What happens when an electron moves from a higher energy level to a lower one

Crude oil is separated into different substances such as gasoline, petroleum, diesel fuel, and propane by which process? Osmosis Chromatography Filtering Fractionation

Apply molecular orbital theory to determine the bond order in na2.

What is the best reason for using iron filings (shreds) instead of an iron nail in a chemical reaction?

How many protons would be found in the ion whose symbol is Ag+?

Platinum has a density of 21.45 G / CC. gold has a density of 19.3 G / CC. a) which is larger 100 gram cube of platinum or a hundred grand cube of gold? b) what is the length of each side of a 100 gram cube of platinum?

Find the mass in 2.6 mol of lithium bromide. (Hint: You need to write the formula)

Which of the following would NOT be a conversion factor for mole to mole calculations for the following reaction: 2Al 3Cl2 - -> 2AlCl3?

A negative ion has more A. protons than electrons B. electrons than protons C. neutrons than protons

A team of researchers is investigating a new carbon-rich molecule important to life. They find evidence for the presence of a carbon-carbon double bond in the molecule. This observation means that the new molecule likely exists as _.

Read the list of elements given below. He, Ne, Ar, Kr Which of the following about the elements is true? All of them are unreactive gases. All of them are reactive metalloids. He and Ne are unreactive gases and Ar and Kr reactive metalloids.