The sixth room you are transported to is on the second floor of the castle and it is composed of a silver-gray metallic solid . Taking a knife out of your backpack, you are able to cut a piece of it off because the substance if very soft. A portion of the element touches your hand, burning your skin. Filling a small glass beaker with water from your canteen, you drop the substance in to observe its reaction with water. It momentarily floats on the water before causing a small explosion. This element has 5 neutrons and an oxidation number of +2. What element is this? * Room 6

In 2002, the rare earth elements mine in mountain pass, california was closed because

If a solution had a ph of 7 what is the solution

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.)