Why should you never heat a test tube that is closed?

Using a 300 MHz NMR instrument: a. How many Hz downfield from TMS is a signal at 2.5 ppm? b. If a signal comes at 1200 Hz downfield from TMS, at what ppm does it occur? c. If two peaks are separated by 2 ppm, how many I-AZ does this correspond to?

Which element is oxidized in the following reaction: CuO (s) + H2 (g) Cu (s) + H2O (l)

A buffer contains the weak acid HA and its conjugate base A-. the weak acid has a p Ka of 4.82 and the buffer has a pH of 4.25.

What is the atomic number for neon?

What is the value of q when the solution contains 2.00*10-2 m sr2 + and 1.50*10-3m cro42-?

You sealed an Erlenmeyer flask that was determined to have a volume of 272.2 mL with a stopper. The density of air at 25°C is 0.001185 g/mL. Air has an effective molar mass of 28.96 g/mol. What amount of air was sealed in the flask?

Let's say we start with 2.2lbs of uranium. If the half-line of U-235 is 703.8 million years, how much uranium will we have after 2,815 million years

When sulfuric acid (h2so4) loses its hydrogen in exchange for calcium it becomes a (ch 8) : ?

A laboratory requires 2.0 L of a 1.5 M solution of hydrochloric acid (HCl), but the only available HCl is a 12.0 M stock solution. How could you prepare the solution needed for the lab experiment? show all work to find your answer

What is the primary function of neurons?