Answer:
1) B. The change in energy in a system during an exothermir reaction
2) B. In the air, only the oxygen is part of the system
3) B. The energy found in the reactants....
4) D. This is an endothermic reaction because the system took energy from the surroundings.
5) B. Energy is released by the formation of chemical bonds
Explanation:
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Answer:there is a vgraph so where it says 4 at the bottom then go under to -2 then ur done.
Explanation:
$522
20% of 358 of 69.6 so we add those together. Then, 25% of the sum is 522
