Questions

It returns -1

A galvanic cell is also known as voltaic cell provides electrical energy from the chemical energy.

The freezing point of water and melting point is 0 °C or 32 °F. The temperature may be lower if supercooling occurs.

The sentence that states the main idea of the paragraph is called as Thesis or the topic sentence.

Covalent bonds hold atoms together because the attraction between the positively charged nuclei and the negatively charged shared electrons is greater than the repulsions between the nuclei themselves.

An Illustration is a visual image created to accompany words to depict them.