How many moles of aluminum are needed to make 9 moles of molecular hydrogen? given the reaction: 2 al + 6 hcl → 2 alcl3 + 3h2 6 moles 4 moles 3 moles 2 moles none of the above?

4 physical properties of lanthanum

Write the acid-base equilibrium reaction between clo - and h2o. ignore phases.

When the pH imcreases from 1 to 3, the concentration of hydrogen ions increases by a factor a. 10 b. 100 c. 2 d. 1000

Samantha & Ryan are investigating an unknown substance. They make the following observations about the substance: 1. it is black 2. it has a dull luster 3. it weighs 6.50 g 4. it is solid 5. it is roughly 2 inches long 6.

What conclusion can you make about a hypothesis that contradicts an existing theory?

A container has a volume of 200 L at 0.94 atm and 25 C. The pressure changes to 1.00 atm and the temperature changes to 0 C. What is the new volume of the container

f litmus paper is dipped in an acidic solution and then in a basic one, what will happen? The paper will turn from blue to red. The paper will turn from red to clear. The paper will turn from blue to clear. The solution will turn from red to blue.

You need to make an aqueous solution of 0.125 M barium chloride for an experiment in lab, using a 250 mL volumetric flask. How much solid barium chloride should you add?

Relative to the sum of the masses of its constituent nucleons, the mass of a nucleus is: greater the same smaller sometimes greater and sometimes smaller

Smallpox epidemic among Native Americans?