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A rock contains 0.153 mg of lead-206 for each milligram of uranium-238. The for the decay of uranium-238 to lead-206 is 4.5 × 109 yr. The rock was formed ________ years ago.

Determine the identity of the daughter nuclide from the alpha decay of Th.

Calculate ΔS°rxn for the following reaction. The S° for each species is shown below the reaction. N2H4(l) + H2(g) → 2 NH3(g) S° (J/mol∙K) 121.2 130.7 192.8  

Arrange the following in the order you follow in the extraction process.

Simple distillation is only an effective technique to purify a mixture of liquids if the liquids have very different boiling points. That difference should be greater than

A volatile liquid and water have a difference of 10 degree Celsius in boiling point. What would be the suitable separation technique for a mixture of both substances?

If you were performing this same distillation at a higher elevation for example, at 300 meters above sea level, how do you think the initial boiling point of the mixture in the distillation flask would change?

How did you determine the purity of your compound?

How far should you insert the thermometer into the distillation head?

Which of these funnels would you use in suction filtration?