Why is it advisable to wear long sleeves when students work in a chemistry lab? to provide warmth near the lab refrigerator to protect the arms from lab chemicals to minimize burns from hot water at the lab sink to prevent burns when using a bunsen burner

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

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?

Which of these is an intensive property of a substance