A chemistry student answered 81 questions correctly on a 90-question test. What percent of the questions did they get CORRECT?
HURRY PLEASE

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

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)

What is the effect of returning nuclear reactor cooling water back into bodies of water?