1. what occurs when an atom of chkorine and an atom of hydrogen become a molecule of hydrogen chloride?
a) a chemical bond is broken and energy is released
b) a chemical bond is broken and energy is absorbed
c) a chemical bond is formed and energy is released
d) a chemical bond is formed and energy is absorbed
2. The stability of an isotope is based on its
a) number of neutrons, only
b) number of protons, only
c) ratio of neutrons to protons
d) ration of electron to protons
3. the relationship between pressure and volume for an ideal gas?
4. which equation shows conservation of both mass and charge?
a)Cl2+Br- --> Cl- +Br2
b) Cu + 2Ag+ --> Cu2+ + Ag
c) Zn + Cr 3+ --> Zn 2+ + Cr
d) Ni + Pb2+ --> Ni2+ + Pb
please explain in details. thank you