Final answer:
Calcium carbonate (CaCO3) is a compound because it contains multiple elements chemically combined. The ratio of calcium to carbon to oxygen in the formula is 1:1:3.
Step-by-step explanation:
The formula for calcium carbonate is CaCO3.
a. Calcium carbonate is a compound. This is because it is composed of more than one element chemically combined in a fixed ratio. Specifically, it contains calcium (Ca), carbon (C), and oxygen (O) atoms.
b. The ratio of Ca:C:O atoms in calcium carbonate is 1:1:3. This means that in the molecule of calcium carbonate, there is one calcium atom, one carbon atom, and three oxygen atoms.
CaCO3 is an example of a compound.
Calcium carbonate (CaCO3) is a chemical compound made up of the elements calcium (Ca), carbon (C), and oxygen (O). It is a white, crystalline solid found in various forms such as limestone, chalk, and marble. It is commonly used in the production of cement, as a dietary supplement, and in many other applications.