The students determined that a new substance formed and a chemical reaction took place. Which pieces of evidence from their observations best support this conclusion? Group of answer choices

substance dissolves, precipitate forms, color changes

color changes, temperature changes, precipitate forms

state change occurs, gas is released, substance dissolves

temperature changes, production of a gas, color changes

Adrop of acetone (nail polish remover) has a mass of 35 mg and a density of 0.788 g/cm3. what is its volume in cubic centimeters?

Identify a strong intermolecular force of attraction between an alcohol

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.)