Calculate the ph of a cu-h2 cell (e° = 0.34 v) if the emf is 0.45 volts and the [cu2 is 0.50 m hint: first write the oxidation and reduction half-reactions and determine which direction is spontaneous. determine if 2- cu and h are on the product or the reactant side before you start calculating.

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of

How can you write e method for the experiment of separating sand from water by filtration process? 1-materials 2-steps 3-conclusion also the same for the separating process of water and salt by filtration or distillation. quick because i need to finish my hw