HELP PLZ?? REALLY URGENT !!!

Balance the following equation:
a. Mg(OH)2+ HCl MgCl2+H2O
b. b. Al(OH)3 Al2O3+H2O
c. c. HNO3+Ca(OH)2 Ca(NO3)2+H2O
d. d. KMnO4 +HCl KCl+ MnCl2+H2O+Cl2
e. e. Cu2S+O2 Cu2O +SO2

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

Which one of the following bonds would you expect to be the most polar? a) b–h b) n–h c) p–h d) al–h e) c–h