AYD POR FAVOOOR SE LOS PIDO los movimientos del rol atras son

1,2.3,4,5

5,4,3,2,1

The answers would be: 1: the liquid only contains one compound4: the liquid is a pure substance

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.