What is the difference between an element and a compound? (p. s. it due in 5 mins ASAP so hurry.)

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11

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?

What is the common name for the compound shown here? enter the common name of the compound shown?