How many grams are in 0.040 moles zirconium (Zr)? Only 2 significant number?

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles