Water in a hot tub is maintained at 100.4 oF, and contains several solid solutes to keep it safe. What will happen if the temperature is permitted to fall significantly

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

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.)

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.