This page accesses another that deals with chemical equations. We conduct research in order to improve the materials we provide.

Please provide your e-mail address. We do not knowingly reveal this information to anyone. Instead, we use it to track your entries. We may contact you by e-mail with a few questions. We have many hundreds of users, but we expect to contact just a few of them. This is no remuneration for our use of this data, nor will there be if we contact you.

If you want to use the tools but do not want to leave your real e-mail address, please make up a memorable fake e-mail address and use that address each time you log on.

We record all the Internet address of all users for security reasons.