What reactants can i use in the preparation of calcium carbonate salt?

In saturated organic compounds, all the bonds between carbon atoms are called?

What is a number added in front of a formula in order to balance the equation

What is the importance of interlocking the fingers and rubbing while washing hands? the palms are the dirtiest parts of the hands. the spaces between the fingers get washed. the backs of the hands get washed. the fingernails are the dirtiest parts of the hands