7. How many moles of FeCl3 are needed to produce 805 grams of

MgCl2?

A. 157 moles

B. 450 moles

C. 5.64 moles

D. 7.35 moles

The heart is protected from the bones by the.

Which statement about the effusion rates of nitrogen and oxygen is true? Oxygen effuses 1.07 times faster than nitrogen. Nitrogen effuses 1.07 times faster than oxygen. Oxygen effuses 0.9 times faster than nitrogen. Nitrogen effuses 0.

The nucleus of an atom can have either a positive or negative charge

What is one kind of trait or characteristic that all of the solids have in common

New Pressure of gas when temp is 235 k

In a closed system, the total heat given off by warmer substances equals the total heat energy gained by cooler substances (qwater = - qliquid).

What compound will not give oxygen on heating

Choose one property of water that makes it unique. Describe the property and explain the chemical or physical?

An object is dropped onto the moon (g m = 5 ft/s 2). how long does it take to fall from an elevation of 250 ft.?

Which type of luster gives the mineral the appearance of metal?