Constructed Response 5. Zinc metal (Zn) reacts with hydrochloric acid
(HCl) to produce hydrogen gas (H2) and zinc
chloride (ZnCl2). A scientist has powdered zinc
and a chunk of zinc of equal mass. Available in
the lab are dilute HCl and concentrated HCl.
Which combination of zinc and acid would
react most quickly? Explain why the
combination you chose would make the
reaction occur most quickly.

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.