6. In a hexagonal close-packed crystal, every atom (except those on the surface) has

neighbors.

6

8

12

10

What are the two properties of the ink components that determine their movement along the chromatography paper/fabric (see Introduction) ?

A 0.105 L sample of an unknown HNO 3 solution required 35.7 mL of 0.250 M Ba (OH) 2 for complete neutralization. What is the concentration of the HNO 3 solution?

When a radioactive atom emits an alpha particle, the original atom's atomic number decreases by four.

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 4.11 g/mL, 4.81 g/mL, 4.95 g/mL, 3.75 g/mL. If the actual value for the density of the sugar solution is 4.

Gas is $2.50/gal at Station A and 85 cents/L at Station B. A) Convert the cost of gas at Station B to $/gal. B) At which station would you buy gas?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?

Consider the reaction: 8H2S (g) + 4O2 (g) →8H2O (g) + S8 (g). Δ[H2S]/Δt = - 0.033M/s. Find Δ[O2]/Δt. Δ[H2O]/Δt. Δ[S8]/Δt. Find the rate of the reaction.

At room temperature and pressure what is the volume of one mole of oxygen?

Ibuprofen, a common pain remedy, has an empirical formula of C7H9O and a molar mass of approximately 218.078 grams per mole. What is the molecular formula of ibuprofen?