Apopular way in chemistry to demonstrate oxidation states is to show the color changes that occur as chromium is reduced. a. a solution of potassium dichromate is reduced to chromium(ll) ions by zinc metal in the presence of an acid causing the solution to change in color from orange to green. what is the oxidation state of the chromium in the potassium dichromate molecule? b. write the balanced half reactions and net ionic equations for this reaction. c. this green solution of chromium (ll) can be further reduced by zinc metal to a blue solution containing chromium(ll) ions. write the balanced half reactions and net ionic equation for this reduction

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet