PLEASE HELP ME If a radioactive substance has an initial mass of 50 grams and its mass halves every 5 years, what is the number of
grams remaining after 20 years?

The pressure inside a hydrogen-filled container was 2.10 atm at 21 ? c. what would the pressure be if the container was heated to 92 ? c ?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

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.