The decomposition of CaCO3 is given by the equation: CaCO3(s) → CaO(s) + CO2(g) A student heats a 5 g pellet of CaCO3 strongly for 10 minutes over a Bunsen burner flame. After cooling, the student uses an open container to measure the mass of the products formed and finds this to be 2.8 g. Provide an explanation for the decrease in mass of the products compared to the reactant and work out how many molecules of carbon dioxide would form in this reaction.

Must show your work. Include appropriate significant figures and units.​

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n