Anne Helmenstine


Aqua Regia
Aqua regia is a highly corrosive mixture of hydrochloric acid (HCl) and nitric acid (HNO3) in a molar ratio of 3:1 or 4:1. The name “aqua regia” translates from Latin to mean “king’s water” or “royal water,” referring to the acid’s ability to dissolve the noble metals gold, platinum, and […]

Aqua Regia Definition and Preparation


An experiment includes many scientific method vocabulary terms. (chuttersnap)
The scientific method involves a hypothesis, variables, controls, experiments, and other concepts and terms that may be confusing. This is a glossary of key scientific method vocabulary terms and their definitions. Glossary of Scientific Method Words Anomaly: An anomaly is an observation that differs from expectation or from accepted scientific […]

Scientific Method Vocabulary Terms   Recently updated !




Real wasabi is green because of chlorophyll. Most "wasabi" is horseradish dyed with food coloring or spinach. (Jay Abrantes)
The spicy-hot green ball served with sushi is called wasabi, but unless you live in Japan, you’re almost certainly eating a substitute. This fake wasabi is made from horseradish, mustard, starch, and either green food coloring or spinach. You have to use the ingredient list rather than the product name […]

Why Is Wasabi Green?   Recently updated !


Review important chemistry facts before you take the AP chemistry exam. (Stephan Stefancik)
Before you take the AP Chemistry Exam (Advanced Placement Chemistry Exam), it’s helpful to review facts you need to know for the test. These facts are also helpful if you are studying for any other high school or college cumulative chemistry test. About the AP Chemistry Exam You don’t have […]

AP Chemistry Exam – Facts to Know   Recently updated !


Grams to Kilograms
Grams (g) and kilograms (kg) are the two most common units of mass in the metric system. It’s easy to convert grams to kilograms by cancelling units: Another way to convert g to kg is to simply move the decimal point three spaces to the left. So, for 1536 g […]

Grams to Kilograms Conversion Examples