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PLS HELP! Answer these questions pls. I will mark BRAINLIEST, FIVE STARS AND THANKS. The second question in the pic has three answers. *50 POINTS!*
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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