if you have a mixture of argon gas and helium gas that has a total pressure of 67 atm, and id we know that helium makes up 28% of the mixture, what will be the partial pressure of helium?

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3

The identities of substances are the same before and after which type of change