You heat up an unknown mass of copper to 150C and place it in 50g of water at 20C. The final temperature of the water is 23C. What is the mass of the copper? (Water's specific heat is 4.179 J/g C and copper's specific heat is 0.386 J/g C)

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

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

Chromosome 17 is made of over million base pairs.