How does baking soda and vinegar show conservation of mass?

PLEASE HELP DUE IN 5 MINUTES!

1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

Starch and are common polysaccharide carbohydrates found in plants. sucrose glycogen fructose cellulose

What is the overall order of reaction for rate = k[no2]2 ? second order 3/2 order third order zero order none of the listed answers are correct