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:
Explanation:
We know the area of the rectangle is length * width
We also know width = length - 5
Thus area is 
Answer:
would be like your hair,eyes,smile etc.
Explanation: