Which examples represent chemical changes? Check all that apply.

burning wood

souring milk

melting copper to join two copper pipes together

browning of a cut apple

cutting a potato into small pieces

What is more likely to happen if wetlands are drained?

Shana, a student in the Analytical Chemistry class, performed a Redox Titration to determine the content of hypochlorite ions (% w/w) in an unknown solution. First, Shana prepared a primary standard solution of KIO3 by dissolving 0.

What is the magnitude of qsoot (in units of C) so that the electric force exerted on the particle is equal to its weight = mg?. Use: g = 10 m/s², and k = 9E9 N m²/C². How many electrons must be added to the soot particle?

Mass to moles: how many moles in 56g of carbon

Which of the following has 1.8 x 1024 hydrogen atoms

How does a tree speed up erosion? How can it slow erosion down?

In terms of electron configuration, why arsenic and antimony are chemically similar.

What does average speed mean

What are two types of chemical composition that characterize minerals?

Why is it important that the polymer membrane in a PEM fuel cell allows only protons to move through it? It forces the electrons to move through an external circuit, where they can do work.