Which is a characteristic of a physical change? (1 point) a

The chemical bonds in the substance are unchanged.

b

The change cannot be seen.

c

The molecules all move at the same speed.

d

The substance has reacted with another substance.

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.

How is sound is different from music how loundness od sound mention some ways to reduce