Which of the following equations represents a double-displacement reaction?

A. FeS (s) + 2HCl (aq) ® H2S (g) + FeCl2 (aq)

B. 2Sb (s) + 3I2 (g) ® 2SbI3 (s)

C. Zn (s) + H2SO4 (aq) ® ZnSO4 (aq) + H2 (g)

D. 2HgO (s) ® 2Hg (l) + O2 (g)

Infrared light is an example of which form of energy? a. thermal b. chemical c. nuclear d. electromagnetic

How is bacteria, a rose, and an elephant alike?

The distance between the earth and the sun is 90 million miles calculate this distance in meters up to three significant figures

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.60 atm. The piston was pushed down to change the volume to 1.00 L.

The atomic number is what?

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?