Ineed ! can you tell me about the development of the periodic i have a dba in a few minutes and i don't ! use easy to understand answers 'cause i'm a little under the weather.

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

Label a-f based on the table using c for concentrated and d for dilute

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.)