I NEED HELP What is CaCO3 in this chemical equation?

CaCO3 → CaO + CO2

A. a chemical formula representing a reactant

B. a chemical formula representing a product

C. a chemical symbol representing a reactant

D. a chemical symbol representing a product

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?