The election configuration has of an element is 1s^2 2s^2 2p^1. How many valence electrons does the element have?

a gas has a pressure of 1.5 atm, and occupies a volume of 16 L. what will be the new pressure if the volume decreases to 10 L

helium gas in a 2.00 L cylinder is under 1.12 atm pressure. At 36.5°C that same gas sample has a pressure of 2.56 atm. What was the initial temperature of the gas in the cylinder?

How many grams of sulfur dioxide are there in 12 liters of sulfur dioxide?

Which element is a liquid at 305K and 1.0 atmosphere?

Where does transuranic waste come from and what are methods of disposal

As transformações estão presente em nosso cotidiano, elas nunca param de acontecer, na sua maioria invisível a olho nu. Quais critérios é preciso observar para identificar se ocorreu transformação?

U human ear is measured in?

Is the earth older than any of the rock layers.

Problem page liquid hexane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. what is the theoretical yield of water formed from the reaction of of hexane and of oxygen gas?

Calculate the mass percent of a NaCl solution in which 140g of NaCl is dissolved in 4.50L of water at 25C (density = 0.997g/mL).