Astudent says that since the atomic theory is just a theory, it should not be considered useful. which statement best argues against the student’s opinion? a) scientific theories change over time b)scientific theories are the results of many experiments and observations c) scientists often do not agree about specific details of scientific theories d) scientists often propose competing theories e) scientific theories do not become scientific laws

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.