Two chemical reactions are shown: 2Mg + O2 → 2MgO
CaCO3 → CaO + CO2

Which statement is true?
Both are synthesis reactions.
Both are decomposition reactions.
A is a synthesis reaction, and B is a decomposition reaction.
A is a decomposition reaction, and B is a synthesis reaction.

0.66y = 0.9x + 0.48 if y has a value of 108.45 what is the value of x?

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!