Tablet friendly web app that lets you browse elements; provides properties, data subsets, orbitals, isotopes, compound mixing, compound searching. Copyright by M. Dayah.
Contains practice tests for: credit by examination; core math, science, and english skills; civil service; ESL (Spanish) skills improvement courses; graduate school entrance; military; teacher certification; and US citizenship. Students must create a free account to take the practice tests.
Online practice tests including entrance exams, certification, and licensing tests. Also provides information on colleges and universities, scholarships, and resumes. List of tests and courses is available here.
A quick summary of how to use significant figures to communicate uncertainty in measurements and calculations. From a Chemistry Tutorial from Washington University in St. Louis.
(Special Publication 811) Includes links to the BIPM SI Brochure (9th edition), the NIST SP 330 2019 version, SP 811 in PDF format, and a poster of SI Base Units Relationships Poster.
Dr. Kennicutt is a professor at Texas A & M University. This site covers algebraic manipulation, dimensional analysis, significant figures, manipulation of exponents, scientific notation, logarithms, the quadratic equation, and standard deviation.
