A pure substance made of one kind of atom

Describe the displacement of ammonia from its salts by warming with an alkali

Which p[robing question lies within the scope of physic?

Express a time period of exactly 7 day in terms of seconds.

Steve traveled the first 7 hours of his journey at 40 mph and the last 9 hours of his journey at 50 mph. How long is the whole journey in miles? - miles

Why does the rate of a reaction generally increase with increased temperature? (Choose all that apply) A. at higher temperatures, molecules are more likely to collide with each other in the correct orientation. B.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3

If you start with 100 grams of a radionuclide, how much will you have after two half-lives have passed?

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?