Which statement explains the process of a chemical reaction? a. substances are mixed together, producing a homogeneous mixture. b. reactants react to produce new substances known as products. c. substances are mixed together, producing a heterogeneous mixture. d. products combine to produce new reactants.

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.)

How do i turn 2 s into one in the products

Which part of the mantle is similar to the crust ? (science)