1. In your own words, explain how the motion of the Sun, Earth and Moon periodically cause eclipses of the sun and moon. Include sketches (They may be hand drawn or you may use the paint program) that show the position of the Earth, Moon and Sun during a solar eclipse and a lunar eclipse. (30 points) 2. In your own words, explain the meaning of the terms umbra and penumbra. (30 points)
3. Identify A and B as either the umbra or the penumbra in the image below. Does this image show a solar or a lunar eclipse? (30 points)

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.)