What have you learned about the phases of the moon? How many different phases are there? What are their names? Why does the moon sometimes change sizes and shapes? How can we use this information in our every day lives? 7 sentences please.

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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.)

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.