Table 4.1 KI
KOH
Na,,
Na, so
Ca(NO3),
NR
Faint white
prec.*
White prec.
NR
Cu(NO )2
Brown prec.
Blue prec.
Blue prec.
NR
Ni (NOR),
NR
Light blue-green Very faint blue
prec.
prec.
NR
Zn (NO)
NR
NR
Milky white
prec.
Faint white
prec.
"Note: These reactions are very slow, so it is possible you did not see a change in the time given.
1. Write a balanced chemical equation for each double replacement reaction that occurs.
Note: Compounds with Na, K, and/or NO-are soluble.

they are made of gases.

they have a spherical shape.

they make energy through fusion.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.