How many moles of PbS are equivalent to 458g PbS

Students test diferent substances to determine which are soluble. The ingredients include lemon juice, sand, saltand sugar. After repeated tests of each substance, the students conclude all of the following have the ability to dissolve exept

Enter ionic and net equations: feso4 (aq) + na3po4 (aq) arrow fe3 (po4) 2 (s) + na2so4 (aq)

Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group with calculators, the other group without calculators.

Which of these compounds would you expect to be least soluble in water? ch3oh nacl n2 nh3 not enough information?

A chemical equation is shown: C2H4 + O2 → CO2 + H2O According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction? 5 6 7 8

During which process can 10.0 milliliters of a 0.05 M HCl (aq) solution be used to determine the unknown concentration of a given volume of NaOH (aq) solution? (1) evaporation (3) filtration (2) distillation (4) titration

Which one of the following concept of air is least necessary

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50°C and at 75°C. Which of the following statements concerning the studies is correct?

Anhydrous calcium chloride removes water vapor from the air inside a container having an air-tight seal called a desiccator. Explain

A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?