1. The rocks made of limestone are chemically mainly
.
2. It can be quarried and used as a
material though it is badly
by acid
.
3. Powdered limestone can be used to
acidity in lakes and soils.
4a. When limestone is strongly heated in a kiln it forms
.
4b. Word equation for the reaction is ...
calcium carbonate ==> calcium
+ carbon
4c. This reaction is an example of
where a compound is broken down by heat.
4d. Other carbonates behave in the same way, for example this green powder on heating changes to a black powder and a colourless gas, the word equation is ...
copper carbonate ==>
oxide + carbon dioxide
5a. Quicklime reacts with water to form
(calcium hydroxide).
5b. Like limestone, it can be used to treat soil that is too
for healthy plant growth.
6. Limestone is heated with clay to make
, and when this is mixed with water, sand and gravel it makes
.
7. The material
is made by heating limestone with
and '
' (whose chemical name is sodium carbonate).
8a. To test a mineral rock to see if is a carbonate, you add
acid.
8b. If the rock 'fizzes', the gas is collected and bubbled into
. to test to see what gas was evolved.
8c. If the limewater turns
, it means the gas was
dioxide which is always formed when a carbonate reacts with an acid.