Correct answer is <span>Fuels do not have to be purchased to generate power.</span>
It is not directly over a flame because it depends on the substance you might not want to heat it too much.you never know what could happen
Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases. you use them if you want to know if a solution is an acid or it it's a base
Answer:
B) Protons and Neutrons
Explanation:
In every atom, there is a Nucleus which contains protons and Neutrons. Protons being positive and Neutrons not having a charge (neutral).
