Refer to attachment please (this is just so I can study so pls show how u did them aswell)

thats a little if u want the answer just look it up on google thats what i do haha : )

it means there are 3 atoms of oxygen

answer; talc and gypsum;

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !