In the chemical laboratory why do scientists use a mortar and pestle

Of the elements Fe, Hg, U, Te, and Y, which is considered a Group A element? A. Fe B. Hg C. Te D. Y

Convert 298.8 K to °C. Enter the correct number of significant figures.

The molar mass of nitrogen gas is 28.0g/mol. A 100.0-g sample of air contains how many moles of nitrogen

Which of these describes an exothermic reaction? A. Energy is transferred by the reaction B. No energy is absorbed by the reaction C. Energy is released by the reaction D. Energy is created by the reaction

44Given the equation representing a reaction at equilibrium : 2SO2 (g) + O2 (g) = = > 2SO3 (g) + heat Which change causes the equilibrium to shift to the right?

The 4 main layers of the atmosphere are organized according to what?

Which layer of soil in the diagram contains clay and other particles of rock but little humus?

Sodium can achieve greater stability in its valence shell by

Resonance in air columns is used in which of these musical Instruments?

A student prepared a standard stock copper (II) sulfate solution with an absorbance value of 0.862. The student then decided to prepare a second solution containing copper (II) sulfate from the standard stock solution.