Identify the atom it has 19 protons 19 electrons and 17 neutrons and a mass of 39 amu

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred.

When an electron is displaced in a semiconductor, the hole that's left behind is A. attracted to the negative terminal of the voltage source. B. attracted to the anode of the voltage source. C. considered an impurity in the crystal. D.

What is the pOH of a solution with a pH of 8? 14 6 8 0

What intermolecular force (s) is/are present in solid SO3? 1. London dispersion 2. dipole-dipole 3. hydrogen bonding

Determine the oxidation state of the metal ion in [co (nh3) 5br]2+. express your answer as an integer.

The inertness of the noble gases is due to a. the outermost shell has six electrons. b. the bonds they form with other elements. c. the number of protons and neutrons. d.

Xander is gaining weight. Which best describes what he can do to prevent obesity? exercise every day and also make healthy choices in his diet excercise once a week but make no change in his diet exercise once a week and also make healthy choices in

The town in the video stressed using locally made goods instead of imported goods. How could using locally made goods lower CO2 emissions?

Calculate the ΔHrxn for the following reaction: CH4 (g) + 2Cl2 (g) - - > CH2Cl2 (g) + 2HCl (g) Use the following reaction and given ΔH's: CH4 (g) + Cl2 (g) - - > CH3Cl (g) + HCl (g), ΔH = - 99.

Select all that apply to diffusion. A solid cannot diffuse in to another solid. Solids can diffuse in liquids. Liquids can diffuse in liquids. It is the process of intermingling atoms from one substance into another.