First we need to deterine the extinction coefficient for the system at 710 and 740 nm. At the highest [HCl] the solution is essentially all [CoCl4]-2, the [Co(H2O)6]+2 can ignored. What is the extenction coefficient for 740 nm?

Describe the interaction that occurs between two objects with the same electrical charge.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.