A sample of nitrogen gas (N2) containing 1.5 x10^23 particles has the same number of particles as a sample containing:

A.

0.50 moles Ne

B.

2.0 moles He

C.

1.0 moles hydrogen gas

D.

25 moles oxygen gas

Which pair of atoms has the highest electronegativity difference? A. Na-F B. Ca-F C. H-F D. C-F E. F-F

Which determines the rate at which a solid solute dissolves in a liquid solvent? A) The frequency of the collisions between the solute particles. B) The frequency and energy of the collisions between the solute and solvent particles.

What two general products do combustion reactions create?

What are the top three materials by weight in a computer?

Consider a neutrally charged atom that has an atomic mass number of 80, which includes 35 neutrons. how many electrons does this atom have?

Chemists use activity series to determine whether which type of reaction will occur?

1. Does the temperature rise or drop when you mix vinegar and baking soda. 2. Does the temperature rise or fall when you mix baking soda and water.

Use the balanced equation from number four above to determine the limiting reactant if we had a mixture of 5.0 moles of Fe and 4.0 moles of O2.

Using the kinetic theory what happens to oxygen particles as they are cooled

Identify the following: 1. The only 2 liquid elements. 2. The element in period 4, group 0. 3. The second metalloid in period 4. 4. The first element in group 4A.