An 8.00-g sample of aluminum reacts with oxygen to form 15.20 g of aluminum oxide. how many grams of oxygen are used in the reaction?

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in