A student is investigating the affect of roped off and a different type of
different salts on melting points. Four patches of ice of equal size are
iS salt is poured on each, one receives table salt (NaCI), one receives Calcium Chloride (CaCl2),
one receives Potassium Carbonate (KCO3)
The student measures the volume of ice
and the fourth receives inert sand instead. Each patch receives an equal amount of salt or sand. The s
from the original volume
remaining and subtracts it
of ice to see how much melted away. What is
a control variable in this experiment?
© A. None of these.
O B. The
size of the ice patches.
® C. The type of salt applied to the ice.
amount of ice that melted.
• D. The

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.

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

May someone me with these science questions