Determine the specific heat of a material if a 12-g sample absorbed 96 J as it was heated from 20oC to 40oC?

What is the relation between concentration of reactants and the rate of chemical reaction?

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

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.)