACTIONS

IN A CHEMICAL REACTION, WHAT DO YOU CALL THE SUBSTANCES THAT YOU START WITH? THAT YOU END UP WITH?

THE REACTANTS THE PRODUCTS

HOW DOES THE LAW OF CONSERVATION OF MASS APPLY TO A CHEMICAL REACTION?

IN A CHEMICAL REACTION, MATTER IS NEITHER CREATED OR DESTROYED. THE ATOMS ARE SIMPLY REARRANGED.

BALANCE EACH EQUATION, AND IDENTIFY ITS TYPE: a.Hf + N 2  Hf 3 N 4 b.Mg + H 2 SO 4  MgSO 4 + H 2 c.C 2 H 6 + O 2  CO 2 + H 2 O d.Pb(NO 3 ) 2 + NaI  PbI 2 + NaNO 3 e.Fe + O 2  Fe 2 O 3

BALANCE EACH EQUATION, AND IDENTIFY ITS TYPE: a.3Hf + 2N 2  Hf 3 N 4 SYNTHESIS b.Mg + H 2 SO 4  MgSO 4 + 2H 2 SINGLE DISPLACEMENT c.2C 2 H 6 + 7O 2  4CO 2 + 6H 2 O COMBUSTION d.Pb(NO 3 ) 2 + 2NaI  PbI 2 + 2NaNO 3 DOUBLE DISPL. e.4Fe + 3O 2  2Fe 2 O 3 SYNTHESIS

WHY DOES WATER HAVE SUCH UNUSUAL PROPERTIES FOR A SUBSTANCE OF ITS MOLECULAR MASS?

IT IS A POLAR COMPOUND

LIST 3 UNUSUAL PROPERTIES OF WATER.

1)IT HAS A HIGH BOILING AND MELTING POINT 2)IT HAS A HIGH HEAR OF FUSION AND HEAT OF VAPORIZATION 3)THE SOLID IS LESS DENSE THAN THE LIQUID 4)IT HAS A HIGH SURFACE TENSIION 5)IT IS A GOOD SOLVENT FOR IONIC AND POLAR COMPOUNDS

WHAT IS A MOLE?

6.023 X 10 23

WHAT DOES ONE MOLE WEIGH?

FOR ATOMS, THE ATOMIC MASS IN GRAMS FOR COMPOUNDS, THE FORMULA MASS IN GRAMS