Which of the following does not happen during a chemical change?

the identities of the substances change.
bonds are broken and new bonds are formed.
some atoms disappear as energy is released.
compounds are broken down and/or formed.

What is the mass of sodium in 3 moles of sodium chloride

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.

What term describes technology that operates on an atomic level