The first one is B because it’s gonna be positive if it’s gaining energy
All of these are compounds except oxygen because a compound is two or more different elements bonded together.
How many moles of water at produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas the answer is D
Sonia observed that the two balloons repelled each other. This is because both balloons acquired the same charge when she rubbed them with the piece of wool, and like charges repel each other.
