Chemistry Chemical Reactions

Question 1

Indicator of chemical reaction

Answer 1

-Color change
-Formation of gas
-Formation of precipitate (solid)
-Energy transfer (endothermic/exothermic)

Question 2

Synthesis

Answer 2

Reactants yield single product
A+B –> AB

Question 3

Decomposition

Answer 3

Single reactant yields multiple products
AB–> A+B

Question 4

Single Replacement

Answer 4

Lone element plus compound yields new lone element and compound. (If lone element is metal, it replaces the metal. If it is a nonmetal, it replaces the nonmetal)
A+BC–>B+AC

Question 5

Double Replacement

Answer 5

A compound plus a compound yeilds a new compound plus a new compound
AB+CD–>AD+BC

Question 6

Acid Base Neutralization

Answer 6

An acid plus a base yields water and a salt (reactants are always H__+___OH) (Works like single replacement)

Question 7

Combustion

Answer 7

Some combination of Carbon, Hydrogen, and Oxygen result in the formation of CO2 and Water
(reactants are always CH+O or CHO+O)

Question 8

Carbonate Decomposition

Answer 8

A metal carbonate compound yield metal oxide and carbonate
ACO3–>AO+CO2

Question 9

Hydroxide Decomposition

Answer 9

A metal hydroxide compound yield metal oxide and water
AOH–>AO+H2O

Question 10

Chlorate Decomposition

Answer 10

A metal chlorate compound yield a metal chlorine compound and O2
ACLO3–>ACl+O2

Question 11

When do single replacements take place?

Answer 11

When the lone metal is higher than the metal it is replacing on the activity series, or the nonmetal is higher on the periodic table than the nonmetal it is replacing.

Question 12

When do double replacements take place?

Answer 12

When at least one of the products is insoluble