Give any two reasons why we need to separate things in our daily life.​

Label a-f based on the table using c for concentrated and d for dilute

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!

What is the chemical formula for the compound formed between sodium and flour one