In the reaction HF + Al AlF3 + H2, which two substances would have a coefficient of 2 if the reaction were balanced?

Check all that apply.

A. H2

B. Al

C. AlF3

D. HF

Why do jupiter and saturn have no blue methane cloud tops?

A liquid has a specific gravity of 1.1 at room temperature. what is its density at room temperature kg/m3

A space heater primarily converts electrical energy into A. light energy B. mechanical energy C. sound energy D. thermal energy

A student swings a bat horizontally, making contact with a ball thrown to her. The ball leaves the bat, and the bat continues moving through the rest of the swing.

A sphere is charged with electrons to -1 * 10-5 C. How many electrons make up this charge? The elemental charge is 1.6 * 10-19 C.

Why does Alpha Centauri appear to be yellow-white?

In order to determine speed, you must know

Which of the statements best describes the relationship between the surface of an object and the amount of friction it produces? A.) The smoother the surface of an object, the more friction it will produce. B.

Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude

Esimate and add to the nearest thousand 6,521+1,063+901