How would the mass of one mole of magnesium atoms compare to the mass of one mole of iron

Al2O3 occurs in nature as a mineral called corundum, which is noted for its hardness and resistance to attack by acids. Its density is 3.970 g cm-3. Calculate the number of atoms of Al in 25.00 cm3 of this mineral.

If an element has an atomic mass of 127 and an atomic number of 53, how many neutrons does it have? 74 127 53 75

The electrical conductivity of an aqueous solution depends on the concentration of which particle in the solution

Even the demand for a necessity such as gasoline will respond to a change in price, especially over a longer time horizon. a. TRUE b. FALSE

Which of the following describes a condition in which an individual would not hear an echo? A. An individual is standing 30 meters in front of the reflecting surface. B. The reflecting source is approximately 21.5 meters from the individual. C.

What should you use if you wan to measure ph correctly?

One international nautical mile is defined as exactly 6076.1155ft, and a speed of 1 knot is defined as one international nautical mile per hour. Question what is the speed in meter per second of a boat traveling at a speed of 18.8 knots

Which of the following is the best example of a valid hypothesis? A People should eat vegetables. B Children like Jiffy™ peanut butter better than Skippy™ peanut butter.

Is freezing water a physical or chemical change

When would a cell use Active Transport? Mark all that apply. a. When the cell needs to move a compound down its concentration gradient. b. When the cell needs to move a compound against its concentration gradient. c.