Ph.D., Biomedical Sciences, University of Tennessee at Knoxville

B.A., Physics and Mathematics, Hastings College

Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.

You got: % Correct. Need More Practice With Conversions

You need more practice to master units, conversions, and significant figures. One way to learn the material is to work your way through the units and measurement study guide. You might also want to review how to cancel units. The best way to improve your skills is to practice working problems.

Good job! You missed a few questions, but with a bit more practice, you'll be converting units and working significant figure problems like a pro. A good way to review is to work your way through the units and measurement study guide.

You got: % Correct. Ready for Serious Conversion Calculations

Great work! You did well on the units and conversions quiz. If you have trouble with any specific types of problems, try looking at a worked example problem to review the concepts and see how to proceed. Remember to check your work to make sure an answer makes sense. You don't want to miss an answer from being careless!

Are you up for another quiz? See if you know all the answers in the 20 Questions chemistry quiz. If you'd like to try something completely different, see if you understand the science of how fireworks work.