Respuesta :

quandaledinglefan123

Answer:

First one is hydrogen and oxygen

Second one is color change, solid dissolves, and temperature increases

Explanation:

Electrolysis is the process of using electricity to decompose water into hydrogen and oxygen.

Odors and change of states are physical changes while the rest are chemical changes.

Hope this helped!

LucasEJP
For question one it’s Hydrogen and Oxygen!
For the second question , it’s colour change since the temperature increases

For the first one the general idea is that Hydrogen molecules violently react with oxygen when the existing molecular bonds break and new bonds are formed between oxygen and hydrogen atoms. As the products of the reaction are at a lower energy level than the reactants, the result is an explosive release of energy and the production of water

Second one is harder to remember but, changes of state (colour) are physical changes whereas the other changes are purely chemical

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