SINGLE REPLACEMENTS: Use the provided circles with the color code below to created balanced
chemical equations for the following reactions. Glue the circles in place and write in the coefficients.
Then calculate the ratios for atoms and masses.
Carbon
Black
Oxygen
Red
K
Hydrogen
White
Calcium
Orange
+
Zinc
Gray
Potassium
Purple

HOH
Potassium atoms to replaced hydrogen atoms ratio:
Ca
+
+
;
+
HCl 
Zinc atoms to replaced hydrogen atoms ratio:
Mg +
AgNO3

+
Silver
Pink
H2
H2
+
Ca(OH) 2
+
MgCl2
; Magnesium mass to gas hydrogen mass ratio:
Ag +
Chlorine
Brown
KOH
H2
+
; Zinc mass to gas hydrogen mass ratio:
Magnesium atoms to replaced silver atoms ratio:
Copper
green
Potassium mass to hydrogen gas mass ratio:

H2SO4
Sulfur
Yellow
; Calcium mass to hydrogen gas mass ratio:
Magnesium atoms to replaced hydrogen atoms ratio:
Zn
Magnesium
Light blue
H2

HOH
Calcium atoms to replaced hydrogen atoms ratio:
Mg
Nitrogen
Dark Blue
Mg (NO3)2
Magnesium mass to silver mass ratio:
ZnSO4
EXAMPLE OF A PHYSICAL CHANGE: Note that the atoms are not rearranged into new
combinations. This is simply a phase change from a solid to a gas.

Ice
Water Vapor
WHAT IS A MOLE? Just like a dozen eggs is equal to twelve eggs, a
mole of atoms is equal to 6.022 x 10 23 atoms.
WHY THIS HUGE NUMBER? Two reasons: First, since atoms are very
small we need a huge number of these atoms to be able to see the
substance. Second, the specific number is for convenience. It relates
to the periodic table, where the mass of one atom of carbon, for
example, is 12 atomic mass units (amu) and the mass of one mole of
carbon is 12 grams.
WHAT IS MOLAR MASS? It is the mass of one mole of a substance.
For hydrogen gas (
), for example, it is 2 x 1.008 = 2.016 grams.
Water (
) has 2 H and 1 O so its molar is 2 x 1.008 + 1 x 16.00 =
18.02 grams.
TOMORROW YOU WILL HAVE A GROUP COMPETITION TO SEE WHO
CAN CONVERT ATOMS, MOLES AND GRAMS. GOOD LUCK!!!!!!