Why would sand and water be an example of a heterogeneous mixture? select all that apply. chemical bonds are formed between the sand and water. *the mixture does not have a uniform appearance. *the mixture does not maintain a uniform composition. the sand stays suspended in the water.

Explain why scientists use shared characteristics to make cladograms.

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?