<h3>Changes can occur to the physical properties of a substance, but the chemical composition of the substance remains the same.</h3>
Explanation:
A physical change can not change the chemical makeup of a substance. If it did, it would be considered a chemical change. It can, however, be physically changed.
<span>Calculating mass using Atomic Mass Units (amu):. Ex. Calculate the mass, in amu, of a sample of aluminum that contains 75 atoms. 1 Al atom = 26.98 amu.</span>
3.815 that's the awnser......................................
Answer:- The charge is +2.
Explanations:- Z stands for atomic number. The Z is given as 25 means the atomic number of the element is 25. It has 23 electrons. For a neutral atom the number of electrons is same as the atomic number. Since the number of electrons is less than atomic number, the atom must have lost the electrons.
Number of electrons lost = 25 - 23 = 2
If the element lost electrons then it has positive charge. As, the electrons are lost, the charge is +2.
Answer: option d
Explanation:
Project teams must be proactive. Each member of the team should empowered and each member can share ideas and experience in order to make the WBS more precise.
