Answer:
Option D is good to go!
Explanation: as per the reactivity series more reactive substances will react with the counterpart substance.The most reactive substance here is calcium while the least reactive is aluminium, the magnesium comes in between.As per their reactivity, these substances will react with oxygen.
Explanation:
D. They all contain carbon as an important part of their structure.
They can use them to find the age of fossils.
Must be C because the liquid fuel is Codium nitrate to be used in rocket engines
0.500 moles is roughly .5*6.022*10^23=3.011*10^23 atoms. This is independent of STP.
