An aqueous solution contains 0.60 mol of KCl and 1.20 mol of NH4Cl what is the minimum number of moles of Pb(NO3)2 that must be added to precipitate of chloride ions?

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver