Which of the following methods of improving air quality does not require advanced technology? a. exhaust scrubbing b. conservation c. using renewable energy sources d. driving fuel-efficient cars

Calculate the number of moles of ethane in 100 grams

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

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!