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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Let the side of square be <em>s</em> and the length and breadth or width of the rectangle be <em>l </em>and <em>b </em>respectively. (Also, keep in mind that when I am using the * symbol, it stands for multiplication)
s = b + 1
l = 2b - 1
Perimeter of rectangle = 2(l+b) = 2(2b-1+b) = 2(3b-1) = 6b - 2
Perimeter of square = 4(b+1) = 4b + 4
6b - 2 = 4b + 4
6b - 4b = 4 + 2
2b = 6
b = 6/2 = 3 cm
l = (3*2) - 1 = 6 - 1 = 5 cm
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8 and 1/2 yeah this is the answer
I think the answer is d. the moon's umbra only covers a small area on earths surface.
