3. Give one example of an element and one

example of a compound. Explain how they

are different.

What is the wavelength of a wave having a frequency of 2500 Hz

How do you dispose of an unknown chemical

According to the valence-bond model, what atomic orbitals overlap to form each of the following chemical bonds?

Calculate the mass of 1.9 • 10^24 atoms of Pb

What is the acetal formed when propanone reacts with two molecules of methanol?

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?