Use the Data Table below for Questions 4 and 5: 4.. A mixture contains 2 out of the 4 substances (A, B,C, D). the mixture dissolves in solution 1, fizzes
with solution 2, and turns dark blue in solution 3. The mixture is most likely a
combination of which 2 substances? A). A and B B). B and C C). C and D D).B and D

How many neutrons does a atom of cobalt have?

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

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.)