At what cold-reservoir temperature (in ∘C) would a Carnot engine with a hot-reservoir temperature of 420 ∘C have an efficiency of 60 %?

After heating your beaker of Cu (OH) 2, you formed copper (II) oxide. Before you added the H2SO4, you were instructed to decant the supernatant, add warm water, and decant again. What was the purpose of this step

Exercise : For the pentapeptide Glu - met-Arg - Thr-Gly (a) Name the carboxyl - terminal residue (b) give the # of charged groups at pH7 (c, give the net charge at pH 1 id, draw the peptide bond between Thr & Gly

State whether the following statements are true or false. If false, explain why. (a) A reaction stops when equilibrium is reached. (b) An equilibrium reaction is not affected by increasing the concentrations of products.

What is a difference between a mixture of elements and a mixture of compounds

How is density related to buoyancy

A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm?

If 100 mL of a gas were enclosed in a buret at 500 mm Hg, what volume would the gas occupy at 1000 mm Hg at the same temperature? P1V1=P2V2

Would Mn (HPO4) 2 be manganese (II) monohydrogen phosphate?

The fundamental frequency of a violin string is 440 hz. the frequency of its second harmonic is

How much of a 15.0M stock solution do you need to prepare 250ml of a 2.35ml hf solution?