The chemical name of lime is ______.
Calcium Oxide
Understanding the Chemical Name of Lime
The term "lime" can refer to several calcium-containing inorganic materials, but commonly it refers to calcium oxide or calcium hydroxide. When the question asks for the chemical name of lime, it most often refers to calcium oxide, also known as quicklime.
Chemical Composition of Lime (Quicklime)
Quicklime is produced by heating calcium carbonate (like limestone or seashells) to high temperatures, which drives off carbon dioxide. This process is called calcination.
The chemical formula for calcium oxide is \(\text{CaO}\).
Therefore, the chemical name of lime, specifically quicklime, is Calcium Oxide.
Analyzing the Options
Let's look at the given options and their common chemical names and formulas:
| Option | Chemical Name / Common Name | Chemical Formula |
|---|---|---|
| 1. Calcium Oxide | Quicklime / Lime | \(\text{CaO}\) |
| 2. Sodium Bicarbonate | Baking Soda | \(\text{NaHCO}_3\) |
| 3. Calcium Carbonate | Limestone / Marble / Chalk | \(\text{CaCO}_3\) |
| 4. Silicon Dioxide | Silica / Sand | \(\text{SiO}_2\) |
Based on this comparison, Calcium Oxide is the chemical name for lime (quicklime).
Why Other Options Are Incorrect
- Sodium Bicarbonate: This is commonly known as baking soda and is used in cooking and cleaning. It is not lime.
- Calcium Carbonate: While Calcium Carbonate (\(\text{CaCO}_3\)) is used to produce lime (\(\text{CaO}\)), it is limestone, not lime itself.
- Silicon Dioxide: This is the primary component of sand and quartz and is not related to lime in this context.
Revision Table: Key Chemical Compounds
| Chemical Name | Common Name | Chemical Formula |
|---|---|---|
| Calcium Oxide | Lime (Quicklime) | \(\text{CaO}\) |
| Calcium Hydroxide | Slaked Lime | \(\text{Ca(OH)}_2\) |
| Calcium Carbonate | Limestone, Marble, Chalk | \(\text{CaCO}_3\) |
| Sodium Bicarbonate | Baking Soda | \(\text{NaHCO}_3\) |
| Silicon Dioxide | Silica, Sand, Quartz | \(\text{SiO}_2\) |
Additional Information about Lime
Quicklime (\(\text{CaO}\)) reacts strongly with water to form calcium hydroxide (\(\text{Ca(OH)}_2\)), also known as slaked lime. This reaction releases a significant amount of heat.
\(\text{CaO(s)} + \text{H}_2\text{O(l)} \rightarrow \text{Ca(OH)}_2\text{(aq)}\)
Slaked lime is used in various applications, including:
- Water treatment
- Neutralizing acidic soils (agricultural lime)
- Mortar and plaster in construction
- Manufacturing of paper, steel, and glass
Important Questions from Chemistry in Everyday Life
Which of the following is a greenhouse gas?
I. Methane
II. Nitrous oxide
The gas which turns lime water milky is:
Liquefied Petroleum Gas (LPG) is mainly a mixture of:
Which one of the following is not a form of condensation?
Which of the following metal is used for making cooking vessel?
