Balance the equation and indicate whether it is a synthesis reaction, a decomposition reaction, a single-displacement reaction, a double-replacement reaction, or a combustion reaction.
KCN(aq)+H2SO4(aq) - K2SO4(aq)+HCN(g)

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Compare and contrast physical changes with chemical changes.

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.)