An engine is running by burning coal. Which statement is correct? The engine created energy to perform work.
The coal created energy to operate the engine.
The source of energy was created by the sun.
The energy used to perform work can be traced back to the sun.

C

Explanation:

The process of burning coal is created by the energy of the sun.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

the answer is barium and copper bromide