According to the Periodic Table of Elements, Calcium has:

A. 20 protons and 20 electrons

B. 40.08 protons

C. 20 protons and 20.08 electrons

D. 20 protons and zero electrons

Which element on the periodic table is the most electronegative? A) Cesium B) Fluorine C) Hydrogen D) Radon

The volumetric flow rate of aniline is 1500 cm/min. What is the mass flow rate in g/sec? What is the molar flow rate in kmol/min? (2) The volumetric flow rate of a 4M ammonium nitrate aqueous solution is 450 m/hr.

A sample of NaNo3 weighing 0.38g is placed in 50.0mL volumetric flask. The flask is then filled with water to the mark on the neck, dissolving the solid. What is the molarity of the resulting solution.

The standard hydrogen electrode: Select the correct answer below: is often used as a control in the laboratory. is a simple, safe, and easy-to-create electrode.

At a job interview, the most effective way to prove your proficiency to a prospective employer is to show that you have A. experience with on-line research. B. your own test equipment. C. membership in several professional organizations. D.

Which energy change occurs during boiling? A. Some heat energy of the substance is lost. B. Heat energy of the substance remains the same. C. Most heat energy of the substance is lost. D. Heat energy is absorbed by the substance.

How many liters of phosphine are formed when 0.42 L of hydrogen react with phosphorus

Which sample of matter has the greatest distance between molecules at STP? A) N2 (g) B) NH3 (aq) C) C6H14 () D) C6H12O6 (s)

What happens is that passes through the Catapillar's in the small intestine

One mole of a monatomic ideal gas is subjected to the following sequence of steps: a. Starting at 300 K and 10 atm, the gas expands freely into a vacuum to triple its volume. b. The gas is next heated reversibly to 400 K at constant volume. c.