A laboratory assistant was experimenting with chemical reactions when she combined a small amount of zinc (Zn) with hydrochloric acid (HCl). She discovered that zinc chloride (ZnCl2) [2 should be small and below the Cl] and hydrogen (H2) [2 should be small and below the H] were produced. Which of the following substances are the reactants? PLEASE PLEASE
A. Zn + HCl
B. ZnCl2 + H2
C. Zn + H2
D. ZnCl2 + HCl

What reaction is taking place? 02 + c3h8 = h20 + co2

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?