Which type of reaction is Mg + S → MgS? A. polymerization
B. synthesis
C. replacement
D. decomposition

After cloud droplets form, what must happen to them for precipitation to occur?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6