( WORTH 25 POINTS SCIENCE)We have covered many aspects of biodiversity from what it is why it is important, and the risks that we face if we don't save it. Students will in the form of a quick write you will summarize the information that has been covered in this unit. In this summary, you will tell what biodiversity is in your own words. Do you think that it is important to save biodiversity why or why not? What is causing biodiversity to be at risk and what should be done to recover the ecosystem? This needs to be a minimum of 2 paragraphs. include any evidence needed to support your point of view where applicable.

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.)

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

If 22.5 of nitrogen at 748 mm hg are compressed to 725 mm hg at constant temperature. what is the new volume?