What is the correct symbol equation for the reactions between propanoic acid + sodium carbonate?

The reaction q+r2=r2q is found to be first order in r2 and

Compare and contrast physical changes with chemical changes.

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.