Helium is considered a noble gas because it has a ___ valence electron shell.

Formula weight of H2CO3

a 9.56g sample of CuS is found to contain 6.35g of copper. What is the percent by mass of sulfur in this compound? Report your answer to the hundredths place

How does the arrangement of atoms in a mineral relate to its properties?

If the complete conversion of 1.383g of XI2 results in the formation of 0.564g of XCl2, what is the atomic mass of the element X

Acid rain is the direct result of acid released by burning fossil fuels. true or false

Which of the following is a mixture? alcohol water mercury ink

A gas occupies 3.5 L at standard pressure. Find the volume of the gas when the pressure is 1.5 atm.

What is the temperature (in K) of 16.45 moles of methane gas in a 4.95 L container at 4.68 atm?

What do we call the process by which cells obtain the energy that they need?

Which of the following statements describes how the periodic table is organized? 1. The elements are organized alphabetically. 2. The elements are organized by their size. 3. The elements are organized by the date they were discovered. 4.