A compound with formula AL (XF4) 3 contains (unidentified) element X, which is 11.3% by mass of the composition of the substance. What is identity of element X

What type of virus hides out inside the host cell for a time before it becomes active

What do dust, smoke, salt, and chemicals have in common? A. They are gases in air. B. They make up water vapor in air. C. They are particles in air. D. They are found only in pure air.

A doubling of the concentration of a doubles the rate of the reaction. a. True b. False

The electron configuration for an atom is 1s 2s 2p2. How many electrons does the atom have? 2 4 5 6

What is true of all particles of gas enclosed within a container? They move at different speeds. They have the same kinetic energy. They never collide with each other.

How many moles of nitrogen gas are in a 10.0 L container at STP? a. 0.45 moles b. 22.4 moles c. 10.0 moles d. 6.02 x 1023 moles

In your own words, explain John Martin s theory about iron dumping.

List four common signs that a chemical reaction has occurred.

How does water evaporate from: (different things)

The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?