What phase change requires a substance to absorb energy?

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

What is the most stable monatomic ion formed from nitrogen

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.