8. How many moles of H2SO4 are there in 980g of the substance?​

Select the atomic models that belong to the same element

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.