The answer is B. uniform in composition.
Answer: 
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Thus in the reactants, there are 2 atoms of hydrogen and 2 atoms of iodine .Thus there has to be 2 atoms of hydrogen and 2 atoms of iodine in the product as well. Thus a coefficient of 2 is placed in front of HI.
The balanced chemical reaction is:
Need more info, give some numbers or a picture of the problem
Answer:
When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.
Answer:
When the drumstick hits the drum, it exerts a force on the drum. Newton’s third law states that if a force from object A is exerted onto object B, then an equal and opposite force from object B is exerted onto object A. By Newton‘s third law, the drum also exerts a force on the drumstick.
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