A pan at 20 degrees * C is put on a stove burner until it reaches equilibrium at 80 degrees * C . Soon after the pan is put on the stove, a cube of butter at O^ C is dropped into it. On the axes , plot temperature versus time for the bottom of the pan and also for the center of the cube of butter

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

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 is the shape of the poem “peer” connected to its meaning?