25 miles/gallon should be the answer
hope this helped out hon :)
Answer:
All chemical reactions need energy to get started. Even reactions that release energy need a boost of energy in order to begin. The energy needed to start a chemical reaction is called activation energy.
Explanation:
The answer is option D
That is when an electric current is passed through liquid water, hydrogen gas accumulates at one electrode and oxygen gas accumulates at the other, a chemical change has occurred with energy being absorbed.
This process is called electrolysis of water in which hydrogen gas accumulates at one electrode and oxygen gas accumulates at the other. In it decomposition of water occurs chemically using electricity as the energy source.
The answer is Sliver reacts with nitric acid to produce a gas.
Answer:
A
Explanation:
Because density is a physical property and the rest are all chemical properties