Answer:
In the first equation, it's H20 but the second is B
2Mg + 2O2
A and D, sorry if I’m wrong.
Answer:
Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form.The primary reason for converting numbers into scientific notation is to make calculations with unusually large or small numbers less cumbersome.
Step-by-step explanation: