In the experiment, you added water to the reaction vessel after the reaction was complete, but we did not discuss why. Based on what happened after adding the water, which of the following is the reason for the addition of water?
1. lower the solubility of the product in solution so it precipitated out2. increase the solubility of the product in solution so it precipitated out
3. lower the solubility of the product in solution so it stayed in solution
4. increase the solubility of the product in solution so it stayed in solution

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

What is the number of atoms in 3.54 mol s

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)