Viết các phương trình phản ứng xảy ra (nếu có) khi cho các chất sau CH3CHO, CH3COCH3 lần lượt tác dụng với: Ag2O/NH3, CH3MgBr, NaHSO3, LiAlH4, Cu(OH)2.

Sand is more likely than shale to preserve fossils. true false

What happens after sound waves create vibrations in the ear?

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.