If the total mass of the products of a reaction is less than the mass of the reactants, what must be true?
a nuclear reaction has taken place.
a chemical reaction has taken place.
nuclear fusion has occurred.
nuclear fission has occurred.

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.

Draw the lewis dot structure for each of the following polyatomic ions

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds