Which answer below correctly identifies the type of change and the explanation for the change in calcium carbonate?
physical change because even though a state change was observed, the calcium carbonate
retained its original properties
physical change because even though a particle size change was observed, the calcium
carbonate retained its original properties and was not transformed into a new substance
chemical change because a state change was observed, which indicated that the calcium
carbonate was transformed into a different substance
chemical change because a particle size change was observed, which indicated that the calcium
carbonate was transformed into a different substance
C

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

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.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?