Determine the length with accuracy and correct degree of precision. 12.48 cm, 12.5 cm, 2.10 cm,12 cm

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

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?