XII. Limestone

Question 1

a carbonate rock consisting mainly of calcite or aragonite

Answer 1

Limestone

Question 2

Four kinds of lime are used for agricultural purposes:

Answer 2

(1) High-calcium lime
(2) Magnesian lime
(3) Oyster-shell lime
(4) Hydrated lime

Question 3

made from burning limestone with 50-55% calcium oxide and 40-55% carbonic acid, containing small %ages of magnesia, silica, iron, and alumina. A lime derived from these raw materials yields 90 to 98% calcium oxide.

Answer 3

High-calcium lime

Question 4

used in agriculture contains 5-20% magnesia and 70 -85% calcium oxide. A bushel of magnesian lime weighs about 70 pounds; a high-calcium lime, 90-95 pounds.

Answer 4

Magnesian lime

Question 5

crushed oyster shell that has been calcined and used as agricultural lime or simply aglime

Answer 5

Oyster-shell lime

Question 6

hydrated calcium oxide, Ca(OH)2, with 24% water

Answer 6

Hydrated lime